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[mirror_ubuntu-artful-kernel.git] / drivers / net / ethernet / octeon / octeon_mgmt.c
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2009 Cavium Networks
7 */
8
9 #include <linux/capability.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/interrupt.h>
14 #include <linux/platform_device.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/if.h>
18 #include <linux/if_vlan.h>
19 #include <linux/slab.h>
20 #include <linux/phy.h>
21 #include <linux/spinlock.h>
22
23 #include <asm/octeon/octeon.h>
24 #include <asm/octeon/cvmx-mixx-defs.h>
25 #include <asm/octeon/cvmx-agl-defs.h>
26
27 #define DRV_NAME "octeon_mgmt"
28 #define DRV_VERSION "2.0"
29 #define DRV_DESCRIPTION \
30 "Cavium Networks Octeon MII (management) port Network Driver"
31
32 #define OCTEON_MGMT_NAPI_WEIGHT 16
33
34 /*
35 * Ring sizes that are powers of two allow for more efficient modulo
36 * opertions.
37 */
38 #define OCTEON_MGMT_RX_RING_SIZE 512
39 #define OCTEON_MGMT_TX_RING_SIZE 128
40
41 /* Allow 8 bytes for vlan and FCS. */
42 #define OCTEON_MGMT_RX_HEADROOM (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN)
43
44 union mgmt_port_ring_entry {
45 u64 d64;
46 struct {
47 u64 reserved_62_63:2;
48 /* Length of the buffer/packet in bytes */
49 u64 len:14;
50 /* For TX, signals that the packet should be timestamped */
51 u64 tstamp:1;
52 /* The RX error code */
53 u64 code:7;
54 #define RING_ENTRY_CODE_DONE 0xf
55 #define RING_ENTRY_CODE_MORE 0x10
56 /* Physical address of the buffer */
57 u64 addr:40;
58 } s;
59 };
60
61 struct octeon_mgmt {
62 struct net_device *netdev;
63 int port;
64 int irq;
65 u64 *tx_ring;
66 dma_addr_t tx_ring_handle;
67 unsigned int tx_next;
68 unsigned int tx_next_clean;
69 unsigned int tx_current_fill;
70 /* The tx_list lock also protects the ring related variables */
71 struct sk_buff_head tx_list;
72
73 /* RX variables only touched in napi_poll. No locking necessary. */
74 u64 *rx_ring;
75 dma_addr_t rx_ring_handle;
76 unsigned int rx_next;
77 unsigned int rx_next_fill;
78 unsigned int rx_current_fill;
79 struct sk_buff_head rx_list;
80
81 spinlock_t lock;
82 unsigned int last_duplex;
83 unsigned int last_link;
84 struct device *dev;
85 struct napi_struct napi;
86 struct tasklet_struct tx_clean_tasklet;
87 struct phy_device *phydev;
88 };
89
90 static void octeon_mgmt_set_rx_irq(struct octeon_mgmt *p, int enable)
91 {
92 int port = p->port;
93 union cvmx_mixx_intena mix_intena;
94 unsigned long flags;
95
96 spin_lock_irqsave(&p->lock, flags);
97 mix_intena.u64 = cvmx_read_csr(CVMX_MIXX_INTENA(port));
98 mix_intena.s.ithena = enable ? 1 : 0;
99 cvmx_write_csr(CVMX_MIXX_INTENA(port), mix_intena.u64);
100 spin_unlock_irqrestore(&p->lock, flags);
101 }
102
103 static void octeon_mgmt_set_tx_irq(struct octeon_mgmt *p, int enable)
104 {
105 int port = p->port;
106 union cvmx_mixx_intena mix_intena;
107 unsigned long flags;
108
109 spin_lock_irqsave(&p->lock, flags);
110 mix_intena.u64 = cvmx_read_csr(CVMX_MIXX_INTENA(port));
111 mix_intena.s.othena = enable ? 1 : 0;
112 cvmx_write_csr(CVMX_MIXX_INTENA(port), mix_intena.u64);
113 spin_unlock_irqrestore(&p->lock, flags);
114 }
115
116 static inline void octeon_mgmt_enable_rx_irq(struct octeon_mgmt *p)
117 {
118 octeon_mgmt_set_rx_irq(p, 1);
119 }
120
121 static inline void octeon_mgmt_disable_rx_irq(struct octeon_mgmt *p)
122 {
123 octeon_mgmt_set_rx_irq(p, 0);
124 }
125
126 static inline void octeon_mgmt_enable_tx_irq(struct octeon_mgmt *p)
127 {
128 octeon_mgmt_set_tx_irq(p, 1);
129 }
130
131 static inline void octeon_mgmt_disable_tx_irq(struct octeon_mgmt *p)
132 {
133 octeon_mgmt_set_tx_irq(p, 0);
134 }
135
136 static unsigned int ring_max_fill(unsigned int ring_size)
137 {
138 return ring_size - 8;
139 }
140
141 static unsigned int ring_size_to_bytes(unsigned int ring_size)
142 {
143 return ring_size * sizeof(union mgmt_port_ring_entry);
144 }
145
146 static void octeon_mgmt_rx_fill_ring(struct net_device *netdev)
147 {
148 struct octeon_mgmt *p = netdev_priv(netdev);
149 int port = p->port;
150
