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pasemi_mac: Don't enable RX/TX without a link (if possible)
[linux-2.6/verdex.git] / drivers / net / pasemi_mac.c
blobbb88a41b759103e5601b22a4831f81f225513245
1 /*
2 * Copyright (C) 2006-2007 PA Semi, Inc
3 *
4 * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/pci.h>
23 #include <linux/interrupt.h>
24 #include <linux/dmaengine.h>
25 #include <linux/delay.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <asm/dma-mapping.h>
29 #include <linux/in.h>
30 #include <linux/skbuff.h>
31
32 #include <linux/ip.h>
33 #include <linux/tcp.h>
34 #include <net/checksum.h>
35 #include <linux/inet_lro.h>
36
37 #include <asm/irq.h>
38 #include <asm/firmware.h>
39 #include <asm/pasemi_dma.h>
40
41 #include "pasemi_mac.h"
42
43 /* We have our own align, since ppc64 in general has it at 0 because
44 * of design flaws in some of the server bridge chips. However, for
45 * PWRficient doing the unaligned copies is more expensive than doing
46 * unaligned DMA, so make sure the data is aligned instead.
47 */
48 #define LOCAL_SKB_ALIGN 2
49
50 /* TODO list
51 *
52 * - Multicast support
53 * - Large MTU support
54 * - SW LRO
55 * - Multiqueue RX/TX
56 */
57
58
59 /* Must be a power of two */
60 #define RX_RING_SIZE 2048
61 #define TX_RING_SIZE 4096
62
63 #define LRO_MAX_AGGR 64
64
65 #define DEFAULT_MSG_ENABLE \
66 (NETIF_MSG_DRV | \
67 NETIF_MSG_PROBE | \
68 NETIF_MSG_LINK | \
69 NETIF_MSG_TIMER | \
70 NETIF_MSG_IFDOWN | \
71 NETIF_MSG_IFUP | \
72 NETIF_MSG_RX_ERR | \
73 NETIF_MSG_TX_ERR)
74
75 #define TX_DESC(tx, num) ((tx)->chan.ring_virt[(num) & (TX_RING_SIZE-1)])
76 #define TX_DESC_INFO(tx, num) ((tx)->ring_info[(num) & (TX_RING_SIZE-1)])
77 #define RX_DESC(rx, num) ((rx)->chan.ring_virt[(num) & (RX_RING_SIZE-1)])
78 #define RX_DESC_INFO(rx, num) ((rx)->ring_info[(num) & (RX_RING_SIZE-1)])
79 #define RX_BUFF(rx, num) ((rx)->buffers[(num) & (RX_RING_SIZE-1)])
80
81 #define RING_USED(ring) (((ring)->next_to_fill - (ring)->next_to_clean) \
82 & ((ring)->size - 1))
83 #define RING_AVAIL(ring) ((ring->size) - RING_USED(ring))
84
85 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
86
87 MODULE_LICENSE("GPL");
88 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
89 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
90
91 static int debug = -1; /* -1 == use DEFAULT_MSG_ENABLE as value */
92 module_param(debug, int, 0);
93 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
94
95 static int translation_enabled(void)
96 {
97 #if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
98 return 1;
99 #else
100 return firmware_has_feature(FW_FEATURE_LPAR);
101 #endif
102 }
103
104 static void write_iob_reg(unsigned int reg, unsigned int val)
105 {
106 pasemi_write_iob_reg(reg, val);
107 }
108
109 static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
110 {
111 return pasemi_read_mac_reg(mac->dma_if, reg);
112 }
113
114 static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
115 unsigned int val)
116 {
117 pasemi_write_mac_reg(mac->dma_if, reg, val);
118 }
119
120 static unsigned int read_dma_reg(unsigned int reg)
121 {
122 return pasemi_read_dma_reg(reg);
123 }
124
125 static void write_dma_reg(unsigned int reg, unsigned int val)
126 {
127 pasemi_write_dma_reg(reg, val);
128 }
129
130 static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
131 {
132 return mac->rx;
133 }
134
135 static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
136 {
137 return mac->tx;
138 }
139
140 static inline void prefetch_skb(const struct sk_buff *skb)
141 {
142 const void *d = skb;
143
144 prefetch(d);
145 prefetch(d+64);
146 prefetch(d+128);
147 prefetch(d+192);
148 }
149
150 static int mac_to_intf(struct pasemi_mac *mac)
151 {
152 struct pci_dev *pdev = mac->pdev;
153 u32 tmp;
154 int nintf, off, i, j;
155 int devfn = pdev->devfn;
156
157 tmp = read_dma_reg(PAS_DMA_CAP_IFI);
158 nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S;
159 off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S;
160
161 /* IOFF contains the offset to the registers containing the
162 * DMA interface-to-MAC-pci-id mappings, and NIN contains number
163 * of total interfaces. Each register contains 4 devfns.
164 * Just do a linear search until we find the devfn of the MAC
165 * we're trying to look up.
166 */
167
168 for (i = 0; i < (nintf+3)/4; i++) {
169 tmp = read_dma_reg(off+4*i);
170 for (j = 0; j < 4; j++) {
171 if (((tmp >> (8*j)) & 0xff) == devfn)
172 return i*4 + j;
173 }
174 }
175 return -1;
176 }
177
178 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
179 {
180 struct pci_dev *pdev = mac->pdev;
181 struct device_node *dn = pci_device_to_OF_node(pdev);
182 int len;
183 const u8 *maddr;
184 u8 addr[6];
185
186 if (!dn) {
187 dev_dbg(&pdev->dev,
188 "No device node for mac, not configuring\n");
189 return -ENOENT;
190 }
191
192 maddr = of_get_property(dn, "local-mac-address", &len);
193
194 if (maddr && len == 6) {
195 memcpy(mac->mac_addr, maddr, 6);
196 return 0;
197 }
198
199 /* Some old versions of firmware mistakenly uses mac-address
200 * (and as a string) instead of a byte array in local-mac-address.
