Loading...
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 <asm/pci-bridge.h>
52#include <net/checksum.h>
53
54#include "spider_net.h"
55
56MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
57 "<Jens.Osterkamp@de.ibm.com>");
58MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
59MODULE_LICENSE("GPL");
60MODULE_VERSION(VERSION);
61MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME);
62
63static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
64static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
65
66module_param(rx_descriptors, int, 0444);
67module_param(tx_descriptors, int, 0444);
68
69MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
70 "in rx chains");
71MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
72 "in tx chain");
73
74char spider_net_driver_name[] = "spidernet";
75
76static DEFINE_PCI_DEVICE_TABLE(spider_net_pci_tbl) = {
77 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
78 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
79 { 0, }
80};
81
82MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
83
84/**
85 * spider_net_read_reg - reads an SMMIO register of a card
86 * @card: device structure
87 * @reg: register to read from
88 *
89 * returns the content of the specified SMMIO register.
90 */
91static inline u32
92spider_net_read_reg(struct spider_net_card *card, u32 reg)
93{
94 /* We use the powerpc specific variants instead of readl_be() because
95 * we know spidernet is not a real PCI device and we can thus avoid the
96 * performance hit caused by the PCI workarounds.
97 */
98 return in_be32(card->regs + reg);
99}
100
101/**
102 * spider_net_write_reg - writes to an SMMIO register of a card
103 * @card: device structure
104 * @reg: register to write to
105 * @value: value to write into the specified SMMIO register
106 */
107static inline void
108spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
109{
110 /* We use the powerpc specific variants instead of writel_be() because
111 * we know spidernet is not a real PCI device and we can thus avoid the
112 * performance hit caused by the PCI workarounds.
113 */
114 out_be32(card->regs + reg, value);
115}
116
117/**
118 * spider_net_write_phy - write to phy register
119 * @netdev: adapter to be written to
120 * @mii_id: id of MII
121 * @reg: PHY register
122 * @val: value to be written to phy register
123 *
124 * spider_net_write_phy_register writes to an arbitrary PHY
125 * register via the spider GPCWOPCMD register. We assume the queue does
126 * not run full (not more than 15 commands outstanding).
127 **/
128static void
129spider_net_write_phy(struct net_device *netdev, int mii_id,
130 int reg, int val)
131{
132 struct spider_net_card *card = netdev_priv(netdev);
133 u32 writevalue;
134
135 writevalue = ((u32)mii_id << 21) |
136 ((u32)reg << 16) | ((u32)val);
137
138 spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
139}
140
141/**
142 * spider_net_read_phy - read from phy register
143 * @netdev: network device to be read from
144 * @mii_id: id of MII
145 * @reg: PHY register
146 *
147 * Returns value read from PHY register
148 *
149 * spider_net_write_phy reads from an arbitrary PHY
150 * register via the spider GPCROPCMD register
151 **/
152static int
153spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
154{
155 struct spider_net_card *card = netdev_priv(netdev);
156 u32 readvalue;
157
158 readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
159 spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
160
161 /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
162 * interrupt, as we poll for the completion of the read operation
163 * in spider_net_read_phy. Should take about 50 us */
164 do {
165 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
166 } while (readvalue & SPIDER_NET_GPREXEC);
167
168 readvalue &= SPIDER_NET_GPRDAT_MASK;
169
170 return readvalue;
171}
172
173/**
174 * spider_net_setup_aneg - initial auto-negotiation setup
175 * @card: device structure
176 **/
177static void
178spider_net_setup_aneg(struct spider_net_card *card)
179{
180 struct mii_phy *phy = &card->phy;
181 u32 advertise = 0;
182 u16 bmsr, estat;
183
184 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
185 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
186
187 if (bmsr & BMSR_10HALF)
188 advertise |= ADVERTISED_10baseT_Half;
189 if (bmsr & BMSR_10FULL)
190 advertise |= ADVERTISED_10baseT_Full;
191 if (bmsr & BMSR_100HALF)
192 advertise |= ADVERTISED_100baseT_Half;
193 if (bmsr & BMSR_100FULL)
194 advertise |= ADVERTISED_100baseT_Full;
195
196 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
197 advertise |= SUPPORTED_1000baseT_Full;
198 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
199 advertise |= SUPPORTED_1000baseT_Half;
200
201 sungem_phy_probe(phy, phy->mii_id);
202 phy->def->ops->setup_aneg(phy, advertise);
203
204}
205
206/**
207 * spider_net_rx_irq_off - switch off rx irq on this spider card
208 * @card: device structure
209 *
210 * switches off rx irq by masking them out in the GHIINTnMSK register
211 */
212static void
213spider_net_rx_irq_off(struct spider_net_card *card)
214{
215 u32 regvalue;
216
217 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
218 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
219}
220
221/**
222 * spider_net_rx_irq_on - switch on rx irq on this spider card
223 * @card: device structure
224 *
225 * switches on rx irq by enabling them in the GHIINTnMSK register
226 */
227static void
228spider_net_rx_irq_on(struct spider_net_card *card)
229{
230 u32 regvalue;
231
232 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
233 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
234}
235
236/**
237 * spider_net_set_promisc - sets the unicast address or the promiscuous mode
238 * @card: card structure
239 *
240 * spider_net_set_promisc sets the unicast destination address filter and