151 while (p->rx_current_fill < ring_max_fill(OCTEON_MGMT_RX_RING_SIZE)) {
152 unsigned int size;
153 union mgmt_port_ring_entry re;
154 struct sk_buff *skb;
155
156 /* CN56XX pass 1 needs 8 bytes of padding. */
157 size = netdev->mtu + OCTEON_MGMT_RX_HEADROOM + 8 + NET_IP_ALIGN;
158
159 skb = netdev_alloc_skb(netdev, size);
160 if (!skb)
161 break;
162 skb_reserve(skb, NET_IP_ALIGN);
163 __skb_queue_tail(&p->rx_list, skb);
164
165 re.d64 = 0;
166 re.s.len = size;
167 re.s.addr = dma_map_single(p->dev, skb->data,
168 size,
169 DMA_FROM_DEVICE);
170
171 /* Put it in the ring. */
172 p->rx_ring[p->rx_next_fill] = re.d64;
173 dma_sync_single_for_device(p->dev, p->rx_ring_handle,
174 ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
175 DMA_BIDIRECTIONAL);
176 p->rx_next_fill =
177 (p->rx_next_fill + 1) % OCTEON_MGMT_RX_RING_SIZE;
178 p->rx_current_fill++;
179 /* Ring the bell. */
180 cvmx_write_csr(CVMX_MIXX_IRING2(port), 1);
181 }
182 }
183
184 static void octeon_mgmt_clean_tx_buffers(struct octeon_mgmt *p)
185 {
186 int port = p->port;
187 union cvmx_mixx_orcnt mix_orcnt;
188 union mgmt_port_ring_entry re;
189 struct sk_buff *skb;
190 int cleaned = 0;
191 unsigned long flags;
192
193 mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
194 while (mix_orcnt.s.orcnt) {
195 spin_lock_irqsave(&p->tx_list.lock, flags);
196
197 mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
198
199 if (mix_orcnt.s.orcnt == 0) {
200 spin_unlock_irqrestore(&p->tx_list.lock, flags);
201 break;
202 }
203
204 dma_sync_single_for_cpu(p->dev, p->tx_ring_handle,
205 ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
206 DMA_BIDIRECTIONAL);
207
208 re.d64 = p->tx_ring[p->tx_next_clean];
209 p->tx_next_clean =
210 (p->tx_next_clean + 1) % OCTEON_MGMT_TX_RING_SIZE;
211 skb = __skb_dequeue(&p->tx_list);
212
213 mix_orcnt.u64 = 0;
214 mix_orcnt.s.orcnt = 1;
215
216 /* Acknowledge to hardware that we have the buffer. */
217 cvmx_write_csr(CVMX_MIXX_ORCNT(port), mix_orcnt.u64);
218 p->tx_current_fill--;
219
220 spin_unlock_irqrestore(&p->tx_list.lock, flags);
221
222 dma_unmap_single(p->dev, re.s.addr, re.s.len,
223 DMA_TO_DEVICE);
224 dev_kfree_skb_any(skb);
225 cleaned++;
226
227 mix_orcnt.u64 = cvmx_read_csr(CVMX_MIXX_ORCNT(port));
228 }
229
230 if (cleaned && netif_queue_stopped(p->netdev))
231 netif_wake_queue(p->netdev);
232 }
233
234 static void octeon_mgmt_clean_tx_tasklet(unsigned long arg)
235 {
236 struct octeon_mgmt *p = (struct octeon_mgmt *)arg;
237 octeon_mgmt_clean_tx_buffers(p);
238 octeon_mgmt_enable_tx_irq(p);
239 }
240
241 static void octeon_mgmt_update_rx_stats(struct net_device *netdev)
242 {
243 struct octeon_mgmt *p = netdev_priv(netdev);
244 int port = p->port;
245 unsigned long flags;
246 u64 drop, bad;
247
248 /* These reads also clear the count registers. */
249 drop = cvmx_read_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_DRP(port));
250 bad = cvmx_read_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_BAD(port));
251
252 if (drop || bad) {
253 /* Do an atomic update. */
254 spin_lock_irqsave(&p->lock, flags);
255 netdev->stats.rx_errors += bad;
256 netdev->stats.rx_dropped += drop;
257 spin_unlock_irqrestore(&p->lock, flags);
258 }
259 }
260
261 static void octeon_mgmt_update_tx_stats(struct net_device *netdev)
262 {
263 struct octeon_mgmt *p = netdev_priv(netdev);
264 int port = p->port;
265 unsigned long flags;
266
267 union cvmx_agl_gmx_txx_stat0 s0;
268 union cvmx_agl_gmx_txx_stat1 s1;
269
270 /* These reads also clear the count registers. */
271 s0.u64 = cvmx_read_csr(CVMX_AGL_GMX_TXX_STAT0(port));
272 s1.u64 = cvmx_read_csr(CVMX_AGL_GMX_TXX_STAT1(port));
273
274 if (s0.s.xsdef || s0.s.xscol || s1.s.scol || s1.s.mcol) {
275 /* Do an atomic update. */
276 spin_lock_irqsave(&p->lock, flags);
277 netdev->stats.tx_errors += s0.s.xsdef + s0.s.xscol;
278 netdev->stats.collisions += s1.s.scol + s1.s.mcol;
279 spin_unlock_irqrestore(&p->lock, flags);
280 }
281 }
282
283 /*
284 * Dequeue a receive skb and its corresponding ring entry. The ring
285 * entry is returned, *pskb is updated to point to the skb.