201 */
202
203 if (maddr == NULL)
204 maddr = of_get_property(dn, "mac-address", NULL);
205
206 if (maddr == NULL) {
207 dev_warn(&pdev->dev,
208 "no mac address in device tree, not configuring\n");
209 return -ENOENT;
210 }
211
212 if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
213 &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
214 dev_warn(&pdev->dev,
215 "can't parse mac address, not configuring\n");
216 return -EINVAL;
217 }
218
219 memcpy(mac->mac_addr, addr, 6);
220
221 return 0;
222 }
223
224 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
225 void **tcph, u64 *hdr_flags, void *data)
226 {
227 u64 macrx = (u64) data;
228 unsigned int ip_len;
229 struct iphdr *iph;
230
231 /* IPv4 header checksum failed */
232 if ((macrx & XCT_MACRX_HTY_M) != XCT_MACRX_HTY_IPV4_OK)
233 return -1;
234
235 /* non tcp packet */
236 skb_reset_network_header(skb);
237 iph = ip_hdr(skb);
238 if (iph->protocol != IPPROTO_TCP)
239 return -1;
240
241 ip_len = ip_hdrlen(skb);
242 skb_set_transport_header(skb, ip_len);
243 *tcph = tcp_hdr(skb);
244
245 /* check if ip header and tcp header are complete */
246 if (iph->tot_len < ip_len + tcp_hdrlen(skb))
247 return -1;
248
249 *hdr_flags = LRO_IPV4 | LRO_TCP;
250 *iphdr = iph;
251
252 return 0;
253 }
254
255 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
256 const int nfrags,
257 struct sk_buff *skb,
258 const dma_addr_t *dmas)
259 {
260 int f;
261 struct pci_dev *pdev = mac->dma_pdev;
262
263 pci_unmap_single(pdev, dmas[0], skb_headlen(skb), PCI_DMA_TODEVICE);
264
265 for (f = 0; f < nfrags; f++) {
266 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
267
268 pci_unmap_page(pdev, dmas[f+1], frag->size, PCI_DMA_TODEVICE);
269 }
270 dev_kfree_skb_irq(skb);
271
272 /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
273 * aligned up to a power of 2
274 */
275 return (nfrags + 3) & ~1;
276 }
277
278 static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
279 {
280 struct pasemi_mac_rxring *ring;
281 struct pasemi_mac *mac = netdev_priv(dev);
282 int chno;
283 unsigned int cfg;
284
285 ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
286 offsetof(struct pasemi_mac_rxring, chan));
287
288 if (!ring) {
289 dev_err(&mac->pdev->dev, "Can't allocate RX channel\n");
290 goto out_chan;
291 }
292 chno = ring->chan.chno;
293
294 spin_lock_init(&ring->lock);
295
296 ring->size = RX_RING_SIZE;
297 ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
298 RX_RING_SIZE, GFP_KERNEL);
299
300 if (!ring->ring_info)
301 goto out_ring_info;
302
303 /* Allocate descriptors */
304 if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
305 goto out_ring_desc;
306
307 ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
308 RX_RING_SIZE * sizeof(u64),
309 &ring->buf_dma, GFP_KERNEL);
310 if (!ring->buffers)
311 goto out_ring_desc;
312
313 memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
314
315 write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno),
316 PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma));
317
318 write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno),
319 PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) |
320 PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
321
322 cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
323
324 if (translation_enabled())
325 cfg |= PAS_DMA_RXCHAN_CFG_CTR;
326
327 write_dma_reg(PAS_DMA_RXCHAN_CFG(chno), cfg);
328
329 write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if),
330 PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
331
332 write_dma_reg(PAS_DMA_RXINT_BASEU(mac->dma_if),
333 PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
334 PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
335
336 cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 |
337 PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
338 PAS_DMA_RXINT_CFG_HEN;
339
340 if (translation_enabled())
341 cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;
342
343 write_dma_reg(PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
344
345 ring->next_to_fill = 0;
346 ring->next_to_clean = 0;
347 ring->mac = mac;
348 mac->rx = ring;
349
350 return 0;
351
352 out_ring_desc:
353 kfree(ring->ring_info);
354 out_ring_info:
355 pasemi_dma_free_chan(&ring->chan);
356 out_chan:
357 return -ENOMEM;
358 }
359
360 static struct pasemi_mac_txring *
361 pasemi_mac_setup_tx_resources(const struct net_device *dev)
362 {
363 struct pasemi_mac *mac = netdev_priv(dev);
364 u32 val;
365 struct pasemi_mac_txring *ring;
366 unsigned int cfg;
367 int chno;
368
369 ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),
