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1/*
2 * Network device driver for Cell Processor-Based Blade and Celleb platform
3 *
4 * (C) Copyright IBM Corp. 2005
5 * (C) Copyright 2006 TOSHIBA CORPORATION
6 *
7 * Authors : Utz Bacher <utz.bacher@de.ibm.com>
8 * Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
13 * any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25#include <linux/compiler.h>
26#include <linux/crc32.h>
27#include <linux/delay.h>
28#include <linux/etherdevice.h>
29#include <linux/ethtool.h>
30#include <linux/firmware.h>
31#include <linux/if_vlan.h>
32#include <linux/in.h>
33#include <linux/init.h>
34#include <linux/interrupt.h>
35#include <linux/gfp.h>
36#include <linux/ioport.h>
37#include <linux/ip.h>
38#include <linux/kernel.h>
39#include <linux/mii.h>
40#include <linux/module.h>
41#include <linux/netdevice.h>
42#include <linux/device.h>
43#include <linux/pci.h>
44#include <linux/skbuff.h>
45#include <linux/tcp.h>
46#include <linux/types.h>
47#include <linux/vmalloc.h>
48#include <linux/wait.h>
49#include <linux/workqueue.h>
50#include <linux/bitops.h>
51#include <net/checksum.h>
52
53#include "spider_net.h"
54
55MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
56 "<Jens.Osterkamp@de.ibm.com>");
57MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
58MODULE_LICENSE("GPL");
59MODULE_VERSION(VERSION);
60MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME);
61
62static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
63static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
64
65module_param(rx_descriptors, int, 0444);
66module_param(tx_descriptors, int, 0444);
67
68MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
69 "in rx chains");
70MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
71 "in tx chain");
72
73char spider_net_driver_name[] = "spidernet";
74
75static const struct pci_device_id spider_net_pci_tbl[] = {
76 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
77 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
78 { 0, }
79};
80
81MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
82
83/**
84 * spider_net_read_reg - reads an SMMIO register of a card
85 * @card: device structure
86 * @reg: register to read from
87 *
88 * returns the content of the specified SMMIO register.
89 */
90static inline u32
91spider_net_read_reg(struct spider_net_card *card, u32 reg)
92{
93 /* We use the powerpc specific variants instead of readl_be() because
94 * we know spidernet is not a real PCI device and we can thus avoid the
95 * performance hit caused by the PCI workarounds.
96 */
97 return in_be32(card->regs + reg);
98}
99
100/**
101 * spider_net_write_reg - writes to an SMMIO register of a card
102 * @card: device structure
103 * @reg: register to write to
104 * @value: value to write into the specified SMMIO register
105 */
106static inline void
107spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
108{
109 /* We use the powerpc specific variants instead of writel_be() because
110 * we know spidernet is not a real PCI device and we can thus avoid the
111 * performance hit caused by the PCI workarounds.
112 */
113 out_be32(card->regs + reg, value);
114}
115
116/**
117 * spider_net_write_phy - write to phy register
118 * @netdev: adapter to be written to
119 * @mii_id: id of MII
120 * @reg: PHY register
121 * @val: value to be written to phy register
122 *
123 * spider_net_write_phy_register writes to an arbitrary PHY
124 * register via the spider GPCWOPCMD register. We assume the queue does
125 * not run full (not more than 15 commands outstanding).
126 **/
127static void
128spider_net_write_phy(struct net_device *netdev, int mii_id,
129 int reg, int val)
130{
131 struct spider_net_card *card = netdev_priv(netdev);
132 u32 writevalue;
133
134 writevalue = ((u32)mii_id << 21) |
135 ((u32)reg << 16) | ((u32)val);
136
137 spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
138}
139
140/**
141 * spider_net_read_phy - read from phy register
142 * @netdev: network device to be read from
143 * @mii_id: id of MII
144 * @reg: PHY register
145 *
146 * Returns value read from PHY register
147 *
148 * spider_net_write_phy reads from an arbitrary PHY
149 * register via the spider GPCROPCMD register
150 **/
151static int
152spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
153{
154 struct spider_net_card *card = netdev_priv(netdev);
155 u32 readvalue;
156
157 readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
158 spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
159
160 /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
161 * interrupt, as we poll for the completion of the read operation
162 * in spider_net_read_phy. Should take about 50 us */
163 do {
164 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
165 } while (readvalue & SPIDER_NET_GPREXEC);
166
167 readvalue &= SPIDER_NET_GPRDAT_MASK;
168
169 return readvalue;
170}
171
172/**
173 * spider_net_setup_aneg - initial auto-negotiation setup
174 * @card: device structure
175 **/
176static void
177spider_net_setup_aneg(struct spider_net_card *card)
178{
179 struct mii_phy *phy = &card->phy;
180 u32 advertise = 0;
181 u16 bmsr, estat;
182
183 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
184 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
185
186 if (bmsr & BMSR_10HALF)
187 advertise |= ADVERTISED_10baseT_Half;
188 if (bmsr & BMSR_10FULL)
189 advertise |= ADVERTISED_10baseT_Full;
190 if (bmsr & BMSR_100HALF)
191 advertise |= ADVERTISED_100baseT_Half;
192 if (bmsr & BMSR_100FULL)
193 advertise |= ADVERTISED_100baseT_Full;
194
195 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
196 advertise |= SUPPORTED_1000baseT_Full;
197 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
198 advertise |= SUPPORTED_1000baseT_Half;
199
200 sungem_phy_probe(phy, phy->mii_id);
201 phy->def->ops->setup_aneg(phy, advertise);
202
203}
204
205/**
206 * spider_net_rx_irq_off - switch off rx irq on this spider card
207 * @card: device structure
208 *
209 * switches off rx irq by masking them out in the GHIINTnMSK register
210 */
211static void
212spider_net_rx_irq_off(struct spider_net_card *card)
213{
214 u32 regvalue;
215
216 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
217 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
218}
219
220/**
221 * spider_net_rx_irq_on - switch on rx irq on this spider card
222 * @card: device structure
223 *
224 * switches on rx irq by enabling them in the GHIINTnMSK register
225 */
226static void
227spider_net_rx_irq_on(struct spider_net_card *card)
228{
229 u32 regvalue;
230
231 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
232 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
233}
234
235/**
236 * spider_net_set_promisc - sets the unicast address or the promiscuous mode
237 * @card: card structure
238 *
239 * spider_net_set_promisc sets the unicast destination address filter and
240 * thus either allows for non-promisc mode or promisc mode
241 */
242static void
243spider_net_set_promisc(struct spider_net_card *card)
244{
245 u32 macu, macl;
246 struct net_device *netdev = card->netdev;
247
248 if (netdev->flags & IFF_PROMISC) {
249 /* clear destination entry 0 */
250 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
251 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
252 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
253 SPIDER_NET_PROMISC_VALUE);
254 } else {
255 macu = netdev->dev_addr[0];
256 macu <<= 8;
257 macu |= netdev->dev_addr[1];
258 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
259
260 macu |= SPIDER_NET_UA_DESCR_VALUE;
261 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
262 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
263 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
264 SPIDER_NET_NONPROMISC_VALUE);
265 }
266}
267
268/**
269 * spider_net_get_descr_status -- returns the status of a descriptor
270 * @descr: descriptor to look at
271 *
272 * returns the status as in the dmac_cmd_status field of the descriptor
273 */
274static inline int
275spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
276{
277 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
278}
279
280/**
281 * spider_net_free_chain - free descriptor chain
282 * @card: card structure
283 * @chain: address of chain
284 *
285 */
286static void
287spider_net_free_chain(struct spider_net_card *card,
288 struct spider_net_descr_chain *chain)
289{
290 struct spider_net_descr *descr;
291
292 descr = chain->ring;
293 do {
294 descr->bus_addr = 0;
295 descr->hwdescr->next_descr_addr = 0;
296 descr = descr->next;
297 } while (descr != chain->ring);
298
299 dma_free_coherent(&card->pdev->dev, chain->num_desc,
300 chain->hwring, chain->dma_addr);
301}
302
303/**
304 * spider_net_init_chain - alloc and link descriptor chain
305 * @card: card structure
306 * @chain: address of chain
307 *
308 * We manage a circular list that mirrors the hardware structure,
309 * except that the hardware uses bus addresses.
310 *
311 * Returns 0 on success, <0 on failure
312 */
313static int
314spider_net_init_chain(struct spider_net_card *card,
315 struct spider_net_descr_chain *chain)
316{
317 int i;
318 struct spider_net_descr *descr;
319 struct spider_net_hw_descr *hwdescr;
320 dma_addr_t buf;
321 size_t alloc_size;
322
323 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
324
325 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
326 &chain->dma_addr, GFP_KERNEL);
327 if (!chain->hwring)
328 return -ENOMEM;
329
330 memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
331
332 /* Set up the hardware pointers in each descriptor */
333 descr = chain->ring;
334 hwdescr = chain->hwring;
335 buf = chain->dma_addr;
336 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
337 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
338 hwdescr->next_descr_addr = 0;
339
340 descr->hwdescr = hwdescr;
341 descr->bus_addr = buf;
342 descr->next = descr + 1;
343 descr->prev = descr - 1;
344
345 buf += sizeof(struct spider_net_hw_descr);
346 }
347 /* do actual circular list */
348 (descr-1)->next = chain->ring;
349 chain->ring->prev = descr-1;
350
351 spin_lock_init(&chain->lock);
352 chain->head = chain->ring;
353 chain->tail = chain->ring;
354 return 0;
355}
356
357/**
358 * spider_net_free_rx_chain_contents - frees descr contents in rx chain
359 * @card: card structure
360 *
361 * returns 0 on success, <0 on failure
362 */
363static void
364spider_net_free_rx_chain_contents(struct spider_net_card *card)
365{
366 struct spider_net_descr *descr;
367
368 descr = card->rx_chain.head;
369 do {
370 if (descr->skb) {
371 pci_unmap_single(card->pdev, descr->hwdescr->buf_addr,
372 SPIDER_NET_MAX_FRAME,
373 PCI_DMA_BIDIRECTIONAL);
374 dev_kfree_skb(descr->skb);
375 descr->skb = NULL;
376 }
377 descr = descr->next;
378 } while (descr != card->rx_chain.head);
379}
380
381/**
382 * spider_net_prepare_rx_descr - Reinitialize RX descriptor
383 * @card: card structure
384 * @descr: descriptor to re-init
385 *
386 * Return 0 on success, <0 on failure.