286 */
287 static u64 octeon_mgmt_dequeue_rx_buffer(struct octeon_mgmt *p,
288 struct sk_buff **pskb)
289 {
290 union mgmt_port_ring_entry re;
291
292 dma_sync_single_for_cpu(p->dev, p->rx_ring_handle,
293 ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
294 DMA_BIDIRECTIONAL);
295
296 re.d64 = p->rx_ring[p->rx_next];
297 p->rx_next = (p->rx_next + 1) % OCTEON_MGMT_RX_RING_SIZE;
298 p->rx_current_fill--;
299 *pskb = __skb_dequeue(&p->rx_list);
300
301 dma_unmap_single(p->dev, re.s.addr,
302 ETH_FRAME_LEN + OCTEON_MGMT_RX_HEADROOM,
303 DMA_FROM_DEVICE);
304
305 return re.d64;
306 }
307
308
309 static int octeon_mgmt_receive_one(struct octeon_mgmt *p)
310 {
311 int port = p->port;
312 struct net_device *netdev = p->netdev;
313 union cvmx_mixx_ircnt mix_ircnt;
314 union mgmt_port_ring_entry re;
315 struct sk_buff *skb;
316 struct sk_buff *skb2;
317 struct sk_buff *skb_new;
318 union mgmt_port_ring_entry re2;
319 int rc = 1;
320
321
322 re.d64 = octeon_mgmt_dequeue_rx_buffer(p, &skb);
323 if (likely(re.s.code == RING_ENTRY_CODE_DONE)) {
324 /* A good packet, send it up. */
325 skb_put(skb, re.s.len);
326 good:
327 skb->protocol = eth_type_trans(skb, netdev);
328 netdev->stats.rx_packets++;
329 netdev->stats.rx_bytes += skb->len;
330 netif_receive_skb(skb);
331 rc = 0;
332 } else if (re.s.code == RING_ENTRY_CODE_MORE) {
333 /*
334 * Packet split across skbs. This can happen if we
335 * increase the MTU. Buffers that are already in the
336 * rx ring can then end up being too small. As the rx
337 * ring is refilled, buffers sized for the new MTU
338 * will be used and we should go back to the normal
339 * non-split case.
340 */
341 skb_put(skb, re.s.len);
342 do {
343 re2.d64 = octeon_mgmt_dequeue_rx_buffer(p, &skb2);
344 if (re2.s.code != RING_ENTRY_CODE_MORE
345 && re2.s.code != RING_ENTRY_CODE_DONE)
346 goto split_error;
347 skb_put(skb2, re2.s.len);
348 skb_new = skb_copy_expand(skb, 0, skb2->len,
349 GFP_ATOMIC);
350 if (!skb_new)
351 goto split_error;
352 if (skb_copy_bits(skb2, 0, skb_tail_pointer(skb_new),
353 skb2->len))
354 goto split_error;
355 skb_put(skb_new, skb2->len);
356 dev_kfree_skb_any(skb);
357 dev_kfree_skb_any(skb2);
358 skb = skb_new;
359 } while (re2.s.code == RING_ENTRY_CODE_MORE);
360 goto good;
361 } else {
362 /* Some other error, discard it. */
363 dev_kfree_skb_any(skb);
364 /*
365 * Error statistics are accumulated in
366 * octeon_mgmt_update_rx_stats.
367 */
368 }
369 goto done;
370 split_error:
371 /* Discard the whole mess. */
372 dev_kfree_skb_any(skb);
373 dev_kfree_skb_any(skb2);
374 while (re2.s.code == RING_ENTRY_CODE_MORE) {
375 re2.d64 = octeon_mgmt_dequeue_rx_buffer(p, &skb2);
376 dev_kfree_skb_any(skb2);
377 }
378 netdev->stats.rx_errors++;
379
380 done:
381 /* Tell the hardware we processed a packet. */
382 mix_ircnt.u64 = 0;
383 mix_ircnt.s.ircnt = 1;
384 cvmx_write_csr(CVMX_MIXX_IRCNT(port), mix_ircnt.u64);
385 return rc;
386 }
387
388 static int octeon_mgmt_receive_packets(struct octeon_mgmt *p, int budget)
389 {
390 int port = p->port;
391 unsigned int work_done = 0;
392 union cvmx_mixx_ircnt mix_ircnt;
393 int rc;
394
395 mix_ircnt.u64 = cvmx_read_csr(CVMX_MIXX_IRCNT(port));
396 while (work_done < budget && mix_ircnt.s.ircnt) {
397
398 rc = octeon_mgmt_receive_one(p);
399 if (!rc)
400 work_done++;
401
402 /* Check for more packets. */
403 mix_ircnt.u64 = cvmx_read_csr(CVMX_MIXX_IRCNT(port));
404 }
405
406 octeon_mgmt_rx_fill_ring(p->netdev);
407
408 return work_done;
409 }
410
411 static int octeon_mgmt_napi_poll(struct napi_struct *napi, int budget)
412 {
413 struct octeon_mgmt *p = container_of(napi, struct octeon_mgmt, napi);
414 struct net_device *netdev = p->netdev;
415 unsigned int work_done = 0;
416
417 work_done = octeon_mgmt_receive_packets(p, budget);
418
419 if (work_done < budget) {
420 /* We stopped because no more packets were available. */
421 napi_complete(napi);
422 octeon_mgmt_enable_rx_irq(p);
423 }
424 octeon_mgmt_update_rx_stats(netdev);
425
426 return work_done;
427 }
428
429 /* Reset the hardware to clean state. */
430 static void octeon_mgmt_reset_hw(struct octeon_mgmt *p)
431 {
432 union cvmx_mixx_ctl mix_ctl;
433 union cvmx_mixx_bist mix_bist;
434 union cvmx_agl_gmx_bist agl_gmx_bist;
435
436 mix_ctl.u64 = 0;
437 cvmx_write_csr(CVMX_MIXX_CTL(p->port), mix_ctl.u64);
438 do {
439 mix_ctl.u64 = cvmx_read_csr(CVMX_MIXX_CTL(p->port));