370 offsetof(struct pasemi_mac_txring, chan));
371
372 if (!ring) {
373 dev_err(&mac->pdev->dev, "Can't allocate TX channel\n");
374 goto out_chan;
375 }
376
377 chno = ring->chan.chno;
378
379 spin_lock_init(&ring->lock);
380
381 ring->size = TX_RING_SIZE;
382 ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
383 TX_RING_SIZE, GFP_KERNEL);
384 if (!ring->ring_info)
385 goto out_ring_info;
386
387 /* Allocate descriptors */
388 if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE))
389 goto out_ring_desc;
390
391 write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
392 PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
393 val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
394 val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
395
396 write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
397
398 cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
399 PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
400 PAS_DMA_TXCHAN_CFG_UP |
401 PAS_DMA_TXCHAN_CFG_WT(2);
402
403 if (translation_enabled())
404 cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
405
406 write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
407
408 ring->next_to_fill = 0;
409 ring->next_to_clean = 0;
410 ring->mac = mac;
411
412 return ring;
413
414 out_ring_desc:
415 kfree(ring->ring_info);
416 out_ring_info:
417 pasemi_dma_free_chan(&ring->chan);
418 out_chan:
419 return NULL;
420 }
421
422 static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
423 {
424 struct pasemi_mac_txring *txring = tx_ring(mac);
425 unsigned int i, j;
426 struct pasemi_mac_buffer *info;
427 dma_addr_t dmas[MAX_SKB_FRAGS+1];
428 int freed, nfrags;
429 int start, limit;
430
431 start = txring->next_to_clean;
432 limit = txring->next_to_fill;
433
434 /* Compensate for when fill has wrapped and clean has not */
435 if (start > limit)
436 limit += TX_RING_SIZE;
437
438 for (i = start; i < limit; i += freed) {
439 info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
440 if (info->dma && info->skb) {
441 nfrags = skb_shinfo(info->skb)->nr_frags;
442 for (j = 0; j <= nfrags; j++)
443 dmas[j] = txring->ring_info[(i+1+j) &
444 (TX_RING_SIZE-1)].dma;
445 freed = pasemi_mac_unmap_tx_skb(mac, nfrags,
446 info->skb, dmas);
447 } else
448 freed = 2;
449 }
450
451 kfree(txring->ring_info);
452 pasemi_dma_free_chan(&txring->chan);
453
454 }
455
456 static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
457 {
458 struct pasemi_mac_rxring *rx = rx_ring(mac);
459 unsigned int i;
460 struct pasemi_mac_buffer *info;
461
462 for (i = 0; i < RX_RING_SIZE; i++) {
463 info = &RX_DESC_INFO(rx, i);
464 if (info->skb && info->dma) {
465 pci_unmap_single(mac->dma_pdev,
466 info->dma,
467 info->skb->len,
468 PCI_DMA_FROMDEVICE);
469 dev_kfree_skb_any(info->skb);
470 }
471 info->dma = 0;
472 info->skb = NULL;
473 }
474
475 for (i = 0; i < RX_RING_SIZE; i++)
476 RX_DESC(rx, i) = 0;
477
478 dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
479 rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
480
481 kfree(rx_ring(mac)->ring_info);
482 pasemi_dma_free_chan(&rx_ring(mac)->chan);
483 mac->rx = NULL;
484 }
485
486 static void pasemi_mac_replenish_rx_ring(const struct net_device *dev,
487 const int limit)
488 {
489 const struct pasemi_mac *mac = netdev_priv(dev);
490 struct pasemi_mac_rxring *rx = rx_ring(mac);
491 int fill, count;
492
493 if (limit <= 0)
494 return;
495
496 fill = rx_ring(mac)->next_to_fill;
497 for (count = 0; count < limit; count++) {
498 struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
499 u64 *buff = &RX_BUFF(rx, fill);
500 struct sk_buff *skb;
501 dma_addr_t dma;
502
503 /* Entry in use? */
504 WARN_ON(*buff);
505
506 skb = dev_alloc_skb(BUF_SIZE);
507 skb_reserve(skb, LOCAL_SKB_ALIGN);
508
509 if (unlikely(!skb))
510 break;
511
512 dma = pci_map_single(mac->dma_pdev, skb->data,
513 BUF_SIZE - LOCAL_SKB_ALIGN,
514 PCI_DMA_FROMDEVICE);
515
516 if (unlikely(dma_mapping_error(dma))) {
517 dev_kfree_skb_irq(info->skb);
518 break;
519 }
520
521 info->skb = skb;
522 info->dma = dma;
523 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
524 fill++;
525 }
526
527 wmb();
528
529 write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count);
530
531 rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
532 (RX_RING_SIZE - 1);
533 }
534
535 static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
536 {
537 struct pasemi_mac_rxring *rx = rx_ring(mac);
538 unsigned int reg, pcnt;
539 /* Re-enable packet count interrupts: finally
540 * ack the packet count interrupt we got in rx_intr.