387 *
388 * Allocates a new rx skb, iommu-maps it and attaches it to the
389 * descriptor. Mark the descriptor as activated, ready-to-use.
390 */
391static int
392spider_net_prepare_rx_descr(struct spider_net_card *card,
393 struct spider_net_descr *descr)
394{
395 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
396 dma_addr_t buf;
397 int offset;
398 int bufsize;
399
400 /* we need to round up the buffer size to a multiple of 128 */
401 bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
402 (~(SPIDER_NET_RXBUF_ALIGN - 1));
403
404 /* and we need to have it 128 byte aligned, therefore we allocate a
405 * bit more */
406 /* allocate an skb */
407 descr->skb = netdev_alloc_skb(card->netdev,
408 bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
409 if (!descr->skb) {
410 if (netif_msg_rx_err(card) && net_ratelimit())
411 dev_err(&card->netdev->dev,
412 "Not enough memory to allocate rx buffer\n");
413 card->spider_stats.alloc_rx_skb_error++;
414 return -ENOMEM;
415 }
416 hwdescr->buf_size = bufsize;
417 hwdescr->result_size = 0;
418 hwdescr->valid_size = 0;
419 hwdescr->data_status = 0;
420 hwdescr->data_error = 0;
421
422 offset = ((unsigned long)descr->skb->data) &
423 (SPIDER_NET_RXBUF_ALIGN - 1);
424 if (offset)
425 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
426 /* iommu-map the skb */
427 buf = pci_map_single(card->pdev, descr->skb->data,
428 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
429 if (pci_dma_mapping_error(card->pdev, buf)) {
430 dev_kfree_skb_any(descr->skb);
431 descr->skb = NULL;
432 if (netif_msg_rx_err(card) && net_ratelimit())
433 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
434 card->spider_stats.rx_iommu_map_error++;
435 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
436 } else {
437 hwdescr->buf_addr = buf;
438 wmb();
439 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
440 SPIDER_NET_DMAC_NOINTR_COMPLETE;
441 }
442
443 return 0;
444}
445
446/**
447 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
448 * @card: card structure
449 *
450 * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
451 * chip by writing to the appropriate register. DMA is enabled in
452 * spider_net_enable_rxdmac.
453 */
454static inline void
455spider_net_enable_rxchtails(struct spider_net_card *card)
456{
457 /* assume chain is aligned correctly */
458 spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
459 card->rx_chain.tail->bus_addr);
460}
461
462/**
463 * spider_net_enable_rxdmac - enables a receive DMA controller
464 * @card: card structure
465 *
466 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
467 * in the GDADMACCNTR register
468 */
469static inline void
470spider_net_enable_rxdmac(struct spider_net_card *card)
471{
472 wmb();
473 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
474 SPIDER_NET_DMA_RX_VALUE);
475}
476
477/**
478 * spider_net_disable_rxdmac - disables the receive DMA controller
479 * @card: card structure
480 *
481 * spider_net_disable_rxdmac terminates processing on the DMA controller
482 * by turing off the DMA controller, with the force-end flag set.
483 */
484static inline void
485spider_net_disable_rxdmac(struct spider_net_card *card)
486{
487 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
488 SPIDER_NET_DMA_RX_FEND_VALUE);
489}
490
491/**
492 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
493 * @card: card structure
494 *
495 * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
496 */
497static void
498spider_net_refill_rx_chain(struct spider_net_card *card)
499{
500 struct spider_net_descr_chain *chain = &card->rx_chain;
501 unsigned long flags;
502
503 /* one context doing the refill (and a second context seeing that
504 * and omitting it) is ok. If called by NAPI, we'll be called again
505 * as spider_net_decode_one_descr is called several times. If some
506 * interrupt calls us, the NAPI is about to clean up anyway. */
507 if (!spin_trylock_irqsave(&chain->lock, flags))
508 return;
509
510 while (spider_net_get_descr_status(chain->head->hwdescr) ==
511 SPIDER_NET_DESCR_NOT_IN_USE) {
512 if (spider_net_prepare_rx_descr(card, chain->head))
513 break;
514 chain->head = chain->head->next;
515 }
516
517 spin_unlock_irqrestore(&chain->lock, flags);
518}
519
520/**
521 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
522 * @card: card structure
523 *
524 * Returns 0 on success, <0 on failure.
525 */
526static int
527spider_net_alloc_rx_skbs(struct spider_net_card *card)
528{
529 struct spider_net_descr_chain *chain = &card->rx_chain;
530 struct spider_net_descr *start = chain->tail;
531 struct spider_net_descr *descr = start;
532
533 /* Link up the hardware chain pointers */
534 do {
535 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
536 descr = descr->next;
537 } while (descr != start);
538
539 /* Put at least one buffer into the chain. if this fails,
540 * we've got a problem. If not, spider_net_refill_rx_chain
541 * will do the rest at the end of this function. */
542 if (spider_net_prepare_rx_descr(card, chain->head))
543 goto error;
544 else
545 chain->head = chain->head->next;
546
547 /* This will allocate the rest of the rx buffers;
548 * if not, it's business as usual later on. */
549 spider_net_refill_rx_chain(card);
550 spider_net_enable_rxdmac(card);
551 return 0;
552
553error:
554 spider_net_free_rx_chain_contents(card);
555 return -ENOMEM;
556}
557
558/**
559 * spider_net_get_multicast_hash - generates hash for multicast filter table
560 * @addr: multicast address
561 *
562 * returns the hash value.
563 *
564 * spider_net_get_multicast_hash calculates a hash value for a given multicast
565 * address, that is used to set the multicast filter tables
566 */
567static u8
568spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
569{
570 u32 crc;
571 u8 hash;
572 char addr_for_crc[ETH_ALEN] = { 0, };
573 int i, bit;
574
575 for (i = 0; i < ETH_ALEN * 8; i++) {
576 bit = (addr[i / 8] >> (i % 8)) & 1;
577 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
578 }
579
580 crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
581
582 hash = (crc >> 27);
583 hash <<= 3;
584 hash |= crc & 7;
585 hash &= 0xff;
586
587 return hash;
588}
589
590/**
591 * spider_net_set_multi - sets multicast addresses and promisc flags
592 * @netdev: interface device structure
593 *
594 * spider_net_set_multi configures multicast addresses as needed for the
595 * netdev interface. It also sets up multicast, allmulti and promisc
596 * flags appropriately
597 */
598static void
599spider_net_set_multi(struct net_device *netdev)
600{
601 struct netdev_hw_addr *ha;
602 u8 hash;
603 int i;
604 u32 reg;
605 struct spider_net_card *card = netdev_priv(netdev);
606 DECLARE_BITMAP(bitmask, SPIDER_NET_MULTICAST_HASHES) = {};
607
608 spider_net_set_promisc(card);
609
610 if (netdev->flags & IFF_ALLMULTI) {
611 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
612 set_bit(i, bitmask);
613 }
614 goto write_hash;
615 }
616
617 /* well, we know, what the broadcast hash value is: it's xfd
618 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
619 set_bit(0xfd, bitmask);
620
621 netdev_for_each_mc_addr(ha, netdev) {
622 hash = spider_net_get_multicast_hash(netdev, ha->addr);
623 set_bit(hash, bitmask);
624 }
625
626write_hash:
627 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
628 reg = 0;
629 if (test_bit(i * 4, bitmask))
630 reg += 0x08;
631 reg <<= 8;
632 if (test_bit(i * 4 + 1, bitmask))
633 reg += 0x08;
634 reg <<= 8;
635 if (test_bit(i * 4 + 2, bitmask))
636 reg += 0x08;
637 reg <<= 8;
638 if (test_bit(i * 4 + 3, bitmask))
639 reg += 0x08;
640
641 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
642 }
643}
644
645/**
646 * spider_net_prepare_tx_descr - fill tx descriptor with skb data
647 * @card: card structure
648 * @skb: packet to use
649 *
650 * returns 0 on success, <0 on failure.
651 *
652 * fills out the descriptor structure with skb data and len. Copies data,
653 * if needed (32bit DMA!)
654 */
655static int
656spider_net_prepare_tx_descr(struct spider_net_card *card,
657 struct sk_buff *skb)
658{
659 struct spider_net_descr_chain *chain = &card->tx_chain;
660 struct spider_net_descr *descr;
661 struct spider_net_hw_descr *hwdescr;
662 dma_addr_t buf;
663 unsigned long flags;
664
665 buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
666 if (pci_dma_mapping_error(card->pdev, buf)) {
667 if (netif_msg_tx_err(card) && net_ratelimit())
668 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
669 "Dropping packet\n", skb->data, skb->len);
670 card->spider_stats.tx_iommu_map_error++;
671 return -ENOMEM;
672 }
673
674 spin_lock_irqsave(&chain->lock, flags);
675 descr = card->tx_chain.head;
676 if (descr->next == chain->tail->prev) {
677 spin_unlock_irqrestore(&chain->lock, flags);
678 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE);
679 return -ENOMEM;
680 }
681 hwdescr = descr->hwdescr;
682 chain->head = descr->next;
683
684 descr->skb = skb;
685 hwdescr->buf_addr = buf;
686 hwdescr->buf_size = skb->len;
687 hwdescr->next_descr_addr = 0;
688 hwdescr->data_status = 0;
689
690 hwdescr->dmac_cmd_status =
691 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
692 spin_unlock_irqrestore(&chain->lock, flags);
693
694 if (skb->ip_summed == CHECKSUM_PARTIAL)
695 switch (ip_hdr(skb)->protocol) {
696 case IPPROTO_TCP:
697 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
698 break;
699 case IPPROTO_UDP:
700 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
701 break;
702 }
703
704 /* Chain the bus address, so that the DMA engine finds this descr. */
705 wmb();
706 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
707
708 netif_trans_update(card->netdev); /* set netdev watchdog timer */
709 return 0;
710}
711
712static int
713spider_net_set_low_watermark(struct spider_net_card *card)
714{
715 struct spider_net_descr *descr = card->tx_chain.tail;
716 struct spider_net_hw_descr *hwdescr;
717 unsigned long flags;
718 int status;
719 int cnt=0;
720 int i;
721
722 /* Measure the length of the queue. Measurement does not
723 * need to be precise -- does not need a lock. */
724 while (descr != card->tx_chain.head) {
725 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
726 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
727 break;
728 descr = descr->next;
729 cnt++;
730 }
731
732 /* If TX queue is short, don't even bother with interrupts */
733 if (cnt < card->tx_chain.num_desc/4)
734 return cnt;
735
736 /* Set low-watermark 3/4th's of the way into the queue. */
737 descr = card->tx_chain.tail;
738 cnt = (cnt*3)/4;
739 for (i=0;i<cnt; i++)
740 descr = descr->next;
741
742 /* Set the new watermark, clear the old watermark */
743 spin_lock_irqsave(&card->tx_chain.lock, flags);
744 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
745 if (card->low_watermark && card->low_watermark != descr) {
746 hwdescr = card->low_watermark->hwdescr;
747 hwdescr->dmac_cmd_status =
748 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
749 }
750 card->low_watermark = descr;
751 spin_unlock_irqrestore(&card->tx_chain.lock, flags);
752 return cnt;
753}
754
755/**
756 * spider_net_release_tx_chain - processes sent tx descriptors
757 * @card: adapter structure
758 * @brutal: if set, don't care about whether descriptor seems to be in use
759 *
760 * returns 0 if the tx ring is empty, otherwise 1.