440 } while (mix_ctl.s.busy);
441 mix_ctl.s.reset = 1;
442 cvmx_write_csr(CVMX_MIXX_CTL(p->port), mix_ctl.u64);
443 cvmx_read_csr(CVMX_MIXX_CTL(p->port));
444 cvmx_wait(64);
445
446 mix_bist.u64 = cvmx_read_csr(CVMX_MIXX_BIST(p->port));
447 if (mix_bist.u64)
448 dev_warn(p->dev, "MIX failed BIST (0x%016llx)\n",
449 (unsigned long long)mix_bist.u64);
450
451 agl_gmx_bist.u64 = cvmx_read_csr(CVMX_AGL_GMX_BIST);
452 if (agl_gmx_bist.u64)
453 dev_warn(p->dev, "AGL failed BIST (0x%016llx)\n",
454 (unsigned long long)agl_gmx_bist.u64);
455 }
456
457 struct octeon_mgmt_cam_state {
458 u64 cam[6];
459 u64 cam_mask;
460 int cam_index;
461 };
462
463 static void octeon_mgmt_cam_state_add(struct octeon_mgmt_cam_state *cs,
464 unsigned char *addr)
465 {
466 int i;
467
468 for (i = 0; i < 6; i++)
469 cs->cam[i] |= (u64)addr[i] << (8 * (cs->cam_index));
470 cs->cam_mask |= (1ULL << cs->cam_index);
471 cs->cam_index++;
472 }
473
474 static void octeon_mgmt_set_rx_filtering(struct net_device *netdev)
475 {
476 struct octeon_mgmt *p = netdev_priv(netdev);
477 int port = p->port;
478 union cvmx_agl_gmx_rxx_adr_ctl adr_ctl;
479 union cvmx_agl_gmx_prtx_cfg agl_gmx_prtx;
480 unsigned long flags;
481 unsigned int prev_packet_enable;
482 unsigned int cam_mode = 1; /* 1 - Accept on CAM match */
483 unsigned int multicast_mode = 1; /* 1 - Reject all multicast. */
484 struct octeon_mgmt_cam_state cam_state;
485 struct netdev_hw_addr *ha;
486 int available_cam_entries;
487
488 memset(&cam_state, 0, sizeof(cam_state));
489
490 if ((netdev->flags & IFF_PROMISC) || netdev->uc.count > 7) {
491 cam_mode = 0;
492 available_cam_entries = 8;
493 } else {
494 /*
495 * One CAM entry for the primary address, leaves seven
496 * for the secondary addresses.
497 */
498 available_cam_entries = 7 - netdev->uc.count;
499 }
500
501 if (netdev->flags & IFF_MULTICAST) {
502 if (cam_mode == 0 || (netdev->flags & IFF_ALLMULTI) ||
503 netdev_mc_count(netdev) > available_cam_entries)
504 multicast_mode = 2; /* 2 - Accept all multicast. */
505 else
506 multicast_mode = 0; /* 0 - Use CAM. */
507 }
508
509 if (cam_mode == 1) {
510 /* Add primary address. */
511 octeon_mgmt_cam_state_add(&cam_state, netdev->dev_addr);
512 netdev_for_each_uc_addr(ha, netdev)
513 octeon_mgmt_cam_state_add(&cam_state, ha->addr);
514 }
515 if (multicast_mode == 0) {
516 netdev_for_each_mc_addr(ha, netdev)
517 octeon_mgmt_cam_state_add(&cam_state, ha->addr);
518 }
519
520 spin_lock_irqsave(&p->lock, flags);
521
522 /* Disable packet I/O. */
523 agl_gmx_prtx.u64 = cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
524 prev_packet_enable = agl_gmx_prtx.s.en;
525 agl_gmx_prtx.s.en = 0;
526 cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
527
528 adr_ctl.u64 = 0;
529 adr_ctl.s.cam_mode = cam_mode;
530 adr_ctl.s.mcst = multicast_mode;
531 adr_ctl.s.bcst = 1; /* Allow broadcast */
532
533 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CTL(port), adr_ctl.u64);
534
535 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM0(port), cam_state.cam[0]);
536 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM1(port), cam_state.cam[1]);
537 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM2(port), cam_state.cam[2]);
538 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM3(port), cam_state.cam[3]);
539 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM4(port), cam_state.cam[4]);
540 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM5(port), cam_state.cam[5]);
541 cvmx_write_csr(CVMX_AGL_GMX_RXX_ADR_CAM_EN(port), cam_state.cam_mask);
542
543 /* Restore packet I/O. */
544 agl_gmx_prtx.s.en = prev_packet_enable;
545 cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), agl_gmx_prtx.u64);
546
547 spin_unlock_irqrestore(&p->lock, flags);
548 }
549
550 static int octeon_mgmt_set_mac_address(struct net_device *netdev, void *addr)
551 {
552 struct sockaddr *sa = addr;
553
554 if (!is_valid_ether_addr(sa->sa_data))
555 return -EADDRNOTAVAIL;
556
557 memcpy(netdev->dev_addr, sa->sa_data, ETH_ALEN);
558
559 octeon_mgmt_set_rx_filtering(netdev);
560
561 return 0;
562 }
563
564 static int octeon_mgmt_change_mtu(struct net_device *netdev, int new_mtu)
565 {
566 struct octeon_mgmt *p = netdev_priv(netdev);
567 int port = p->port;
568 int size_without_fcs = new_mtu + OCTEON_MGMT_RX_HEADROOM;
569
570 /*
571 * Limit the MTU to make sure the ethernet packets are between
572 * 64 bytes and 16383 bytes.