541 */
542
543 pcnt = *rx->chan.status & PAS_STATUS_PCNT_M;
544
545 reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
546
547 if (*rx->chan.status & PAS_STATUS_TIMER)
548 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
549
550 write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
551 }
552
553 static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
554 {
555 unsigned int reg, pcnt;
556
557 /* Re-enable packet count interrupts */
558 pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M;
559
560 reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
561
562 write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg);
563 }
564
565
566 static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
567 const u64 macrx)
568 {
569 unsigned int rcmdsta, ccmdsta;
570 struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
571
572 if (!netif_msg_rx_err(mac))
573 return;
574
575 rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
576 ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno));
577
578 printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
579 macrx, *chan->status);
580
581 printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
582 rcmdsta, ccmdsta);
583 }
584
585 static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
586 const u64 mactx)
587 {
588 unsigned int cmdsta;
589 struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
590
591 if (!netif_msg_tx_err(mac))
592 return;
593
594 cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno));
595
596 printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
597 "tx status 0x%016lx\n", mactx, *chan->status);
598
599 printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
600 }
601
602 static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
603 const int limit)
604 {
605 const struct pasemi_dmachan *chan = &rx->chan;
606 struct pasemi_mac *mac = rx->mac;
607 struct pci_dev *pdev = mac->dma_pdev;
608 unsigned int n;
609 int count, buf_index, tot_bytes, packets;
610 struct pasemi_mac_buffer *info;
611 struct sk_buff *skb;
612 unsigned int len;
613 u64 macrx, eval;
614 dma_addr_t dma;
615
616 tot_bytes = 0;
617 packets = 0;
618
619 spin_lock(&rx->lock);
620
621 n = rx->next_to_clean;
622
623 prefetch(&RX_DESC(rx, n));
624
625 for (count = 0; count < limit; count++) {
626 macrx = RX_DESC(rx, n);
627 prefetch(&RX_DESC(rx, n+4));
628
629 if ((macrx & XCT_MACRX_E) ||
630 (*chan->status & PAS_STATUS_ERROR))
631 pasemi_mac_rx_error(mac, macrx);
632
633 if (!(macrx & XCT_MACRX_O))
634 break;
635
636 info = NULL;
637
638 BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));
639
640 eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
641 XCT_RXRES_8B_EVAL_S;
642 buf_index = eval-1;
643
644 dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
645 info = &RX_DESC_INFO(rx, buf_index);
646
647 skb = info->skb;
648
649 prefetch_skb(skb);
650
651 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
652
653 pci_unmap_single(pdev, dma, BUF_SIZE-LOCAL_SKB_ALIGN,
654 PCI_DMA_FROMDEVICE);
655
656 if (macrx & XCT_MACRX_CRC) {
657 /* CRC error flagged */
658 mac->netdev->stats.rx_errors++;
659 mac->netdev->stats.rx_crc_errors++;
660 /* No need to free skb, it'll be reused */
661 goto next;
662 }
663
664 info->skb = NULL;
665 info->dma = 0;
666
667 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
668 skb->ip_summed = CHECKSUM_UNNECESSARY;
669 skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
670 XCT_MACRX_CSUM_S;
671 } else
672 skb->ip_summed = CHECKSUM_NONE;
673
674 packets++;
675 tot_bytes += len;
676
677 /* Don't include CRC */
678 skb_put(skb, len-4);
679
680 skb->protocol = eth_type_trans(skb, mac->netdev);
681 lro_receive_skb(&mac->lro_mgr, skb, (void *)macrx);
682
683 next:
684 RX_DESC(rx, n) = 0;
685 RX_DESC(rx, n+1) = 0;
686
687 /* Need to zero it out since hardware doesn't, since the
688 * replenish loop uses it to tell when it's done.
689 */
690 RX_BUFF(rx, buf_index) = 0;
691
692 n += 4;
693 }
694
695 if (n > RX_RING_SIZE) {
696 /* Errata 5971 workaround: L2 target of headers */
697 write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0);
698 n &= (RX_RING_SIZE-1);
699 }
700
701 rx_ring(mac)->next_to_clean = n;
702
703 lro_flush_all(&mac->lro_mgr);
704
705 /* Increase is in number of 16-byte entries, and since each descriptor
706 * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
707 * count*2.
708 */
709 write_dma_reg(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1);
710
711 pasemi_mac_replenish_rx_ring(mac->netdev, count);
712
713 mac->netdev->stats.rx_bytes += tot_bytes;
714 mac->netdev->stats.rx_packets += packets;
715
716 spin_unlock(&rx_ring(mac)->lock);
717
718 return count;
719 }
720
721 /* Can't make this too large or we blow the kernel stack limits */
722 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
723
724 static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring)
725 {
726 struct pasemi_dmachan *chan = &txring->chan;
727 struct pasemi_mac *mac = txring->mac;
728 int i, j;
729 unsigned int start, descr_count, buf_count, batch_limit;
730 unsigned int ring_limit;
731 unsigned int total_count;
732 unsigned long flags;
733 struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
734 dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
735 int nf[TX_CLEAN_BATCHSIZE];
736 int nr_frags;
737
738 total_count = 0;
739 batch_limit = TX_CLEAN_BATCHSIZE;
740 restart:
741 spin_lock_irqsave(&txring->lock, flags);
742
743 start = txring->next_to_clean;
744 ring_limit = txring->next_to_fill;
745
746 prefetch(&TX_DESC_INFO(txring, start+1).skb);
747
748 /* Compensate for when fill has wrapped but clean has not */
749 if (start > ring_limit)
750 ring_limit += TX_RING_SIZE;
751
752 buf_count = 0;
753 descr_count = 0;
754
755 for (i = start;
756 descr_count < batch_limit && i < ring_limit;
757 i += buf_count) {
758 u64 mactx = TX_DESC(txring, i);
759 struct sk_buff *skb;
760
761 skb = TX_DESC_INFO(txring, i+1).skb;
762 nr_frags = TX_DESC_INFO(txring, i).dma;
763
764 if ((mactx & XCT_MACTX_E) ||
765 (*chan->status & PAS_STATUS_ERROR))
766 pasemi_mac_tx_error(mac, mactx);
767
768 if (unlikely(mactx & XCT_MACTX_O))
769 /* Not yet transmitted */
770 break;
771
772 buf_count = 2 + nr_frags;
773 /* Since we always fill with an even number of entries, make
774 * sure we skip any unused one at the end as well.
775 */
776 if (buf_count & 1)
777 buf_count++;
778
779 for (j = 0; j <= nr_frags; j++)
780 dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
781
782 skbs[descr_count] = skb;
783 nf[descr_count] = nr_frags;
784
785 TX_DESC(txring, i) = 0;
786 TX_DESC(txring, i+1) = 0;
787
788 descr_count++;
789 }
790 txring->next_to_clean = i & (TX_RING_SIZE-1);
791
792 spin_unlock_irqrestore(&txring->lock, flags);
793 netif_wake_queue(mac->netdev);
794
795 for (i = 0; i < descr_count; i++)
796 pasemi_mac_unmap_tx_skb(mac, nf[i], skbs[i], dmas[i]);
797
798 total_count += descr_count;
799
800 /* If the batch was full, try to clean more */
801 if (descr_count == batch_limit)
802 goto restart;
803
804 return total_count;
805 }
806
807
808 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
809 {
810 const struct pasemi_mac_rxring *rxring = data;
811 struct pasemi_mac *mac = rxring->mac;
812 struct net_device *dev = mac->netdev;
813 const struct pasemi_dmachan *chan = &rxring->chan;
814 unsigned int reg;
815
816 if (!(*chan->status & PAS_STATUS_CAUSE_M))
817 return IRQ_NONE;
818
819 /* Don't reset packet count so it won't fire again but clear
820 * all others.