761 *
762 * spider_net_release_tx_chain releases the tx descriptors that spider has
763 * finished with (if non-brutal) or simply release tx descriptors (if brutal).
764 * If some other context is calling this function, we return 1 so that we're
765 * scheduled again (if we were scheduled) and will not lose initiative.
766 */
767static int
768spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
769{
770 struct net_device *dev = card->netdev;
771 struct spider_net_descr_chain *chain = &card->tx_chain;
772 struct spider_net_descr *descr;
773 struct spider_net_hw_descr *hwdescr;
774 struct sk_buff *skb;
775 u32 buf_addr;
776 unsigned long flags;
777 int status;
778
779 while (1) {
780 spin_lock_irqsave(&chain->lock, flags);
781 if (chain->tail == chain->head) {
782 spin_unlock_irqrestore(&chain->lock, flags);
783 return 0;
784 }
785 descr = chain->tail;
786 hwdescr = descr->hwdescr;
787
788 status = spider_net_get_descr_status(hwdescr);
789 switch (status) {
790 case SPIDER_NET_DESCR_COMPLETE:
791 dev->stats.tx_packets++;
792 dev->stats.tx_bytes += descr->skb->len;
793 break;
794
795 case SPIDER_NET_DESCR_CARDOWNED:
796 if (!brutal) {
797 spin_unlock_irqrestore(&chain->lock, flags);
798 return 1;
799 }
800
801 /* fallthrough, if we release the descriptors
802 * brutally (then we don't care about
803 * SPIDER_NET_DESCR_CARDOWNED) */
804
805 case SPIDER_NET_DESCR_RESPONSE_ERROR:
806 case SPIDER_NET_DESCR_PROTECTION_ERROR:
807 case SPIDER_NET_DESCR_FORCE_END:
808 if (netif_msg_tx_err(card))
809 dev_err(&card->netdev->dev, "forcing end of tx descriptor "
810 "with status x%02x\n", status);
811 dev->stats.tx_errors++;
812 break;
813
814 default:
815 dev->stats.tx_dropped++;
816 if (!brutal) {
817 spin_unlock_irqrestore(&chain->lock, flags);
818 return 1;
819 }
820 }
821
822 chain->tail = descr->next;
823 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
824 skb = descr->skb;
825 descr->skb = NULL;
826 buf_addr = hwdescr->buf_addr;
827 spin_unlock_irqrestore(&chain->lock, flags);
828
829 /* unmap the skb */
830 if (skb) {
831 pci_unmap_single(card->pdev, buf_addr, skb->len,
832 PCI_DMA_TODEVICE);
833 dev_consume_skb_any(skb);
834 }
835 }
836 return 0;
837}
838
839/**
840 * spider_net_kick_tx_dma - enables TX DMA processing
841 * @card: card structure
842 *
843 * This routine will start the transmit DMA running if
844 * it is not already running. This routine ned only be
845 * called when queueing a new packet to an empty tx queue.
846 * Writes the current tx chain head as start address
847 * of the tx descriptor chain and enables the transmission
848 * DMA engine.
849 */
850static inline void
851spider_net_kick_tx_dma(struct spider_net_card *card)
852{
853 struct spider_net_descr *descr;
854
855 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
856 SPIDER_NET_TX_DMA_EN)
857 goto out;
858
859 descr = card->tx_chain.tail;
860 for (;;) {
861 if (spider_net_get_descr_status(descr->hwdescr) ==
862 SPIDER_NET_DESCR_CARDOWNED) {
863 spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
864 descr->bus_addr);
865 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
866 SPIDER_NET_DMA_TX_VALUE);
867 break;
868 }
869 if (descr == card->tx_chain.head)
870 break;
871 descr = descr->next;
872 }
873
874out:
875 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
876}
877
878/**
879 * spider_net_xmit - transmits a frame over the device
880 * @skb: packet to send out
881 * @netdev: interface device structure
882 *
883 * returns 0 on success, !0 on failure
884 */
885static int
886spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
887{
888 int cnt;
889 struct spider_net_card *card = netdev_priv(netdev);
890
891 spider_net_release_tx_chain(card, 0);
892
893 if (spider_net_prepare_tx_descr(card, skb) != 0) {
894 netdev->stats.tx_dropped++;
895 netif_stop_queue(netdev);
896 return NETDEV_TX_BUSY;
897 }
898
899 cnt = spider_net_set_low_watermark(card);
900 if (cnt < 5)
901 spider_net_kick_tx_dma(card);
902 return NETDEV_TX_OK;
903}
904
905/**
906 * spider_net_cleanup_tx_ring - cleans up the TX ring
907 * @card: card structure
908 *
909 * spider_net_cleanup_tx_ring is called by either the tx_timer
910 * or from the NAPI polling routine.
911 * This routine releases resources associted with transmitted
912 * packets, including updating the queue tail pointer.
913 */
914static void
915spider_net_cleanup_tx_ring(struct timer_list *t)
916{
917 struct spider_net_card *card = from_timer(card, t, tx_timer);
918 if ((spider_net_release_tx_chain(card, 0) != 0) &&
919 (card->netdev->flags & IFF_UP)) {
920 spider_net_kick_tx_dma(card);
921 netif_wake_queue(card->netdev);
922 }
923}
924
925/**
926 * spider_net_do_ioctl - called for device ioctls
927 * @netdev: interface device structure
928 * @ifr: request parameter structure for ioctl
929 * @cmd: command code for ioctl
930 *
931 * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
932 * -EOPNOTSUPP is returned, if an unknown ioctl was requested
933 */
934static int
935spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
936{
937 switch (cmd) {
938 default:
939 return -EOPNOTSUPP;
940 }
941}
942
943/**
944 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
945 * @descr: descriptor to process
946 * @card: card structure
947 *
948 * Fills out skb structure and passes the data to the stack.
949 * The descriptor state is not changed.
950 */
951static void
952spider_net_pass_skb_up(struct spider_net_descr *descr,
953 struct spider_net_card *card)
954{
955 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
956 struct sk_buff *skb = descr->skb;
957 struct net_device *netdev = card->netdev;
958 u32 data_status = hwdescr->data_status;
959 u32 data_error = hwdescr->data_error;
960
961 skb_put(skb, hwdescr->valid_size);
962
963 /* the card seems to add 2 bytes of junk in front
964 * of the ethernet frame */
965#define SPIDER_MISALIGN 2
966 skb_pull(skb, SPIDER_MISALIGN);
967 skb->protocol = eth_type_trans(skb, netdev);
968
969 /* checksum offload */
970 skb_checksum_none_assert(skb);
971 if (netdev->features & NETIF_F_RXCSUM) {
972 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
973 SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
974 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
975 skb->ip_summed = CHECKSUM_UNNECESSARY;
976 }
977
978 if (data_status & SPIDER_NET_VLAN_PACKET) {
979 /* further enhancements: HW-accel VLAN */
980 }
981
982 /* update netdevice statistics */
983 netdev->stats.rx_packets++;
984 netdev->stats.rx_bytes += skb->len;
985
986 /* pass skb up to stack */
987 netif_receive_skb(skb);
988}
989
990static void show_rx_chain(struct spider_net_card *card)
991{
992 struct spider_net_descr_chain *chain = &card->rx_chain;
993 struct spider_net_descr *start= chain->tail;
994 struct spider_net_descr *descr= start;
995 struct spider_net_hw_descr *hwd = start->hwdescr;
996 struct device *dev = &card->netdev->dev;
997 u32 curr_desc, next_desc;
998 int status;
999
1000 int tot = 0;
1001 int cnt = 0;
1002 int off = start - chain->ring;
1003 int cstat = hwd->dmac_cmd_status;
1004
1005 dev_info(dev, "Total number of descrs=%d\n",
1006 chain->num_desc);
1007 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
1008 off, cstat);
1009
1010 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
1011 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
1012
1013 status = cstat;
1014 do
1015 {
1016 hwd = descr->hwdescr;
1017 off = descr - chain->ring;
1018 status = hwd->dmac_cmd_status;
1019
1020 if (descr == chain->head)
1021 dev_info(dev, "Chain head is at %d, head status=0x%x\n",
1022 off, status);
1023
1024 if (curr_desc == descr->bus_addr)
1025 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
1026 off, status);
1027
1028 if (next_desc == descr->bus_addr)
1029 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
1030 off, status);
1031
1032 if (hwd->next_descr_addr == 0)
1033 dev_info(dev, "chain is cut at %d\n", off);
1034
1035 if (cstat != status) {
1036 int from = (chain->num_desc + off - cnt) % chain->num_desc;
1037 int to = (chain->num_desc + off - 1) % chain->num_desc;
1038 dev_info(dev, "Have %d (from %d to %d) descrs "
1039 "with stat=0x%08x\n", cnt, from, to, cstat);
1040 cstat = status;
1041 cnt = 0;
1042 }
1043
1044 cnt ++;
1045 tot ++;
1046 descr = descr->next;
1047 } while (descr != start);
1048
1049 dev_info(dev, "Last %d descrs with stat=0x%08x "
1050 "for a total of %d descrs\n", cnt, cstat, tot);
1051
1052#ifdef DEBUG
1053 /* Now dump the whole ring */
1054 descr = start;
1055 do
1056 {
1057 struct spider_net_hw_descr *hwd = descr->hwdescr;
1058 status = spider_net_get_descr_status(hwd);
1059 cnt = descr - chain->ring;
1060 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
1061 cnt, status, descr->skb);
1062 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
1063 descr->bus_addr, hwd->buf_addr, hwd->buf_size);
1064 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
1065 hwd->next_descr_addr, hwd->result_size,
1066 hwd->valid_size);
1067 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
1068 hwd->dmac_cmd_status, hwd->data_status,
1069 hwd->data_error);
1070 dev_info(dev, "\n");
1071
1072 descr = descr->next;
1073 } while (descr != start);
1074#endif
1075
1076}
1077
1078/**
1079 * spider_net_resync_head_ptr - Advance head ptr past empty descrs
1080 *
1081 * If the driver fails to keep up and empty the queue, then the
1082 * hardware wil run out of room to put incoming packets. This
1083 * will cause the hardware to skip descrs that are full (instead
1084 * of halting/retrying). Thus, once the driver runs, it wil need
1085 * to "catch up" to where the hardware chain pointer is at.