573 */
574 if (size_without_fcs < 64 || size_without_fcs > 16383) {
575 dev_warn(p->dev, "MTU must be between %d and %d.\n",
576 64 - OCTEON_MGMT_RX_HEADROOM,
577 16383 - OCTEON_MGMT_RX_HEADROOM);
578 return -EINVAL;
579 }
580
581 netdev->mtu = new_mtu;
582
583 cvmx_write_csr(CVMX_AGL_GMX_RXX_FRM_MAX(port), size_without_fcs);
584 cvmx_write_csr(CVMX_AGL_GMX_RXX_JABBER(port),
585 (size_without_fcs + 7) & 0xfff8);
586
587 return 0;
588 }
589
590 static irqreturn_t octeon_mgmt_interrupt(int cpl, void *dev_id)
591 {
592 struct net_device *netdev = dev_id;
593 struct octeon_mgmt *p = netdev_priv(netdev);
594 int port = p->port;
595 union cvmx_mixx_isr mixx_isr;
596
597 mixx_isr.u64 = cvmx_read_csr(CVMX_MIXX_ISR(port));
598
599 /* Clear any pending interrupts */
600 cvmx_write_csr(CVMX_MIXX_ISR(port), mixx_isr.u64);
601 cvmx_read_csr(CVMX_MIXX_ISR(port));
602
603 if (mixx_isr.s.irthresh) {
604 octeon_mgmt_disable_rx_irq(p);
605 napi_schedule(&p->napi);
606 }
607 if (mixx_isr.s.orthresh) {
608 octeon_mgmt_disable_tx_irq(p);
609 tasklet_schedule(&p->tx_clean_tasklet);
610 }
611
612 return IRQ_HANDLED;
613 }
614
615 static int octeon_mgmt_ioctl(struct net_device *netdev,
616 struct ifreq *rq, int cmd)
617 {
618 struct octeon_mgmt *p = netdev_priv(netdev);
619
620 if (!netif_running(netdev))
621 return -EINVAL;
622
623 if (!p->phydev)
624 return -EINVAL;
625
626 return phy_mii_ioctl(p->phydev, rq, cmd);
627 }
628
629 static void octeon_mgmt_adjust_link(struct net_device *netdev)
630 {
631 struct octeon_mgmt *p = netdev_priv(netdev);
632 int port = p->port;
633 union cvmx_agl_gmx_prtx_cfg prtx_cfg;
634 unsigned long flags;
635 int link_changed = 0;
636
637 spin_lock_irqsave(&p->lock, flags);
638 if (p->phydev->link) {
639 if (!p->last_link)
640 link_changed = 1;
641 if (p->last_duplex != p->phydev->duplex) {
642 p->last_duplex = p->phydev->duplex;
643 prtx_cfg.u64 =
644 cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
645 prtx_cfg.s.duplex = p->phydev->duplex;
646 cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port),
647 prtx_cfg.u64);
648 }
649 } else {
650 if (p->last_link)
651 link_changed = -1;
652 }
653 p->last_link = p->phydev->link;
654 spin_unlock_irqrestore(&p->lock, flags);
655
656 if (link_changed != 0) {
657 if (link_changed > 0) {
658 netif_carrier_on(netdev);
659 pr_info("%s: Link is up - %d/%s\n", netdev->name,
660 p->phydev->speed,
661 DUPLEX_FULL == p->phydev->duplex ?
662 "Full" : "Half");
663 } else {
664 netif_carrier_off(netdev);
665 pr_info("%s: Link is down\n", netdev->name);
666 }
667 }
668 }
669
670 static int octeon_mgmt_init_phy(struct net_device *netdev)
671 {
672 struct octeon_mgmt *p = netdev_priv(netdev);
673 char phy_id[20];
674
675 if (octeon_is_simulation()) {
676 /* No PHYs in the simulator. */
677 netif_carrier_on(netdev);
678 return 0;
679 }
680
681 snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT, "0", p->port);
682
683 p->phydev = phy_connect(netdev, phy_id, octeon_mgmt_adjust_link, 0,
684 PHY_INTERFACE_MODE_MII);
685
686 if (IS_ERR(p->phydev)) {
687 p->phydev = NULL;
688 return -1;
689 }
690
691 phy_start_aneg(p->phydev);
692
693 return 0;
694 }
695
696 static int octeon_mgmt_open(struct net_device *netdev)
697 {
698 struct octeon_mgmt *p = netdev_priv(netdev);
699 int port = p->port;
700 union cvmx_mixx_ctl mix_ctl;
701 union cvmx_agl_gmx_inf_mode agl_gmx_inf_mode;
702 union cvmx_mixx_oring1 oring1;
703 union cvmx_mixx_iring1 iring1;
704 union cvmx_agl_gmx_prtx_cfg prtx_cfg;
705 union cvmx_agl_gmx_rxx_frm_ctl rxx_frm_ctl;
706 union cvmx_mixx_irhwm mix_irhwm;
707 union cvmx_mixx_orhwm mix_orhwm;
708 union cvmx_mixx_intena mix_intena;
709 struct sockaddr sa;
710
711 /* Allocate ring buffers. */
712 p->tx_ring = kzalloc(ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
713 GFP_KERNEL);
714 if (!p->tx_ring)
715 return -ENOMEM;
716 p->tx_ring_handle =
717 dma_map_single(p->dev, p->tx_ring,
718 ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
719 DMA_BIDIRECTIONAL);
720 p->tx_next = 0;
721 p->tx_next_clean = 0;
722 p->tx_current_fill = 0;
723
724
725 p->rx_ring = kzalloc(ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
726 GFP_KERNEL);
727 if (!p->rx_ring)
728 goto err_nomem;
729 p->rx_ring_handle =
730 dma_map_single(p->dev, p->rx_ring,
731 ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
732 DMA_BIDIRECTIONAL);
733
734 p->rx_next = 0;
735 p->rx_next_fill = 0;
736 p->rx_current_fill = 0;
737
738 octeon_mgmt_reset_hw(p);
739
740 mix_ctl.u64 = cvmx_read_csr(CVMX_MIXX_CTL(port));
741
742 /* Bring it out of reset if needed. */
743 if (mix_ctl.s.reset) {
744 mix_ctl.s.reset = 0;
745 cvmx_write_csr(CVMX_MIXX_CTL(port), mix_ctl.u64);
746 do {
747 mix_ctl.u64 = cvmx_read_csr(CVMX_MIXX_CTL(port));
748 } while (mix_ctl.s.reset);
749 }
750
751 agl_gmx_inf_mode.u64 = 0;
752 agl_gmx_inf_mode.s.en = 1;
753 cvmx_write_csr(CVMX_AGL_GMX_INF_MODE, agl_gmx_inf_mode.u64);
754
755 oring1.u64 = 0;
756 oring1.s.obase = p->tx_ring_handle >> 3;
757 oring1.s.osize = OCTEON_MGMT_TX_RING_SIZE;
758 cvmx_write_csr(CVMX_MIXX_ORING1(port), oring1.u64);
759
760 iring1.u64 = 0;
761 iring1.s.ibase = p->rx_ring_handle >> 3;
762 iring1.s.isize = OCTEON_MGMT_RX_RING_SIZE;
763 cvmx_write_csr(CVMX_MIXX_IRING1(port), iring1.u64);
764
765 /* Disable packet I/O. */
766 prtx_cfg.u64 = cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
767 prtx_cfg.s.en = 0;
768 cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), prtx_cfg.u64);
769
770 memcpy(sa.sa_data, netdev->dev_addr, ETH_ALEN);
771 octeon_mgmt_set_mac_address(netdev, &sa);
772
773 octeon_mgmt_change_mtu(netdev, netdev->mtu);
774
775 /*
776 * Enable the port HW. Packets are not allowed until
777 * cvmx_mgmt_port_enable() is called.