821 */
822
823 reg = 0;
824 if (*chan->status & PAS_STATUS_SOFT)
825 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
826 if (*chan->status & PAS_STATUS_ERROR)
827 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
828
829 netif_rx_schedule(dev, &mac->napi);
830
831 write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg);
832
833 return IRQ_HANDLED;
834 }
835
836 #define TX_CLEAN_INTERVAL HZ
837
838 static void pasemi_mac_tx_timer(unsigned long data)
839 {
840 struct pasemi_mac_txring *txring = (struct pasemi_mac_txring *)data;
841 struct pasemi_mac *mac = txring->mac;
842
843 pasemi_mac_clean_tx(txring);
844
845 mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL);
846
847 pasemi_mac_restart_tx_intr(mac);
848 }
849
850 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
851 {
852 struct pasemi_mac_txring *txring = data;
853 const struct pasemi_dmachan *chan = &txring->chan;
854 struct pasemi_mac *mac = txring->mac;
855 unsigned int reg;
856
857 if (!(*chan->status & PAS_STATUS_CAUSE_M))
858 return IRQ_NONE;
859
860 reg = 0;
861
862 if (*chan->status & PAS_STATUS_SOFT)
863 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
864 if (*chan->status & PAS_STATUS_ERROR)
865 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
866
867 mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2);
868
869 netif_rx_schedule(mac->netdev, &mac->napi);
870
871 if (reg)
872 write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), reg);
873
874 return IRQ_HANDLED;
875 }
876
877 static void pasemi_mac_intf_disable(struct pasemi_mac *mac)
878 {
879 unsigned int flags;
880
881 flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
882 flags &= ~PAS_MAC_CFG_PCFG_PE;
883 write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
884 }
885
886 static void pasemi_mac_intf_enable(struct pasemi_mac *mac)
887 {
888 unsigned int flags;
889
890 flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
891 flags |= PAS_MAC_CFG_PCFG_PE;
892 write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
893 }
894
895 static void pasemi_adjust_link(struct net_device *dev)
896 {
897 struct pasemi_mac *mac = netdev_priv(dev);
898 int msg;
899 unsigned int flags;
900 unsigned int new_flags;
901
902 if (!mac->phydev->link) {
903 /* If no link, MAC speed settings don't matter. Just report
904 * link down and return.
905 */
906 if (mac->link && netif_msg_link(mac))
907 printk(KERN_INFO "%s: Link is down.\n", dev->name);
908
909 netif_carrier_off(dev);
910 pasemi_mac_intf_disable(mac);
911 mac->link = 0;
912
913 return;
914 } else {
915 pasemi_mac_intf_enable(mac);
916 netif_carrier_on(dev);
917 }
918
919 flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
920 new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
921 PAS_MAC_CFG_PCFG_TSR_M);
922
923 if (!mac->phydev->duplex)
924 new_flags |= PAS_MAC_CFG_PCFG_HD;
925
926 switch (mac->phydev->speed) {
927 case 1000:
928 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
929 PAS_MAC_CFG_PCFG_TSR_1G;
930 break;
931 case 100:
932 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
933 PAS_MAC_CFG_PCFG_TSR_100M;
934 break;
935 case 10:
936 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
937 PAS_MAC_CFG_PCFG_TSR_10M;
938 break;
939 default:
940 printk("Unsupported speed %d\n", mac->phydev->speed);
941 }
942
943 /* Print on link or speed/duplex change */
944 msg = mac->link != mac->phydev->link || flags != new_flags;
945
946 mac->duplex = mac->phydev->duplex;
947 mac->speed = mac->phydev->speed;
948 mac->link = mac->phydev->link;
949
950 if (new_flags != flags)
951 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
952
953 if (msg && netif_msg_link(mac))
954 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
955 dev->name, mac->speed, mac->duplex ? "full" : "half");
956 }
957
958 static int pasemi_mac_phy_init(struct net_device *dev)
959 {
960 struct pasemi_mac *mac = netdev_priv(dev);
961 struct device_node *dn, *phy_dn;
962 struct phy_device *phydev;
963 unsigned int phy_id;
964 const phandle *ph;
965 const unsigned int *prop;
966 struct resource r;
967 int ret;
968
969 dn = pci_device_to_OF_node(mac->pdev);
970 ph = of_get_property(dn, "phy-handle", NULL);
971 if (!ph)
972 return -ENODEV;
973 phy_dn = of_find_node_by_phandle(*ph);
974
975 prop = of_get_property(phy_dn, "reg", NULL);
976 ret = of_address_to_resource(phy_dn->parent, 0, &r);
977 if (ret)
978 goto err;
979
980 phy_id = *prop;
981 snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
982
983 of_node_put(phy_dn);
984
985 mac->link = 0;
986 mac->speed = 0;
987 mac->duplex = -1;
988
989 phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
990
991 if (IS_ERR(phydev)) {
992 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
993 return PTR_ERR(phydev);
994 }
995
996 mac->phydev = phydev;
997
998 return 0;
999
1000 err:
1001 of_node_put(phy_dn);
1002 return -ENODEV;
1003 }
1004
1005
1006 static int pasemi_mac_open(struct net_device *dev)
1007 {
1008 struct pasemi_mac *mac = netdev_priv(dev);
1009 unsigned int flags;
1010 int ret;
1011
1012 /* enable rx section */
1013 write_dma_reg(PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
1014
1015 /* enable tx section */
1016 write_dma_reg(PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
1017
1018 flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
1019 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
1020 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
1021
1022 write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
1023
1024 ret = pasemi_mac_setup_rx_resources(dev);
1025 if (ret)
1026 goto out_rx_resources;
1027
1028 mac->tx = pasemi_mac_setup_tx_resources(dev);
1029
1030 if (!mac->tx)
1031 goto out_tx_ring;
1032
1033 /* 0x3ff with 33MHz clock is about 31us */
1034 write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG,
1035 PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff));
1036
1037 write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno),
1038 PAS_IOB_DMA_RXCH_CFG_CNTTH(256));
1039
1040 write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno),
1041 PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
1042
1043 write_mac_reg(mac, PAS_MAC_IPC_CHNL,