1086 */
1087static void spider_net_resync_head_ptr(struct spider_net_card *card)
1088{
1089 unsigned long flags;
1090 struct spider_net_descr_chain *chain = &card->rx_chain;
1091 struct spider_net_descr *descr;
1092 int i, status;
1093
1094 /* Advance head pointer past any empty descrs */
1095 descr = chain->head;
1096 status = spider_net_get_descr_status(descr->hwdescr);
1097
1098 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
1099 return;
1100
1101 spin_lock_irqsave(&chain->lock, flags);
1102
1103 descr = chain->head;
1104 status = spider_net_get_descr_status(descr->hwdescr);
1105 for (i=0; i<chain->num_desc; i++) {
1106 if (status != SPIDER_NET_DESCR_CARDOWNED) break;
1107 descr = descr->next;
1108 status = spider_net_get_descr_status(descr->hwdescr);
1109 }
1110 chain->head = descr;
1111
1112 spin_unlock_irqrestore(&chain->lock, flags);
1113}
1114
1115static int spider_net_resync_tail_ptr(struct spider_net_card *card)
1116{
1117 struct spider_net_descr_chain *chain = &card->rx_chain;
1118 struct spider_net_descr *descr;
1119 int i, status;
1120
1121 /* Advance tail pointer past any empty and reaped descrs */
1122 descr = chain->tail;
1123 status = spider_net_get_descr_status(descr->hwdescr);
1124
1125 for (i=0; i<chain->num_desc; i++) {
1126 if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
1127 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
1128 descr = descr->next;
1129 status = spider_net_get_descr_status(descr->hwdescr);
1130 }
1131 chain->tail = descr;
1132
1133 if ((i == chain->num_desc) || (i == 0))
1134 return 1;
1135 return 0;
1136}
1137
1138/**
1139 * spider_net_decode_one_descr - processes an RX descriptor
1140 * @card: card structure
1141 *
1142 * Returns 1 if a packet has been sent to the stack, otherwise 0.
1143 *
1144 * Processes an RX descriptor by iommu-unmapping the data buffer
1145 * and passing the packet up to the stack. This function is called
1146 * in softirq context, e.g. either bottom half from interrupt or
1147 * NAPI polling context.
1148 */
1149static int
1150spider_net_decode_one_descr(struct spider_net_card *card)
1151{
1152 struct net_device *dev = card->netdev;
1153 struct spider_net_descr_chain *chain = &card->rx_chain;
1154 struct spider_net_descr *descr = chain->tail;
1155 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
1156 u32 hw_buf_addr;
1157 int status;
1158
1159 status = spider_net_get_descr_status(hwdescr);
1160
1161 /* Nothing in the descriptor, or ring must be empty */
1162 if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
1163 (status == SPIDER_NET_DESCR_NOT_IN_USE))
1164 return 0;
1165
1166 /* descriptor definitively used -- move on tail */
1167 chain->tail = descr->next;
1168
1169 /* unmap descriptor */
1170 hw_buf_addr = hwdescr->buf_addr;
1171 hwdescr->buf_addr = 0xffffffff;
1172 pci_unmap_single(card->pdev, hw_buf_addr,
1173 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
1174
1175 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
1176 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
1177 (status == SPIDER_NET_DESCR_FORCE_END) ) {
1178 if (netif_msg_rx_err(card))
1179 dev_err(&dev->dev,
1180 "dropping RX descriptor with state %d\n", status);
1181 dev->stats.rx_dropped++;
1182 goto bad_desc;
1183 }
1184
1185 if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
1186 (status != SPIDER_NET_DESCR_FRAME_END) ) {
1187 if (netif_msg_rx_err(card))
1188 dev_err(&card->netdev->dev,
1189 "RX descriptor with unknown state %d\n", status);
1190 card->spider_stats.rx_desc_unk_state++;
1191 goto bad_desc;
1192 }
1193
1194 /* The cases we'll throw away the packet immediately */
1195 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
1196 if (netif_msg_rx_err(card))
1197 dev_err(&card->netdev->dev,
1198 "error in received descriptor found, "
1199 "data_status=x%08x, data_error=x%08x\n",
1200 hwdescr->data_status, hwdescr->data_error);
1201 goto bad_desc;
1202 }
1203
1204 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
1205 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
1206 hwdescr->dmac_cmd_status);
1207 pr_err("buf_addr=x%08x\n", hw_buf_addr);
1208 pr_err("buf_size=x%08x\n", hwdescr->buf_size);
1209 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
1210 pr_err("result_size=x%08x\n", hwdescr->result_size);
1211 pr_err("valid_size=x%08x\n", hwdescr->valid_size);
1212 pr_err("data_status=x%08x\n", hwdescr->data_status);
1213 pr_err("data_error=x%08x\n", hwdescr->data_error);
1214 pr_err("which=%ld\n", descr - card->rx_chain.ring);
1215
1216 card->spider_stats.rx_desc_error++;
1217 goto bad_desc;
1218 }
1219
1220 /* Ok, we've got a packet in descr */
1221 spider_net_pass_skb_up(descr, card);
1222 descr->skb = NULL;
1223 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1224 return 1;
1225
1226bad_desc:
1227 if (netif_msg_rx_err(card))
1228 show_rx_chain(card);
1229 dev_kfree_skb_irq(descr->skb);
1230 descr->skb = NULL;
1231 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1232 return 0;
1233}
1234
1235/**
1236 * spider_net_poll - NAPI poll function called by the stack to return packets
1237 * @netdev: interface device structure
1238 * @budget: number of packets we can pass to the stack at most
1239 *
1240 * returns 0 if no more packets available to the driver/stack. Returns 1,
1241 * if the quota is exceeded, but the driver has still packets.
1242 *
1243 * spider_net_poll returns all packets from the rx descriptors to the stack
1244 * (using netif_receive_skb). If all/enough packets are up, the driver
1245 * reenables interrupts and returns 0. If not, 1 is returned.
1246 */
1247static int spider_net_poll(struct napi_struct *napi, int budget)
1248{
1249 struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
1250 int packets_done = 0;
1251
1252 while (packets_done < budget) {
1253 if (!spider_net_decode_one_descr(card))
1254 break;
1255
1256 packets_done++;
1257 }
1258
1259 if ((packets_done == 0) && (card->num_rx_ints != 0)) {
1260 if (!spider_net_resync_tail_ptr(card))
1261 packets_done = budget;
1262 spider_net_resync_head_ptr(card);
1263 }
1264 card->num_rx_ints = 0;
1265
1266 spider_net_refill_rx_chain(card);
1267 spider_net_enable_rxdmac(card);
1268
1269 spider_net_cleanup_tx_ring(&card->tx_timer);
1270
1271 /* if all packets are in the stack, enable interrupts and return 0 */
1272 /* if not, return 1 */
1273 if (packets_done < budget) {
1274 napi_complete_done(napi, packets_done);
1275 spider_net_rx_irq_on(card);
1276 card->ignore_rx_ramfull = 0;
1277 }
1278
1279 return packets_done;
1280}
1281
1282/**
1283 * spider_net_set_mac - sets the MAC of an interface
1284 * @netdev: interface device structure
1285 * @ptr: pointer to new MAC address
1286 *
1287 * Returns 0 on success, <0 on failure. Currently, we don't support this
1288 * and will always return EOPNOTSUPP.
1289 */
1290static int
1291spider_net_set_mac(struct net_device *netdev, void *p)
1292{
1293 struct spider_net_card *card = netdev_priv(netdev);
1294 u32 macl, macu, regvalue;
1295 struct sockaddr *addr = p;
1296
1297 if (!is_valid_ether_addr(addr->sa_data))
1298 return -EADDRNOTAVAIL;
1299
1300 memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
1301
1302 /* switch off GMACTPE and GMACRPE */
1303 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1304 regvalue &= ~((1 << 5) | (1 << 6));
1305 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1306
1307 /* write mac */
1308 macu = (netdev->dev_addr[0]<<24) + (netdev->dev_addr[1]<<16) +
1309 (netdev->dev_addr[2]<<8) + (netdev->dev_addr[3]);
1310 macl = (netdev->dev_addr[4]<<8) + (netdev->dev_addr[5]);
1311 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
1312 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
1313
1314 /* switch GMACTPE and GMACRPE back on */
1315 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1316 regvalue |= ((1 << 5) | (1 << 6));
1317 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1318
1319 spider_net_set_promisc(card);
1320
1321 return 0;
1322}
1323
1324/**
1325 * spider_net_link_reset
1326 * @netdev: net device structure
1327 *
1328 * This is called when the PHY_LINK signal is asserted. For the blade this is
1329 * not connected so we should never get here.