778 */
779 mix_ctl.u64 = 0;
780 mix_ctl.s.crc_strip = 1; /* Strip the ending CRC */
781 mix_ctl.s.en = 1; /* Enable the port */
782 mix_ctl.s.nbtarb = 0; /* Arbitration mode */
783 /* MII CB-request FIFO programmable high watermark */
784 mix_ctl.s.mrq_hwm = 1;
785 cvmx_write_csr(CVMX_MIXX_CTL(port), mix_ctl.u64);
786
787 if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)
788 || OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
789 /*
790 * Force compensation values, as they are not
791 * determined properly by HW
792 */
793 union cvmx_agl_gmx_drv_ctl drv_ctl;
794
795 drv_ctl.u64 = cvmx_read_csr(CVMX_AGL_GMX_DRV_CTL);
796 if (port) {
797 drv_ctl.s.byp_en1 = 1;
798 drv_ctl.s.nctl1 = 6;
799 drv_ctl.s.pctl1 = 6;
800 } else {
801 drv_ctl.s.byp_en = 1;
802 drv_ctl.s.nctl = 6;
803 drv_ctl.s.pctl = 6;
804 }
805 cvmx_write_csr(CVMX_AGL_GMX_DRV_CTL, drv_ctl.u64);
806 }
807
808 octeon_mgmt_rx_fill_ring(netdev);
809
810 /* Clear statistics. */
811 /* Clear on read. */
812 cvmx_write_csr(CVMX_AGL_GMX_RXX_STATS_CTL(port), 1);
813 cvmx_write_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_DRP(port), 0);
814 cvmx_write_csr(CVMX_AGL_GMX_RXX_STATS_PKTS_BAD(port), 0);
815
816 cvmx_write_csr(CVMX_AGL_GMX_TXX_STATS_CTL(port), 1);
817 cvmx_write_csr(CVMX_AGL_GMX_TXX_STAT0(port), 0);
818 cvmx_write_csr(CVMX_AGL_GMX_TXX_STAT1(port), 0);
819
820 /* Clear any pending interrupts */
821 cvmx_write_csr(CVMX_MIXX_ISR(port), cvmx_read_csr(CVMX_MIXX_ISR(port)));
822
823 if (request_irq(p->irq, octeon_mgmt_interrupt, 0, netdev->name,
824 netdev)) {
825 dev_err(p->dev, "request_irq(%d) failed.\n", p->irq);
826 goto err_noirq;
827 }
828
829 /* Interrupt every single RX packet */
830 mix_irhwm.u64 = 0;
831 mix_irhwm.s.irhwm = 0;
832 cvmx_write_csr(CVMX_MIXX_IRHWM(port), mix_irhwm.u64);
833
834 /* Interrupt when we have 1 or more packets to clean. */
835 mix_orhwm.u64 = 0;
836 mix_orhwm.s.orhwm = 1;
837 cvmx_write_csr(CVMX_MIXX_ORHWM(port), mix_orhwm.u64);
838
839 /* Enable receive and transmit interrupts */
840 mix_intena.u64 = 0;
841 mix_intena.s.ithena = 1;
842 mix_intena.s.othena = 1;
843 cvmx_write_csr(CVMX_MIXX_INTENA(port), mix_intena.u64);
844
845
846 /* Enable packet I/O. */
847
848 rxx_frm_ctl.u64 = 0;
849 rxx_frm_ctl.s.pre_align = 1;
850 /*
851 * When set, disables the length check for non-min sized pkts
852 * with padding in the client data.
853 */
854 rxx_frm_ctl.s.pad_len = 1;
855 /* When set, disables the length check for VLAN pkts */
856 rxx_frm_ctl.s.vlan_len = 1;
857 /* When set, PREAMBLE checking is less strict */
858 rxx_frm_ctl.s.pre_free = 1;
859 /* Control Pause Frames can match station SMAC */
860 rxx_frm_ctl.s.ctl_smac = 0;
861 /* Control Pause Frames can match globally assign Multicast address */
862 rxx_frm_ctl.s.ctl_mcst = 1;
863 /* Forward pause information to TX block */
864 rxx_frm_ctl.s.ctl_bck = 1;
865 /* Drop Control Pause Frames */
866 rxx_frm_ctl.s.ctl_drp = 1;
867 /* Strip off the preamble */
868 rxx_frm_ctl.s.pre_strp = 1;
869 /*
870 * This port is configured to send PREAMBLE+SFD to begin every
871 * frame. GMX checks that the PREAMBLE is sent correctly.