1044 PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) |
1045 PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno));
1046
1047 /* enable rx if */
1048 write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1049 PAS_DMA_RXINT_RCMDSTA_EN |
1050 PAS_DMA_RXINT_RCMDSTA_DROPS_M |
1051 PAS_DMA_RXINT_RCMDSTA_BP |
1052 PAS_DMA_RXINT_RCMDSTA_OO |
1053 PAS_DMA_RXINT_RCMDSTA_BT);
1054
1055 /* enable rx channel */
1056 pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU |
1057 PAS_DMA_RXCHAN_CCMDSTA_OD |
1058 PAS_DMA_RXCHAN_CCMDSTA_FD |
1059 PAS_DMA_RXCHAN_CCMDSTA_DT);
1060
1061 /* enable tx channel */
1062 pasemi_dma_start_chan(&tx_ring(mac)->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
1063 PAS_DMA_TXCHAN_TCMDSTA_DB |
1064 PAS_DMA_TXCHAN_TCMDSTA_DE |
1065 PAS_DMA_TXCHAN_TCMDSTA_DA);
1066
1067 pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
1068
1069 write_dma_reg(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno),
1070 RX_RING_SIZE>>1);
1071
1072 /* Clear out any residual packet count state from firmware */
1073 pasemi_mac_restart_rx_intr(mac);
1074 pasemi_mac_restart_tx_intr(mac);
1075
1076 flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
1077
1078 if (mac->type == MAC_TYPE_GMAC)
1079 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
1080 else
1081 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
1082
1083 /* Enable interface in MAC */
1084 write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1085
1086 ret = pasemi_mac_phy_init(dev);
1087 if (ret) {
1088 /* Since we won't get link notification, just enable RX */
1089 pasemi_mac_intf_enable(mac);
1090 if (mac->type == MAC_TYPE_GMAC) {
1091 /* Warn for missing PHY on SGMII (1Gig) ports */
1092 dev_warn(&mac->pdev->dev,
1093 "PHY init failed: %d.\n", ret);
1094 dev_warn(&mac->pdev->dev,
1095 "Defaulting to 1Gbit full duplex\n");
1096 }
1097 }
1098
1099 netif_start_queue(dev);
1100 napi_enable(&mac->napi);
1101
1102 snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
1103 dev->name);
1104
1105 ret = request_irq(mac->tx->chan.irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
1106 mac->tx_irq_name, mac->tx);
1107 if (ret) {
1108 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1109 mac->tx->chan.irq, ret);
1110 goto out_tx_int;
1111 }
1112
1113 snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
1114 dev->name);
1115
1116 ret = request_irq(mac->rx->chan.irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
1117 mac->rx_irq_name, mac->rx);
1118 if (ret) {
1119 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1120 mac->rx->chan.irq, ret);
1121 goto out_rx_int;
1122 }
1123
1124 if (mac->phydev)
1125 phy_start(mac->phydev);
1126
1127 init_timer(&mac->tx->clean_timer);
1128 mac->tx->clean_timer.function = pasemi_mac_tx_timer;
1129 mac->tx->clean_timer.data = (unsigned long)mac->tx;
1130 mac->tx->clean_timer.expires = jiffies+HZ;
1131 add_timer(&mac->tx->clean_timer);
1132
1133 return 0;
1134
1135 out_rx_int:
1136 free_irq(mac->tx->chan.irq, mac->tx);
1137 out_tx_int:
1138 napi_disable(&mac->napi);
1139 netif_stop_queue(dev);
1140 out_tx_ring:
1141 if (mac->tx)
1142 pasemi_mac_free_tx_resources(mac);
1143 pasemi_mac_free_rx_resources(mac);
1144 out_rx_resources:
1145
1146 return ret;
1147 }
1148
1149 #define MAX_RETRIES 5000
1150
1151 static int pasemi_mac_close(struct net_device *dev)
1152 {
1153 struct pasemi_mac *mac = netdev_priv(dev);
1154 unsigned int sta;
1155 int retries;
1156 int rxch, txch;
1157
1158 rxch = rx_ring(mac)->chan.chno;
1159 txch = tx_ring(mac)->chan.chno;
1160
1161 if (mac->phydev) {
1162 phy_stop(mac->phydev);
1163 phy_disconnect(mac->phydev);
1164 }
1165
1166 del_timer_sync(&mac->tx->clean_timer);
1167
1168 netif_stop_queue(dev);
1169 napi_disable(&mac->napi);
1170
1171 sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1172 if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
1173 PAS_DMA_RXINT_RCMDSTA_OO |
1174 PAS_DMA_RXINT_RCMDSTA_BT))
1175 printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);
1176
1177 sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1178 if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
1179 PAS_DMA_RXCHAN_CCMDSTA_OD |
1180 PAS_DMA_RXCHAN_CCMDSTA_FD |
1181 PAS_DMA_RXCHAN_CCMDSTA_DT))
1182 printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);
1183
1184 sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1185 if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB |
1186 PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA))
1187 printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);
1188
1189 /* Clean out any pending buffers */
1190 pasemi_mac_clean_tx(tx_ring(mac));
1191 pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1192
1193 /* Disable interface */
1194 write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch),
1195 PAS_DMA_TXCHAN_TCMDSTA_ST);
1196 write_dma_reg( PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1197 PAS_DMA_RXINT_RCMDSTA_ST);
1198 write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch),
1199 PAS_DMA_RXCHAN_CCMDSTA_ST);
1200
1201 for (retries = 0; retries < MAX_RETRIES; retries++) {
1202 sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(rxch));
1203 if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1204 break;
1205 cond_resched();
1206 }
1207
1208 if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1209 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
1210
1211 for (retries = 0; retries < MAX_RETRIES; retries++) {
1212 sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1213 if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1214 break;
1215 cond_resched();
1216 }
1217
1218 if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1219 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
1220
1221 for (retries = 0; retries < MAX_RETRIES; retries++) {
1222 sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1223 if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
1224 break;
1225 cond_resched();
1226 }
1227
1228 if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
1229 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
1230
1231 /* Then, disable the channel. This must be done separately from
1232 * stopping, since you can't disable when active.