1330 *
1331 */
1332static void
1333spider_net_link_reset(struct net_device *netdev)
1334{
1335
1336 struct spider_net_card *card = netdev_priv(netdev);
1337
1338 del_timer_sync(&card->aneg_timer);
1339
1340 /* clear interrupt, block further interrupts */
1341 spider_net_write_reg(card, SPIDER_NET_GMACST,
1342 spider_net_read_reg(card, SPIDER_NET_GMACST));
1343 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1344
1345 /* reset phy and setup aneg */
1346 card->aneg_count = 0;
1347 card->medium = BCM54XX_COPPER;
1348 spider_net_setup_aneg(card);
1349 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1350
1351}
1352
1353/**
1354 * spider_net_handle_error_irq - handles errors raised by an interrupt
1355 * @card: card structure
1356 * @status_reg: interrupt status register 0 (GHIINT0STS)
1357 *
1358 * spider_net_handle_error_irq treats or ignores all error conditions
1359 * found when an interrupt is presented
1360 */
1361static void
1362spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
1363 u32 error_reg1, u32 error_reg2)
1364{
1365 u32 i;
1366 int show_error = 1;
1367
1368 /* check GHIINT0STS ************************************/
1369 if (status_reg)
1370 for (i = 0; i < 32; i++)
1371 if (status_reg & (1<<i))
1372 switch (i)
1373 {
1374 /* let error_reg1 and error_reg2 evaluation decide, what to do
1375 case SPIDER_NET_PHYINT:
1376 case SPIDER_NET_GMAC2INT:
1377 case SPIDER_NET_GMAC1INT:
1378 case SPIDER_NET_GFIFOINT:
1379 case SPIDER_NET_DMACINT:
1380 case SPIDER_NET_GSYSINT:
1381 break; */
1382
1383 case SPIDER_NET_GIPSINT:
1384 show_error = 0;
1385 break;
1386
1387 case SPIDER_NET_GPWOPCMPINT:
1388 /* PHY write operation completed */
1389 show_error = 0;
1390 break;
1391 case SPIDER_NET_GPROPCMPINT:
1392 /* PHY read operation completed */
1393 /* we don't use semaphores, as we poll for the completion
1394 * of the read operation in spider_net_read_phy. Should take
1395 * about 50 us */
1396 show_error = 0;
1397 break;
1398 case SPIDER_NET_GPWFFINT:
1399 /* PHY command queue full */
1400 if (netif_msg_intr(card))
1401 dev_err(&card->netdev->dev, "PHY write queue full\n");
1402 show_error = 0;
1403 break;
1404
1405 /* case SPIDER_NET_GRMDADRINT: not used. print a message */
1406 /* case SPIDER_NET_GRMARPINT: not used. print a message */
1407 /* case SPIDER_NET_GRMMPINT: not used. print a message */
1408
1409 case SPIDER_NET_GDTDEN0INT:
1410 /* someone has set TX_DMA_EN to 0 */
1411 show_error = 0;
1412 break;
1413
1414 case SPIDER_NET_GDDDEN0INT: /* fallthrough */
1415 case SPIDER_NET_GDCDEN0INT: /* fallthrough */
1416 case SPIDER_NET_GDBDEN0INT: /* fallthrough */
1417 case SPIDER_NET_GDADEN0INT:
1418 /* someone has set RX_DMA_EN to 0 */
1419 show_error = 0;
1420 break;
1421
1422 /* RX interrupts */
1423 case SPIDER_NET_GDDFDCINT:
1424 case SPIDER_NET_GDCFDCINT:
1425 case SPIDER_NET_GDBFDCINT:
1426 case SPIDER_NET_GDAFDCINT:
1427 /* case SPIDER_NET_GDNMINT: not used. print a message */
1428 /* case SPIDER_NET_GCNMINT: not used. print a message */
1429 /* case SPIDER_NET_GBNMINT: not used. print a message */
1430 /* case SPIDER_NET_GANMINT: not used. print a message */
1431 /* case SPIDER_NET_GRFNMINT: not used. print a message */
1432 show_error = 0;
1433 break;
1434
1435 /* TX interrupts */
1436 case SPIDER_NET_GDTFDCINT:
1437 show_error = 0;
1438 break;
1439 case SPIDER_NET_GTTEDINT:
1440 show_error = 0;
1441 break;
1442 case SPIDER_NET_GDTDCEINT:
1443 /* chain end. If a descriptor should be sent, kick off
1444 * tx dma
1445 if (card->tx_chain.tail != card->tx_chain.head)
1446 spider_net_kick_tx_dma(card);
1447 */
1448 show_error = 0;
1449 break;
1450
1451 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
1452 /* case SPIDER_NET_GFREECNTINT: not used. print a message */
1453 }
1454
1455 /* check GHIINT1STS ************************************/
1456 if (error_reg1)
1457 for (i = 0; i < 32; i++)
1458 if (error_reg1 & (1<<i))
1459 switch (i)
1460 {
1461 case SPIDER_NET_GTMFLLINT:
1462 /* TX RAM full may happen on a usual case.
1463 * Logging is not needed. */
1464 show_error = 0;
1465 break;
1466 case SPIDER_NET_GRFDFLLINT: /* fallthrough */
1467 case SPIDER_NET_GRFCFLLINT: /* fallthrough */
1468 case SPIDER_NET_GRFBFLLINT: /* fallthrough */
1469 case SPIDER_NET_GRFAFLLINT: /* fallthrough */
1470 case SPIDER_NET_GRMFLLINT:
1471 /* Could happen when rx chain is full */
1472 if (card->ignore_rx_ramfull == 0) {
1473 card->ignore_rx_ramfull = 1;
1474 spider_net_resync_head_ptr(card);
1475 spider_net_refill_rx_chain(card);
1476 spider_net_enable_rxdmac(card);
1477 card->num_rx_ints ++;
1478 napi_schedule(&card->napi);
1479 }
1480 show_error = 0;
1481 break;
1482
1483 /* case SPIDER_NET_GTMSHTINT: problem, print a message */
1484 case SPIDER_NET_GDTINVDINT:
1485 /* allrighty. tx from previous descr ok */
1486 show_error = 0;
1487 break;
1488
1489 /* chain end */
1490 case SPIDER_NET_GDDDCEINT: /* fallthrough */
1491 case SPIDER_NET_GDCDCEINT: /* fallthrough */
1492 case SPIDER_NET_GDBDCEINT: /* fallthrough */
1493 case SPIDER_NET_GDADCEINT:
1494 spider_net_resync_head_ptr(card);
1495 spider_net_refill_rx_chain(card);
1496 spider_net_enable_rxdmac(card);
1497 card->num_rx_ints ++;
1498 napi_schedule(&card->napi);
1499 show_error = 0;
1500 break;
1501
1502 /* invalid descriptor */
1503 case SPIDER_NET_GDDINVDINT: /* fallthrough */
1504 case SPIDER_NET_GDCINVDINT: /* fallthrough */
1505 case SPIDER_NET_GDBINVDINT: /* fallthrough */
1506 case SPIDER_NET_GDAINVDINT:
1507 /* Could happen when rx chain is full */
1508 spider_net_resync_head_ptr(card);
1509 spider_net_refill_rx_chain(card);
1510 spider_net_enable_rxdmac(card);
1511 card->num_rx_ints ++;
1512 napi_schedule(&card->napi);
1513 show_error = 0;
1514 break;
1515
1516 /* case SPIDER_NET_GDTRSERINT: problem, print a message */
1517 /* case SPIDER_NET_GDDRSERINT: problem, print a message */
1518 /* case SPIDER_NET_GDCRSERINT: problem, print a message */
1519 /* case SPIDER_NET_GDBRSERINT: problem, print a message */
1520 /* case SPIDER_NET_GDARSERINT: problem, print a message */
1521 /* case SPIDER_NET_GDSERINT: problem, print a message */
1522 /* case SPIDER_NET_GDTPTERINT: problem, print a message */
1523 /* case SPIDER_NET_GDDPTERINT: problem, print a message */
1524 /* case SPIDER_NET_GDCPTERINT: problem, print a message */
1525 /* case SPIDER_NET_GDBPTERINT: problem, print a message */
1526 /* case SPIDER_NET_GDAPTERINT: problem, print a message */
1527 default:
1528 show_error = 1;
1529 break;
1530 }
1531
1532 /* check GHIINT2STS ************************************/
1533 if (error_reg2)
1534 for (i = 0; i < 32; i++)
1535 if (error_reg2 & (1<<i))
1536 switch (i)
1537 {
1538 /* there is nothing we can (want to) do at this time. Log a
1539 * message, we can switch on and off the specific values later on
1540 case SPIDER_NET_GPROPERINT:
1541 case SPIDER_NET_GMCTCRSNGINT:
1542 case SPIDER_NET_GMCTLCOLINT:
1543 case SPIDER_NET_GMCTTMOTINT:
1544 case SPIDER_NET_GMCRCAERINT:
1545 case SPIDER_NET_GMCRCALERINT:
1546 case SPIDER_NET_GMCRALNERINT:
1547 case SPIDER_NET_GMCROVRINT:
1548 case SPIDER_NET_GMCRRNTINT:
1549 case SPIDER_NET_GMCRRXERINT:
1550 case SPIDER_NET_GTITCSERINT:
1551 case SPIDER_NET_GTIFMTERINT:
1552 case SPIDER_NET_GTIPKTRVKINT:
1553 case SPIDER_NET_GTISPINGINT:
1554 case SPIDER_NET_GTISADNGINT:
1555 case SPIDER_NET_GTISPDNGINT:
1556 case SPIDER_NET_GRIFMTERINT:
1557 case SPIDER_NET_GRIPKTRVKINT:
1558 case SPIDER_NET_GRISPINGINT:
1559 case SPIDER_NET_GRISADNGINT:
1560 case SPIDER_NET_GRISPDNGINT:
1561 break;
1562 */
1563 default:
1564 break;
1565 }
1566
1567 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
1568 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
1569 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1570 status_reg, error_reg1, error_reg2);
1571
1572 /* clear interrupt sources */
1573 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
1574 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
1575}
1576
1577/**
1578 * spider_net_interrupt - interrupt handler for spider_net
1579 * @irq: interrupt number
1580 * @ptr: pointer to net_device
1581 *
1582 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
1583 * interrupt found raised by card.