872 */
873 rxx_frm_ctl.s.pre_chk = 1;
874 cvmx_write_csr(CVMX_AGL_GMX_RXX_FRM_CTL(port), rxx_frm_ctl.u64);
875
876 /* Enable the AGL block */
877 agl_gmx_inf_mode.u64 = 0;
878 agl_gmx_inf_mode.s.en = 1;
879 cvmx_write_csr(CVMX_AGL_GMX_INF_MODE, agl_gmx_inf_mode.u64);
880
881 /* Configure the port duplex and enables */
882 prtx_cfg.u64 = cvmx_read_csr(CVMX_AGL_GMX_PRTX_CFG(port));
883 prtx_cfg.s.tx_en = 1;
884 prtx_cfg.s.rx_en = 1;
885 prtx_cfg.s.en = 1;
886 p->last_duplex = 1;
887 prtx_cfg.s.duplex = p->last_duplex;
888 cvmx_write_csr(CVMX_AGL_GMX_PRTX_CFG(port), prtx_cfg.u64);
889
890 p->last_link = 0;
891 netif_carrier_off(netdev);
892
893 if (octeon_mgmt_init_phy(netdev)) {
894 dev_err(p->dev, "Cannot initialize PHY.\n");
895 goto err_noirq;
896 }
897
898 netif_wake_queue(netdev);
899 napi_enable(&p->napi);
900
901 return 0;
902 err_noirq:
903 octeon_mgmt_reset_hw(p);
904 dma_unmap_single(p->dev, p->rx_ring_handle,
905 ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
906 DMA_BIDIRECTIONAL);
907 kfree(p->rx_ring);
908 err_nomem:
909 dma_unmap_single(p->dev, p->tx_ring_handle,
910 ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
911 DMA_BIDIRECTIONAL);
912 kfree(p->tx_ring);
913 return -ENOMEM;
914 }
915
916 static int octeon_mgmt_stop(struct net_device *netdev)
917 {
918 struct octeon_mgmt *p = netdev_priv(netdev);
919
920 napi_disable(&p->napi);
921 netif_stop_queue(netdev);
922
923 if (p->phydev)
924 phy_disconnect(p->phydev);
925
926 netif_carrier_off(netdev);
927
928 octeon_mgmt_reset_hw(p);
929
930 free_irq(p->irq, netdev);
931
932 /* dma_unmap is a nop on Octeon, so just free everything. */
933 skb_queue_purge(&p->tx_list);
934 skb_queue_purge(&p->rx_list);
935
936 dma_unmap_single(p->dev, p->rx_ring_handle,
937 ring_size_to_bytes(OCTEON_MGMT_RX_RING_SIZE),
938 DMA_BIDIRECTIONAL);
939 kfree(p->rx_ring);
940
941 dma_unmap_single(p->dev, p->tx_ring_handle,
942 ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
943 DMA_BIDIRECTIONAL);
944 kfree(p->tx_ring);
945
946 return 0;
947 }
948
949 static int octeon_mgmt_xmit(struct sk_buff *skb, struct net_device *netdev)
950 {
951 struct octeon_mgmt *p = netdev_priv(netdev);
952 int port = p->port;
953 union mgmt_port_ring_entry re;
954 unsigned long flags;
955 int rv = NETDEV_TX_BUSY;
956
957 re.d64 = 0;
958 re.s.len = skb->len;
959 re.s.addr = dma_map_single(p->dev, skb->data,
960 skb->len,
961 DMA_TO_DEVICE);
962
963 spin_lock_irqsave(&p->tx_list.lock, flags);
964
965 if (unlikely(p->tx_current_fill >= ring_max_fill(OCTEON_MGMT_TX_RING_SIZE) - 1)) {
966 spin_unlock_irqrestore(&p->tx_list.lock, flags);
967 netif_stop_queue(netdev);
968 spin_lock_irqsave(&p->tx_list.lock, flags);
969 }
970
971 if (unlikely(p->tx_current_fill >=
972 ring_max_fill(OCTEON_MGMT_TX_RING_SIZE))) {
973 spin_unlock_irqrestore(&p->tx_list.lock, flags);
974 dma_unmap_single(p->dev, re.s.addr, re.s.len,
975 DMA_TO_DEVICE);
976 goto out;
977 }
978
979 __skb_queue_tail(&p->tx_list, skb);
980
981 /* Put it in the ring. */
982 p->tx_ring[p->tx_next] = re.d64;
983 p->tx_next = (p->tx_next + 1) % OCTEON_MGMT_TX_RING_SIZE;
984 p->tx_current_fill++;
985
986 spin_unlock_irqrestore(&p->tx_list.lock, flags);
987
988 dma_sync_single_for_device(p->dev, p->tx_ring_handle,
989 ring_size_to_bytes(OCTEON_MGMT_TX_RING_SIZE),
990 DMA_BIDIRECTIONAL);
991
992 netdev->stats.tx_packets++;
993 netdev->stats.tx_bytes += skb->len;
994
995 /* Ring the bell. */
996 cvmx_write_csr(CVMX_MIXX_ORING2(port), 1);
997
998 rv = NETDEV_TX_OK;
999 out:
1000 octeon_mgmt_update_tx_stats(netdev);
1001 return rv;
1002 }
1003
1004 #ifdef CONFIG_NET_POLL_CONTROLLER
1005 static void octeon_mgmt_poll_controller(struct net_device *netdev)
1006 {
1007 struct octeon_mgmt *p = netdev_priv(netdev);
1008
1009 octeon_mgmt_receive_packets(p, 16);
1010 octeon_mgmt_update_rx_stats(netdev);
1011 }
1012 #endif
1013
1014 static void octeon_mgmt_get_drvinfo(struct net_device *netdev,
1015 struct ethtool_drvinfo *info)
1016 {
1017 strncpy(info->driver, DRV_NAME, sizeof(info->driver));
1018 strncpy(info->version, DRV_VERSION, sizeof(info->version));
1019 strncpy(info->fw_version, "N/A", sizeof(info->fw_version));
1020 strncpy(info->bus_info, "N/A", sizeof(info->bus_info));
1021 info->n_stats = 0;