1233 */
1234
1235 write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0);
1236 write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0);
1237 write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1238
1239 free_irq(mac->tx->chan.irq, mac->tx);
1240 free_irq(mac->rx->chan.irq, mac->rx);
1241
1242 /* Free resources */
1243 pasemi_mac_free_rx_resources(mac);
1244 pasemi_mac_free_tx_resources(mac);
1245
1246 return 0;
1247 }
1248
1249 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1250 {
1251 struct pasemi_mac *mac = netdev_priv(dev);
1252 struct pasemi_mac_txring *txring;
1253 u64 dflags, mactx;
1254 dma_addr_t map[MAX_SKB_FRAGS+1];
1255 unsigned int map_size[MAX_SKB_FRAGS+1];
1256 unsigned long flags;
1257 int i, nfrags;
1258 int fill;
1259
1260 dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
1261
1262 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1263 const unsigned char *nh = skb_network_header(skb);
1264
1265 switch (ip_hdr(skb)->protocol) {
1266 case IPPROTO_TCP:
1267 dflags |= XCT_MACTX_CSUM_TCP;
1268 dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1269 dflags |= XCT_MACTX_IPO(nh - skb->data);
1270 break;
1271 case IPPROTO_UDP:
1272 dflags |= XCT_MACTX_CSUM_UDP;
1273 dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1274 dflags |= XCT_MACTX_IPO(nh - skb->data);
1275 break;
1276 }
1277 }
1278
1279 nfrags = skb_shinfo(skb)->nr_frags;
1280
1281 map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
1282 PCI_DMA_TODEVICE);
1283 map_size[0] = skb_headlen(skb);
1284 if (dma_mapping_error(map[0]))
1285 goto out_err_nolock;
1286
1287 for (i = 0; i < nfrags; i++) {
1288 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1289
1290 map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
1291 frag->page_offset, frag->size,
1292 PCI_DMA_TODEVICE);
1293 map_size[i+1] = frag->size;
1294 if (dma_mapping_error(map[i+1])) {
1295 nfrags = i;
1296 goto out_err_nolock;
1297 }
1298 }
1299
1300 mactx = dflags | XCT_MACTX_LLEN(skb->len);
1301
1302 txring = tx_ring(mac);
1303
1304 spin_lock_irqsave(&txring->lock, flags);
1305
1306 fill = txring->next_to_fill;
1307
1308 /* Avoid stepping on the same cache line that the DMA controller
1309 * is currently about to send, so leave at least 8 words available.
1310 * Total free space needed is mactx + fragments + 8
1311 */
1312 if (RING_AVAIL(txring) < nfrags + 10) {
1313 /* no room -- stop the queue and wait for tx intr */
1314 netif_stop_queue(dev);
1315 goto out_err;
1316 }
1317
1318 TX_DESC(txring, fill) = mactx;
1319 TX_DESC_INFO(txring, fill).dma = nfrags;
1320 fill++;
1321 TX_DESC_INFO(txring, fill).skb = skb;
1322 for (i = 0; i <= nfrags; i++) {
1323 TX_DESC(txring, fill+i) =
1324 XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1325 TX_DESC_INFO(txring, fill+i).dma = map[i];
1326 }
1327
1328 /* We have to add an even number of 8-byte entries to the ring
1329 * even if the last one is unused. That means always an odd number
1330 * of pointers + one mactx descriptor.