1584 *
1585 * This is the interrupt handler, that turns off
1586 * interrupts for this device and makes the stack poll the driver
1587 */
1588static irqreturn_t
1589spider_net_interrupt(int irq, void *ptr)
1590{
1591 struct net_device *netdev = ptr;
1592 struct spider_net_card *card = netdev_priv(netdev);
1593 u32 status_reg, error_reg1, error_reg2;
1594
1595 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
1596 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
1597 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
1598
1599 if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
1600 !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
1601 !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
1602 return IRQ_NONE;
1603
1604 if (status_reg & SPIDER_NET_RXINT ) {
1605 spider_net_rx_irq_off(card);
1606 napi_schedule(&card->napi);
1607 card->num_rx_ints ++;
1608 }
1609 if (status_reg & SPIDER_NET_TXINT)
1610 napi_schedule(&card->napi);
1611
1612 if (status_reg & SPIDER_NET_LINKINT)
1613 spider_net_link_reset(netdev);
1614
1615 if (status_reg & SPIDER_NET_ERRINT )
1616 spider_net_handle_error_irq(card, status_reg,
1617 error_reg1, error_reg2);
1618
1619 /* clear interrupt sources */
1620 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
1621
1622 return IRQ_HANDLED;
1623}
1624
1625#ifdef CONFIG_NET_POLL_CONTROLLER
1626/**
1627 * spider_net_poll_controller - artificial interrupt for netconsole etc.
1628 * @netdev: interface device structure
1629 *
1630 * see Documentation/networking/netconsole.txt
1631 */
1632static void
1633spider_net_poll_controller(struct net_device *netdev)
1634{
1635 disable_irq(netdev->irq);
1636 spider_net_interrupt(netdev->irq, netdev);
1637 enable_irq(netdev->irq);
1638}
1639#endif /* CONFIG_NET_POLL_CONTROLLER */
1640
1641/**
1642 * spider_net_enable_interrupts - enable interrupts
1643 * @card: card structure
1644 *
1645 * spider_net_enable_interrupt enables several interrupts
1646 */
1647static void
1648spider_net_enable_interrupts(struct spider_net_card *card)
1649{
1650 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
1651 SPIDER_NET_INT0_MASK_VALUE);
1652 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
1653 SPIDER_NET_INT1_MASK_VALUE);
1654 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
1655 SPIDER_NET_INT2_MASK_VALUE);
1656}
1657
1658/**
1659 * spider_net_disable_interrupts - disable interrupts
1660 * @card: card structure
1661 *
1662 * spider_net_disable_interrupts disables all the interrupts
1663 */
1664static void
1665spider_net_disable_interrupts(struct spider_net_card *card)
1666{
1667 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
1668 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
1669 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
1670 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1671}
1672
1673/**
1674 * spider_net_init_card - initializes the card
1675 * @card: card structure
1676 *
1677 * spider_net_init_card initializes the card so that other registers can
1678 * be used
1679 */
1680static void
1681spider_net_init_card(struct spider_net_card *card)
1682{
1683 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1684 SPIDER_NET_CKRCTRL_STOP_VALUE);
1685
1686 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1687 SPIDER_NET_CKRCTRL_RUN_VALUE);
1688
1689 /* trigger ETOMOD signal */
1690 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1691 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
1692
1693 spider_net_disable_interrupts(card);
1694}
1695
1696/**
1697 * spider_net_enable_card - enables the card by setting all kinds of regs
1698 * @card: card structure
1699 *
1700 * spider_net_enable_card sets a lot of SMMIO registers to enable the device
1701 */
1702static void
1703spider_net_enable_card(struct spider_net_card *card)
1704{
1705 int i;
1706 /* the following array consists of (register),(value) pairs
1707 * that are set in this function. A register of 0 ends the list */
1708 u32 regs[][2] = {
1709 { SPIDER_NET_GRESUMINTNUM, 0 },
1710 { SPIDER_NET_GREINTNUM, 0 },
1711
1712 /* set interrupt frame number registers */
1713 /* clear the single DMA engine registers first */
1714 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1715 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1716 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1717 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1718 /* then set, what we really need */
1719 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
1720
1721 /* timer counter registers and stuff */
1722 { SPIDER_NET_GFREECNNUM, 0 },
1723 { SPIDER_NET_GONETIMENUM, 0 },
1724 { SPIDER_NET_GTOUTFRMNUM, 0 },
1725
1726 /* RX mode setting */
1727 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
1728 /* TX mode setting */
1729 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
1730 /* IPSEC mode setting */
1731 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
1732
1733 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
1734
1735 { SPIDER_NET_GMRWOLCTRL, 0 },
1736 { SPIDER_NET_GTESTMD, 0x10000000 },
1737 { SPIDER_NET_GTTQMSK, 0x00400040 },
1738
1739 { SPIDER_NET_GMACINTEN, 0 },
1740
1741 /* flow control stuff */
1742 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
1743 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
1744
1745 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
1746 { 0, 0}
1747 };
1748
1749 i = 0;
1750 while (regs[i][0]) {
1751 spider_net_write_reg(card, regs[i][0], regs[i][1]);
1752 i++;
1753 }
1754
1755 /* clear unicast filter table entries 1 to 14 */
1756 for (i = 1; i <= 14; i++) {
1757 spider_net_write_reg(card,
1758 SPIDER_NET_GMRUAFILnR + i * 8,
1759 0x00080000);
1760 spider_net_write_reg(card,
1761 SPIDER_NET_GMRUAFILnR + i * 8 + 4,
1762 0x00000000);
1763 }
1764
1765 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
1766
1767 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
1768
1769 /* set chain tail address for RX chains and
1770 * enable DMA */
1771 spider_net_enable_rxchtails(card);
1772 spider_net_enable_rxdmac(card);
1773
1774 spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
1775
1776 spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
1777 SPIDER_NET_LENLMT_VALUE);
1778 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1779 SPIDER_NET_OPMODE_VALUE);
1780
1781 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
1782 SPIDER_NET_GDTBSTA);
1783}
1784
1785/**
1786 * spider_net_download_firmware - loads firmware into the adapter
1787 * @card: card structure
1788 * @firmware_ptr: pointer to firmware data
1789 *
1790 * spider_net_download_firmware loads the firmware data into the
1791 * adapter. It assumes the length etc. to be allright.
1792 */
1793static int
1794spider_net_download_firmware(struct spider_net_card *card,
1795 const void *firmware_ptr)
1796{
1797 int sequencer, i;
1798 const u32 *fw_ptr = firmware_ptr;
1799
1800 /* stop sequencers */
1801 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1802 SPIDER_NET_STOP_SEQ_VALUE);
1803
1804 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
1805 sequencer++) {
1806 spider_net_write_reg(card,
1807 SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
1808 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1809 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
1810 sequencer * 8, *fw_ptr);
1811 fw_ptr++;
1812 }
1813 }
1814
1815 if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
1816 return -EIO;
1817
1818 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1819 SPIDER_NET_RUN_SEQ_VALUE);
1820
1821 return 0;
1822}
1823
1824/**
1825 * spider_net_init_firmware - reads in firmware parts
1826 * @card: card structure
1827 *
1828 * Returns 0 on success, <0 on failure
1829 *
1830 * spider_net_init_firmware opens the sequencer firmware and does some basic
1831 * checks. This function opens and releases the firmware structure. A call
1832 * to download the firmware is performed before the release.
1833 *
1834 * Firmware format
1835 * ===============
1836 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
1837 * the program for each sequencer. Use the command
1838 * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \
1839 * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \
1840 * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
1841 *
1842 * to generate spider_fw.bin, if you have sequencer programs with something
1843 * like the following contents for each sequencer:
1844 * <ONE LINE COMMENT>
1845 * <FIRST 4-BYTES-WORD FOR SEQUENCER>
1846 * <SECOND 4-BYTES-WORD FOR SEQUENCER>
1847 * ...