1022 info->testinfo_len = 0;
1023 info->regdump_len = 0;
1024 info->eedump_len = 0;
1025 }
1026
1027 static int octeon_mgmt_get_settings(struct net_device *netdev,
1028 struct ethtool_cmd *cmd)
1029 {
1030 struct octeon_mgmt *p = netdev_priv(netdev);
1031
1032 if (p->phydev)
1033 return phy_ethtool_gset(p->phydev, cmd);
1034
1035 return -EINVAL;
1036 }
1037
1038 static int octeon_mgmt_set_settings(struct net_device *netdev,
1039 struct ethtool_cmd *cmd)
1040 {
1041 struct octeon_mgmt *p = netdev_priv(netdev);
1042
1043 if (!capable(CAP_NET_ADMIN))
1044 return -EPERM;
1045
1046 if (p->phydev)
1047 return phy_ethtool_sset(p->phydev, cmd);
1048
1049 return -EINVAL;
1050 }
1051
1052 static const struct ethtool_ops octeon_mgmt_ethtool_ops = {
1053 .get_drvinfo = octeon_mgmt_get_drvinfo,
1054 .get_link = ethtool_op_get_link,
1055 .get_settings = octeon_mgmt_get_settings,
1056 .set_settings = octeon_mgmt_set_settings
1057 };
1058
1059 static const struct net_device_ops octeon_mgmt_ops = {
1060 .ndo_open = octeon_mgmt_open,
1061 .ndo_stop = octeon_mgmt_stop,
1062 .ndo_start_xmit = octeon_mgmt_xmit,
1063 .ndo_set_rx_mode = octeon_mgmt_set_rx_filtering,
1064 .ndo_set_mac_address = octeon_mgmt_set_mac_address,
1065 .ndo_do_ioctl = octeon_mgmt_ioctl,
1066 .ndo_change_mtu = octeon_mgmt_change_mtu,
1067 #ifdef CONFIG_NET_POLL_CONTROLLER
1068 .ndo_poll_controller = octeon_mgmt_poll_controller,
1069 #endif
1070 };
1071
1072 static int __devinit octeon_mgmt_probe(struct platform_device *pdev)
1073 {
1074 struct resource *res_irq;
1075 struct net_device *netdev;
1076 struct octeon_mgmt *p;
1077 int i;
1078
1079 netdev = alloc_etherdev(sizeof(struct octeon_mgmt));
1080 if (netdev == NULL)
1081 return -ENOMEM;
1082
1083 dev_set_drvdata(&pdev->dev, netdev);
1084 p = netdev_priv(netdev);
1085 netif_napi_add(netdev, &p->napi, octeon_mgmt_napi_poll,
1086 OCTEON_MGMT_NAPI_WEIGHT);
1087
1088 p->netdev = netdev;
1089 p->dev = &pdev->dev;
1090
1091 p->port = pdev->id;
1092 snprintf(netdev->name, IFNAMSIZ, "mgmt%d", p->port);
1093
1094 res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
1095 if (!res_irq)
1096 goto err;
1097
1098 p->irq = res_irq->start;
1099 spin_lock_init(&p->lock);
1100
1101 skb_queue_head_init(&p->tx_list);
1102 skb_queue_head_init(&p->rx_list);
1103 tasklet_init(&p->tx_clean_tasklet,
1104 octeon_mgmt_clean_tx_tasklet, (unsigned long)p);
1105
1106 netdev->priv_flags |= IFF_UNICAST_FLT;
1107
1108 netdev->netdev_ops = &octeon_mgmt_ops;
1109 netdev->ethtool_ops = &octeon_mgmt_ethtool_ops;
1110
1111 /* The mgmt ports get the first N MACs. */
1112 for (i = 0; i < 6; i++)
1113 netdev->dev_addr[i] = octeon_bootinfo->mac_addr_base[i];
1114 netdev->dev_addr[5] += p->port;
1115
1116 if (p->port >= octeon_bootinfo->mac_addr_count)
1117 dev_err(&pdev->dev,
1118 "Error %s: Using MAC outside of the assigned range: %pM\n",
1119 netdev->name, netdev->dev_addr);
1120
1121 if (register_netdev(netdev))
1122 goto err;
1123
1124 dev_info(&pdev->dev, "Version " DRV_VERSION "\n");
1125 return 0;
1126 err:
1127 free_netdev(netdev);
1128 return -ENOENT;
1129 }
1130
1131 static int __devexit octeon_mgmt_remove(struct platform_device *pdev)
1132 {
1133 struct net_device *netdev = dev_get_drvdata(&pdev->dev);
1134
1135 unregister_netdev(netdev);
1136 free_netdev(netdev);
1137 return 0;
1138 }
1139
1140 static struct platform_driver octeon_mgmt_driver = {
1141 .driver = {
1142 .name = "octeon_mgmt",
1143 .owner = THIS_MODULE,
1144 },
1145 .probe = octeon_mgmt_probe,
1146 .remove = __devexit_p(octeon_mgmt_remove),
1147 };
1148
1149 extern void octeon_mdiobus_force_mod_depencency(void);
1150
1151 static int __init octeon_mgmt_mod_init(void)
1152 {
1153 /* Force our mdiobus driver module to be loaded first. */
1154 octeon_mdiobus_force_mod_depencency();
1155 return platform_driver_register(&octeon_mgmt_driver);
1156 }
1157
1158 static void __exit octeon_mgmt_mod_exit(void)
1159 {
1160 platform_driver_unregister(&octeon_mgmt_driver);
1161 }
1162
1163 module_init(octeon_mgmt_mod_init);
1164 module_exit(octeon_mgmt_mod_exit);
1165
1166 MODULE_DESCRIPTION(DRV_DESCRIPTION);
1167 MODULE_AUTHOR("David Daney");
1168 MODULE_LICENSE("GPL");
1169 MODULE_VERSION(DRV_VERSION);
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