1331 */
1332 if (nfrags & 1)
1333 nfrags++;
1334
1335 txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1);
1336
1337 dev->stats.tx_packets++;
1338 dev->stats.tx_bytes += skb->len;
1339
1340 spin_unlock_irqrestore(&txring->lock, flags);
1341
1342 write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (nfrags+2) >> 1);
1343
1344 return NETDEV_TX_OK;
1345
1346 out_err:
1347 spin_unlock_irqrestore(&txring->lock, flags);
1348 out_err_nolock:
1349 while (nfrags--)
1350 pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
1351 PCI_DMA_TODEVICE);
1352
1353 return NETDEV_TX_BUSY;
1354 }
1355
1356 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1357 {
1358 const struct pasemi_mac *mac = netdev_priv(dev);
1359 unsigned int flags;
1360
1361 flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1362
1363 /* Set promiscuous */
1364 if (dev->flags & IFF_PROMISC)
1365 flags |= PAS_MAC_CFG_PCFG_PR;
1366 else
1367 flags &= ~PAS_MAC_CFG_PCFG_PR;
1368
1369 write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1370 }
1371
1372
1373 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1374 {
1375 struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1376 struct net_device *dev = mac->netdev;
1377 int pkts;
1378
1379 pasemi_mac_clean_tx(tx_ring(mac));
1380 pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
1381 if (pkts < budget) {
1382 /* all done, no more packets present */
1383 netif_rx_complete(dev, napi);
1384
1385 pasemi_mac_restart_rx_intr(mac);
1386 pasemi_mac_restart_tx_intr(mac);
1387 }
1388 return pkts;
1389 }
1390
1391 static int __devinit
1392 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1393 {
1394 struct net_device *dev;
1395 struct pasemi_mac *mac;
1396 int err;
1397 DECLARE_MAC_BUF(mac_buf);
1398
1399 err = pci_enable_device(pdev);
1400 if (err)
1401 return err;
1402
1403 dev = alloc_etherdev(sizeof(struct pasemi_mac));
1404 if (dev == NULL) {
1405 dev_err(&pdev->dev,
1406 "pasemi_mac: Could not allocate ethernet device.\n");
1407 err = -ENOMEM;
1408 goto out_disable_device;
1409 }
1410
1411 pci_set_drvdata(pdev, dev);
1412 SET_NETDEV_DEV(dev, &pdev->dev);
1413
1414 mac = netdev_priv(dev);
1415
1416 mac->pdev = pdev;
1417 mac->netdev = dev;
1418
1419 netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
1420
1421 dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG |
1422 NETIF_F_HIGHDMA;
1423
1424 mac->lro_mgr.max_aggr = LRO_MAX_AGGR;
1425 mac->lro_mgr.max_desc = MAX_LRO_DESCRIPTORS;
1426 mac->lro_mgr.lro_arr = mac->lro_desc;
1427 mac->lro_mgr.get_skb_header = get_skb_hdr;
1428 mac->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
1429 mac->lro_mgr.dev = mac->netdev;
1430 mac->lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
1431 mac->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1432
1433
1434 mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1435 if (!mac->dma_pdev) {
1436 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1437 err = -ENODEV;
1438 goto out;
1439 }
1440
1441 mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1442 if (!mac->iob_pdev) {
1443 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1444 err = -ENODEV;
1445 goto out;
1446 }
1447
1448 /* get mac addr from device tree */
1449 if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1450 err = -ENODEV;
1451 goto out;
1452 }
1453 memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1454
1455 mac->dma_if = mac_to_intf(mac);
1456 if (mac->dma_if < 0) {
1457 dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
1458 err = -ENODEV;
1459 goto out;
1460 }
1461
1462 switch (pdev->device) {
1463 case 0xa005:
1464 mac->type = MAC_TYPE_GMAC;
1465 break;
1466 case 0xa006:
1467 mac->type = MAC_TYPE_XAUI;
1468 break;
1469 default:
1470 err = -ENODEV;
1471 goto out;
1472 }
1473
1474 dev->open = pasemi_mac_open;
1475 dev->stop = pasemi_mac_close;
1476 dev->hard_start_xmit = pasemi_mac_start_tx;
1477 dev->set_multicast_list = pasemi_mac_set_rx_mode;
1478
1479 if (err)
1480 goto out;
1481
1482 mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1483
1484 /* Enable most messages by default */
1485 mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1486
1487 err = register_netdev(dev);
1488
1489 if (err) {
1490 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1491 err);
1492 goto out;
1493 } else if netif_msg_probe(mac)
1494 printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %s\n",
1495 dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1496 mac->dma_if, print_mac(mac_buf, dev->dev_addr));
1497
1498 return err;
1499
1500 out:
1501 if (mac->iob_pdev)
1502 pci_dev_put(mac->iob_pdev);
1503 if (mac->dma_pdev)
1504 pci_dev_put(mac->dma_pdev);
1505
1506 free_netdev(dev);
1507 out_disable_device:
1508 pci_disable_device(pdev);
1509 return err;
1510
1511 }
1512
1513 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1514 {
1515 struct net_device *netdev = pci_get_drvdata(pdev);
1516 struct pasemi_mac *mac;
1517
1518 if (!netdev)
1519 return;
1520
1521 mac = netdev_priv(netdev);
1522
1523 unregister_netdev(netdev);
1524
1525 pci_disable_device(pdev);
1526 pci_dev_put(mac->dma_pdev);
1527 pci_dev_put(mac->iob_pdev);
1528
1529 pasemi_dma_free_chan(&mac->tx->chan);
1530 pasemi_dma_free_chan(&mac->rx->chan);
1531
1532 pci_set_drvdata(pdev, NULL);
1533 free_netdev(netdev);
1534 }
1535
1536 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1537 { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1538 { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1539 { },
1540 };
1541
1542 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1543
1544 static struct pci_driver pasemi_mac_driver = {
1545 .name = "pasemi_mac",
1546 .id_table = pasemi_mac_pci_tbl,
1547 .probe = pasemi_mac_probe,
1548 .remove = __devexit_p(pasemi_mac_remove),
1549 };
1550
1551 static void __exit pasemi_mac_cleanup_module(void)
1552 {
1553 pci_unregister_driver(&pasemi_mac_driver);
1554 }
1555
1556 int pasemi_mac_init_module(void)
1557 {
1558 int err;
1559
1560 err = pasemi_dma_init();
1561 if (err)
1562 return err;
1563
1564 return pci_register_driver(&pasemi_mac_driver);
1565 }
1566
1567 module_init(pasemi_mac_init_module);
1568 module_exit(pasemi_mac_cleanup_module);
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