1848 * <1024th 4-BYTES-WORD FOR SEQUENCER>
1849 */
1850static int
1851spider_net_init_firmware(struct spider_net_card *card)
1852{
1853 struct firmware *firmware = NULL;
1854 struct device_node *dn;
1855 const u8 *fw_prop = NULL;
1856 int err = -ENOENT;
1857 int fw_size;
1858
1859 if (request_firmware((const struct firmware **)&firmware,
1860 SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
1861 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
1862 netif_msg_probe(card) ) {
1863 dev_err(&card->netdev->dev,
1864 "Incorrect size of spidernet firmware in " \
1865 "filesystem. Looking in host firmware...\n");
1866 goto try_host_fw;
1867 }
1868 err = spider_net_download_firmware(card, firmware->data);
1869
1870 release_firmware(firmware);
1871 if (err)
1872 goto try_host_fw;
1873
1874 goto done;
1875 }
1876
1877try_host_fw:
1878 dn = pci_device_to_OF_node(card->pdev);
1879 if (!dn)
1880 goto out_err;
1881
1882 fw_prop = of_get_property(dn, "firmware", &fw_size);
1883 if (!fw_prop)
1884 goto out_err;
1885
1886 if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
1887 netif_msg_probe(card) ) {
1888 dev_err(&card->netdev->dev,
1889 "Incorrect size of spidernet firmware in host firmware\n");
1890 goto done;
1891 }
1892
1893 err = spider_net_download_firmware(card, fw_prop);
1894
1895done:
1896 return err;
1897out_err:
1898 if (netif_msg_probe(card))
1899 dev_err(&card->netdev->dev,
1900 "Couldn't find spidernet firmware in filesystem " \
1901 "or host firmware\n");
1902 return err;
1903}
1904
1905/**
1906 * spider_net_open - called upon ifonfig up
1907 * @netdev: interface device structure
1908 *
1909 * returns 0 on success, <0 on failure
1910 *
1911 * spider_net_open allocates all the descriptors and memory needed for
1912 * operation, sets up multicast list and enables interrupts
1913 */
1914int
1915spider_net_open(struct net_device *netdev)
1916{
1917 struct spider_net_card *card = netdev_priv(netdev);
1918 int result;
1919
1920 result = spider_net_init_firmware(card);
1921 if (result)
1922 goto init_firmware_failed;
1923
1924 /* start probing with copper */
1925 card->aneg_count = 0;
1926 card->medium = BCM54XX_COPPER;
1927 spider_net_setup_aneg(card);
1928 if (card->phy.def->phy_id)
1929 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1930
1931 result = spider_net_init_chain(card, &card->tx_chain);
1932 if (result)
1933 goto alloc_tx_failed;
1934 card->low_watermark = NULL;
1935
1936 result = spider_net_init_chain(card, &card->rx_chain);
1937 if (result)
1938 goto alloc_rx_failed;
1939
1940 /* Allocate rx skbs */
1941 result = spider_net_alloc_rx_skbs(card);
1942 if (result)
1943 goto alloc_skbs_failed;
1944
1945 spider_net_set_multi(netdev);
1946
1947 /* further enhancement: setup hw vlan, if needed */
1948
1949 result = -EBUSY;
1950 if (request_irq(netdev->irq, spider_net_interrupt,
1951 IRQF_SHARED, netdev->name, netdev))
1952 goto register_int_failed;
1953
1954 spider_net_enable_card(card);
1955
1956 netif_start_queue(netdev);
1957 netif_carrier_on(netdev);
1958 napi_enable(&card->napi);
1959
1960 spider_net_enable_interrupts(card);
1961
1962 return 0;
1963
1964register_int_failed:
1965 spider_net_free_rx_chain_contents(card);
1966alloc_skbs_failed:
1967 spider_net_free_chain(card, &card->rx_chain);
1968alloc_rx_failed:
1969 spider_net_free_chain(card, &card->tx_chain);
1970alloc_tx_failed:
1971 del_timer_sync(&card->aneg_timer);
1972init_firmware_failed:
1973 return result;
1974}
1975
1976/**
1977 * spider_net_link_phy
1978 * @data: used for pointer to card structure
1979 *
1980 */
1981static void spider_net_link_phy(struct timer_list *t)
1982{
1983 struct spider_net_card *card = from_timer(card, t, aneg_timer);
1984 struct mii_phy *phy = &card->phy;
1985
1986 /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
1987 if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
1988
1989 pr_debug("%s: link is down trying to bring it up\n",
1990 card->netdev->name);
1991
1992 switch (card->medium) {
1993 case BCM54XX_COPPER:
1994 /* enable fiber with autonegotiation first */
1995 if (phy->def->ops->enable_fiber)
1996 phy->def->ops->enable_fiber(phy, 1);
1997 card->medium = BCM54XX_FIBER;
1998 break;
1999
2000 case BCM54XX_FIBER:
2001 /* fiber didn't come up, try to disable fiber autoneg */
2002 if (phy->def->ops->enable_fiber)
2003 phy->def->ops->enable_fiber(phy, 0);
2004 card->medium = BCM54XX_UNKNOWN;
2005 break;
2006
2007 case BCM54XX_UNKNOWN:
2008 /* copper, fiber with and without failed,
2009 * retry from beginning */
2010 spider_net_setup_aneg(card);
2011 card->medium = BCM54XX_COPPER;
2012 break;
2013 }
2014
2015 card->aneg_count = 0;
2016 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2017 return;
2018 }
2019
2020 /* link still not up, try again later */
2021 if (!(phy->def->ops->poll_link(phy))) {
2022 card->aneg_count++;
2023 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2024 return;
2025 }
2026
2027 /* link came up, get abilities */
2028 phy->def->ops->read_link(phy);
2029
2030 spider_net_write_reg(card, SPIDER_NET_GMACST,
2031 spider_net_read_reg(card, SPIDER_NET_GMACST));
2032 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
2033
2034 if (phy->speed == 1000)
2035 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
2036 else
2037 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
2038
2039 card->aneg_count = 0;
2040
2041 pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n",
2042 card->netdev->name, phy->speed,
2043 phy->duplex == 1 ? "Full" : "Half",
2044 phy->autoneg == 1 ? "" : "no ");
2045}
2046
2047/**
2048 * spider_net_setup_phy - setup PHY
2049 * @card: card structure
2050 *
2051 * returns 0 on success, <0 on failure
2052 *
2053 * spider_net_setup_phy is used as part of spider_net_probe.
2054 **/
2055static int
2056spider_net_setup_phy(struct spider_net_card *card)
2057{
2058 struct mii_phy *phy = &card->phy;
2059
2060 spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
2061 SPIDER_NET_DMASEL_VALUE);
2062 spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
2063 SPIDER_NET_PHY_CTRL_VALUE);
2064
2065 phy->dev = card->netdev;
2066 phy->mdio_read = spider_net_read_phy;
2067 phy->mdio_write = spider_net_write_phy;
2068
2069 for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
2070 unsigned short id;
2071 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
2072 if (id != 0x0000 && id != 0xffff) {
2073 if (!sungem_phy_probe(phy, phy->mii_id)) {
2074 pr_info("Found %s.\n", phy->def->name);
2075 break;
2076 }
2077 }
2078 }
2079
2080 return 0;
2081}
2082
2083/**
2084 * spider_net_workaround_rxramfull - work around firmware bug
2085 * @card: card structure
2086 *
2087 * no return value
2088 **/
2089static void
2090spider_net_workaround_rxramfull(struct spider_net_card *card)
2091{
2092 int i, sequencer = 0;
2093
2094 /* cancel reset */
2095 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2096 SPIDER_NET_CKRCTRL_RUN_VALUE);
2097
2098 /* empty sequencer data */
2099 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
2100 sequencer++) {
2101 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
2102 sequencer * 8, 0x0);
2103 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
2104 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
2105 sequencer * 8, 0x0);
2106 }
2107 }
2108
2109 /* set sequencer operation */
2110 spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
2111
2112 /* reset */
2113 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2114 SPIDER_NET_CKRCTRL_STOP_VALUE);
2115}
2116
2117/**
2118 * spider_net_stop - called upon ifconfig down
2119 * @netdev: interface device structure
2120 *
2121 * always returns 0
2122 */
2123int
2124spider_net_stop(struct net_device *netdev)
2125{
2126 struct spider_net_card *card = netdev_priv(netdev);
2127
2128 napi_disable(&card->napi);
2129 netif_carrier_off(netdev);
2130 netif_stop_queue(netdev);
2131 del_timer_sync(&card->tx_timer);
2132 del_timer_sync(&card->aneg_timer);
2133
2134 spider_net_disable_interrupts(card);
2135
2136 free_irq(netdev->irq, netdev);
2137
2138 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
2139 SPIDER_NET_DMA_TX_FEND_VALUE);
2140
2141 /* turn off DMA, force end */
2142 spider_net_disable_rxdmac(card);
2143
2144 /* release chains */
2145 spider_net_release_tx_chain(card, 1);
2146 spider_net_free_rx_chain_contents(card);
2147
2148 spider_net_free_chain(card, &card->tx_chain);
2149 spider_net_free_chain(card, &card->rx_chain);
2150
2151 return 0;
2152}
2153
2154/**
2155 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
2156 * function (to be called not under interrupt status)
2157 * @data: data, is interface device structure
2158 *
2159 * called as task when tx hangs, resets interface (if interface is up)
2160 */
2161static void
2162spider_net_tx_timeout_task(struct work_struct *work)
2163{
2164 struct spider_net_card *card =
2165 container_of(work, struct spider_net_card, tx_timeout_task);
2166 struct net_device *netdev = card->netdev;
2167
2168 if (!(netdev->flags & IFF_UP))
2169 goto out;
2170
2171 netif_device_detach(netdev);
2172 spider_net_stop(netdev);
2173
2174 spider_net_workaround_rxramfull(card);
2175 spider_net_init_card(card);
2176
2177 if (spider_net_setup_phy(card))
2178 goto out;
2179
2180 spider_net_open(netdev);
2181 spider_net_kick_tx_dma(card);
2182 netif_device_attach(netdev);
2183
2184out:
2185 atomic_dec(&card->tx_timeout_task_counter);
2186}
2187
2188/**
2189 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
2190 * @netdev: interface device structure
2191 *
2192 * called, if tx hangs. Schedules a task that resets the interface
2193 */
2194static void
2195spider_net_tx_timeout(struct net_device *netdev)
2196{
2197 struct spider_net_card *card;
2198
2199 card = netdev_priv(netdev);
2200 atomic_inc(&card->tx_timeout_task_counter);
2201 if (netdev->flags & IFF_UP)
2202 schedule_work(&card->tx_timeout_task);
2203 else
2204 atomic_dec(&card->tx_timeout_task_counter);
2205 card->spider_stats.tx_timeouts++;
2206}
2207
2208static const struct net_device_ops spider_net_ops = {
2209 .ndo_open = spider_net_open,
2210 .ndo_stop = spider_net_stop,
2211 .ndo_start_xmit = spider_net_xmit,
2212 .ndo_set_rx_mode = spider_net_set_multi,
2213 .ndo_set_mac_address = spider_net_set_mac,
2214 .ndo_do_ioctl = spider_net_do_ioctl,
2215 .ndo_tx_timeout = spider_net_tx_timeout,
2216 .ndo_validate_addr = eth_validate_addr,
2217 /* HW VLAN */
2218#ifdef CONFIG_NET_POLL_CONTROLLER
2219 /* poll controller */
2220 .ndo_poll_controller = spider_net_poll_controller,
2221#endif /* CONFIG_NET_POLL_CONTROLLER */
2222};
2223
2224/**
2225 * spider_net_setup_netdev_ops - initialization of net_device operations
2226 * @netdev: net_device structure
2227 *
2228 * fills out function pointers in the net_device structure
2229 */
2230static void
2231spider_net_setup_netdev_ops(struct net_device *netdev)
2232{
2233 netdev->netdev_ops = &spider_net_ops;
2234 netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
2235 /* ethtool ops */
2236 netdev->ethtool_ops = &spider_net_ethtool_ops;
2237}
2238
2239/**
2240 * spider_net_setup_netdev - initialization of net_device
2241 * @card: card structure
2242 *
2243 * Returns 0 on success or <0 on failure
2244 *
2245 * spider_net_setup_netdev initializes the net_device structure
2246 **/
2247static int
2248spider_net_setup_netdev(struct spider_net_card *card)
2249{
2250 int result;
2251 struct net_device *netdev = card->netdev;
2252 struct device_node *dn;
2253 struct sockaddr addr;
2254 const u8 *mac;
2255
2256 SET_NETDEV_DEV(netdev, &card->pdev->dev);
2257
2258 pci_set_drvdata(card->pdev, netdev);
2259
2260 timer_setup(&card->tx_timer, spider_net_cleanup_tx_ring, 0);
2261 netdev->irq = card->pdev->irq;
2262
2263 card->aneg_count = 0;
2264 timer_setup(&card->aneg_timer, spider_net_link_phy, 0);
2265
2266 netif_napi_add(netdev, &card->napi,
2267 spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
2268
2269 spider_net_setup_netdev_ops(netdev);
2270
2271 netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
2272 if (SPIDER_NET_RX_CSUM_DEFAULT)
2273 netdev->features |= NETIF_F_RXCSUM;
2274 netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
2275 /* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
2276 * NETIF_F_HW_VLAN_CTAG_FILTER */
2277
2278 /* MTU range: 64 - 2294 */
2279 netdev->min_mtu = SPIDER_NET_MIN_MTU;
2280 netdev->max_mtu = SPIDER_NET_MAX_MTU;
2281
2282 netdev->irq = card->pdev->irq;
2283 card->num_rx_ints = 0;
2284 card->ignore_rx_ramfull = 0;
2285
2286 dn = pci_device_to_OF_node(card->pdev);
2287 if (!dn)
2288 return -EIO;
2289
2290 mac = of_get_property(dn, "local-mac-address", NULL);
2291 if (!mac)
2292 return -EIO;
2293 memcpy(addr.sa_data, mac, ETH_ALEN);
2294
2295 result = spider_net_set_mac(netdev, &addr);
2296 if ((result) && (netif_msg_probe(card)))
2297 dev_err(&card->netdev->dev,
2298 "Failed to set MAC address: %i\n", result);
2299
2300 result = register_netdev(netdev);
2301 if (result) {
2302 if (netif_msg_probe(card))
2303 dev_err(&card->netdev->dev,
2304 "Couldn't register net_device: %i\n", result);
2305 return result;
2306 }
2307
2308 if (netif_msg_probe(card))
2309 pr_info("Initialized device %s.\n", netdev->name);
2310
2311 return 0;
2312}
2313
2314/**
2315 * spider_net_alloc_card - allocates net_device and card structure
2316 *
2317 * returns the card structure or NULL in case of errors
2318 *
2319 * the card and net_device structures are linked to each other
2320 */
2321static struct spider_net_card *
2322spider_net_alloc_card(void)
2323{
2324 struct net_device *netdev;
2325 struct spider_net_card *card;
2326 size_t alloc_size;
2327
2328 alloc_size = sizeof(struct spider_net_card) +
2329 (tx_descriptors + rx_descriptors) * sizeof(struct spider_net_descr);
2330 netdev = alloc_etherdev(alloc_size);
2331 if (!netdev)
2332 return NULL;
2333
2334 card = netdev_priv(netdev);
2335 card->netdev = netdev;
2336 card->msg_enable = SPIDER_NET_DEFAULT_MSG;
2337 INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
2338 init_waitqueue_head(&card->waitq);
2339 atomic_set(&card->tx_timeout_task_counter, 0);
2340
2341 card->rx_chain.num_desc = rx_descriptors;
2342 card->rx_chain.ring = card->darray;
2343 card->tx_chain.num_desc = tx_descriptors;
2344 card->tx_chain.ring = card->darray + rx_descriptors;
2345
2346 return card;
2347}
2348
2349/**
2350 * spider_net_undo_pci_setup - releases PCI ressources
2351 * @card: card structure
2352 *
2353 * spider_net_undo_pci_setup releases the mapped regions
2354 */
2355static void
2356spider_net_undo_pci_setup(struct spider_net_card *card)
2357{
2358 iounmap(card->regs);
2359 pci_release_regions(card->pdev);
2360}
2361
2362/**
2363 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
2364 * @pdev: PCI device
2365 *
2366 * Returns the card structure or NULL if any errors occur
2367 *
2368 * spider_net_setup_pci_dev initializes pdev and together with the
2369 * functions called in spider_net_open configures the device so that
2370 * data can be transferred over it
2371 * The net_device structure is attached to the card structure, if the
2372 * function returns without error.
2373 **/
2374static struct spider_net_card *
2375spider_net_setup_pci_dev(struct pci_dev *pdev)
2376{
2377 struct spider_net_card *card;
2378 unsigned long mmio_start, mmio_len;
2379
2380 if (pci_enable_device(pdev)) {
2381 dev_err(&pdev->dev, "Couldn't enable PCI device\n");
2382 return NULL;
2383 }
2384
2385 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
2386 dev_err(&pdev->dev,
2387 "Couldn't find proper PCI device base address.\n");
2388 goto out_disable_dev;
2389 }
2390
2391 if (pci_request_regions(pdev, spider_net_driver_name)) {
2392 dev_err(&pdev->dev,
2393 "Couldn't obtain PCI resources, aborting.\n");
2394 goto out_disable_dev;
2395 }
2396
2397 pci_set_master(pdev);
2398
2399 card = spider_net_alloc_card();
2400 if (!card) {
2401 dev_err(&pdev->dev,
2402 "Couldn't allocate net_device structure, aborting.\n");
2403 goto out_release_regions;
2404 }
2405 card->pdev = pdev;
2406
2407 /* fetch base address and length of first resource */
2408 mmio_start = pci_resource_start(pdev, 0);
2409 mmio_len = pci_resource_len(pdev, 0);
2410
2411 card->netdev->mem_start = mmio_start;
2412 card->netdev->mem_end = mmio_start + mmio_len;
2413 card->regs = ioremap(mmio_start, mmio_len);
2414
2415 if (!card->regs) {
2416 dev_err(&pdev->dev,
2417 "Couldn't obtain PCI resources, aborting.\n");
2418 goto out_release_regions;
2419 }
2420
2421 return card;
2422
2423out_release_regions:
2424 pci_release_regions(pdev);
2425out_disable_dev:
2426 pci_disable_device(pdev);
2427 return NULL;
2428}
2429
2430/**
2431 * spider_net_probe - initialization of a device
2432 * @pdev: PCI device
2433 * @ent: entry in the device id list
2434 *
2435 * Returns 0 on success, <0 on failure
2436 *
2437 * spider_net_probe initializes pdev and registers a net_device
2438 * structure for it. After that, the device can be ifconfig'ed up
2439 **/
2440static int
2441spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2442{
2443 int err = -EIO;
2444 struct spider_net_card *card;
2445
2446 card = spider_net_setup_pci_dev(pdev);
2447 if (!card)
2448 goto out;
2449
2450 spider_net_workaround_rxramfull(card);
2451 spider_net_init_card(card);
2452
2453 err = spider_net_setup_phy(card);
2454 if (err)
2455 goto out_undo_pci;
2456
2457 err = spider_net_setup_netdev(card);
2458 if (err)
2459 goto out_undo_pci;
2460
2461 return 0;
2462
2463out_undo_pci:
2464 spider_net_undo_pci_setup(card);
2465 free_netdev(card->netdev);
2466out:
2467 return err;
2468}
2469
2470/**
2471 * spider_net_remove - removal of a device
2472 * @pdev: PCI device
2473 *
2474 * Returns 0 on success, <0 on failure
2475 *
2476 * spider_net_remove is called to remove the device and unregisters the
2477 * net_device
2478 **/
2479static void
2480spider_net_remove(struct pci_dev *pdev)
2481{
2482 struct net_device *netdev;
2483 struct spider_net_card *card;
2484
2485 netdev = pci_get_drvdata(pdev);
2486 card = netdev_priv(netdev);
2487
2488 wait_event(card->waitq,
2489 atomic_read(&card->tx_timeout_task_counter) == 0);
2490
2491 unregister_netdev(netdev);
2492
2493 /* switch off card */
2494 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2495 SPIDER_NET_CKRCTRL_STOP_VALUE);
2496 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2497 SPIDER_NET_CKRCTRL_RUN_VALUE);
2498
2499 spider_net_undo_pci_setup(card);
2500 free_netdev(netdev);
2501}
2502
2503static struct pci_driver spider_net_driver = {
2504 .name = spider_net_driver_name,
2505 .id_table = spider_net_pci_tbl,
2506 .probe = spider_net_probe,
2507 .remove = spider_net_remove
2508};
2509
2510/**
2511 * spider_net_init - init function when the driver is loaded
2512 *
2513 * spider_net_init registers the device driver
2514 */
2515static int __init spider_net_init(void)
2516{
2517 printk(KERN_INFO "Spidernet version %s.\n", VERSION);
2518
2519 if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
2520 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
2521 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2522 }
2523 if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
2524 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
2525 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2526 }
2527 if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
2528 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
2529 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2530 }
2531 if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
2532 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
2533 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2534 }
2535
2536 return pci_register_driver(&spider_net_driver);
2537}
2538
2539/**
2540 * spider_net_cleanup - exit function when driver is unloaded
2541 *
2542 * spider_net_cleanup unregisters the device driver
2543 */
2544static void __exit spider_net_cleanup(void)
2545{
2546 pci_unregister_driver(&spider_net_driver);
2547}
2548
2549module_init(spider_net_init);
2550module_exit(spider_net_cleanup);