241 * thus either allows for non-promisc mode or promisc mode
242 */
243static void
244spider_net_set_promisc(struct spider_net_card *card)
245{
246 u32 macu, macl;
247 struct net_device *netdev = card->netdev;
248
249 if (netdev->flags & IFF_PROMISC) {
250 /* clear destination entry 0 */
251 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
252 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
253 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
254 SPIDER_NET_PROMISC_VALUE);
255 } else {
256 macu = netdev->dev_addr[0];
257 macu <<= 8;
258 macu |= netdev->dev_addr[1];
259 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
260
261 macu |= SPIDER_NET_UA_DESCR_VALUE;
262 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
263 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
264 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
265 SPIDER_NET_NONPROMISC_VALUE);
266 }
267}
268
269/**
270 * spider_net_get_mac_address - read mac address from spider card
271 * @card: device structure
272 *
273 * reads MAC address from GMACUNIMACU and GMACUNIMACL registers
274 */
275static int
276spider_net_get_mac_address(struct net_device *netdev)
277{
278 struct spider_net_card *card = netdev_priv(netdev);
279 u32 macl, macu;
280
281 macl = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACL);
282 macu = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACU);
283
284 netdev->dev_addr[0] = (macu >> 24) & 0xff;
285 netdev->dev_addr[1] = (macu >> 16) & 0xff;
286 netdev->dev_addr[2] = (macu >> 8) & 0xff;
287 netdev->dev_addr[3] = macu & 0xff;
288 netdev->dev_addr[4] = (macl >> 8) & 0xff;
289 netdev->dev_addr[5] = macl & 0xff;
290
291 if (!is_valid_ether_addr(&netdev->dev_addr[0]))
292 return -EINVAL;
293
294 return 0;
295}
296
297/**
298 * spider_net_get_descr_status -- returns the status of a descriptor
299 * @descr: descriptor to look at
300 *
301 * returns the status as in the dmac_cmd_status field of the descriptor
302 */
303static inline int
304spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
305{
306 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
307}
308
309/**
310 * spider_net_free_chain - free descriptor chain
311 * @card: card structure
312 * @chain: address of chain
313 *
314 */
315static void
316spider_net_free_chain(struct spider_net_card *card,
317 struct spider_net_descr_chain *chain)
318{
319 struct spider_net_descr *descr;
320
321 descr = chain->ring;
322 do {
323 descr->bus_addr = 0;
324 descr->hwdescr->next_descr_addr = 0;
325 descr = descr->next;
326 } while (descr != chain->ring);
327
328 dma_free_coherent(&card->pdev->dev, chain->num_desc,
329 chain->hwring, chain->dma_addr);
330}
331
332/**
333 * spider_net_init_chain - alloc and link descriptor chain
334 * @card: card structure
335 * @chain: address of chain
336 *
337 * We manage a circular list that mirrors the hardware structure,
338 * except that the hardware uses bus addresses.
339 *
340 * Returns 0 on success, <0 on failure
341 */
342static int
343spider_net_init_chain(struct spider_net_card *card,
344 struct spider_net_descr_chain *chain)
345{
346 int i;
347 struct spider_net_descr *descr;
348 struct spider_net_hw_descr *hwdescr;
349 dma_addr_t buf;
350 size_t alloc_size;
351
352 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
353
354 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
355 &chain->dma_addr, GFP_KERNEL);
356 if (!chain->hwring)
357 return -ENOMEM;
358
359 memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
360
361 /* Set up the hardware pointers in each descriptor */
362 descr = chain->ring;
363 hwdescr = chain->hwring;
364 buf = chain->dma_addr;
365 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
366 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
367 hwdescr->next_descr_addr = 0;
368
369 descr->hwdescr = hwdescr;
370 descr->bus_addr = buf;
371 descr->next = descr + 1;
372 descr->prev = descr - 1;
373
374 buf += sizeof(struct spider_net_hw_descr);
375 }
376 /* do actual circular list */
377 (descr-1)->next = chain->ring;
378 chain->ring->prev = descr-1;
379
380 spin_lock_init(&chain->lock);
381 chain->head = chain->ring;
382 chain->tail = chain->ring;
383 return 0;
384}
385
386/**
387 * spider_net_free_rx_chain_contents - frees descr contents in rx chain
388 * @card: card structure
389 *
390 * returns 0 on success, <0 on failure
391 */
392static void
393spider_net_free_rx_chain_contents(struct spider_net_card *card)
394{
395 struct spider_net_descr *descr;
396
397 descr = card->rx_chain.head;
398 do {
399 if (descr->skb) {
400 pci_unmap_single(card->pdev, descr->hwdescr->buf_addr,
401 SPIDER_NET_MAX_FRAME,
402 PCI_DMA_BIDIRECTIONAL);
403 dev_kfree_skb(descr->skb);
404 descr->skb = NULL;
405 }
406 descr = descr->next;
407 } while (descr != card->rx_chain.head);
408}
409
410/**
411 * spider_net_prepare_rx_descr - Reinitialize RX descriptor
412 * @card: card structure
413 * @descr: descriptor to re-init
414 *
415 * Return 0 on success, <0 on failure.
416 *
417 * Allocates a new rx skb, iommu-maps it and attaches it to the
418 * descriptor. Mark the descriptor as activated, ready-to-use.
419 */
420static int
421spider_net_prepare_rx_descr(struct spider_net_card *card,
422 struct spider_net_descr *descr)
423{
424 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
425 dma_addr_t buf;
426 int offset;
427 int bufsize;
428
429 /* we need to round up the buffer size to a multiple of 128 */
430 bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
431 (~(SPIDER_NET_RXBUF_ALIGN - 1));
432
433 /* and we need to have it 128 byte aligned, therefore we allocate a
434 * bit more */
435 /* allocate an skb */
436 descr->skb = netdev_alloc_skb(card->netdev,
437 bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
438 if (!descr->skb) {
439 if (netif_msg_rx_err(card) && net_ratelimit())
440 dev_err(&card->netdev->dev,
441 "Not enough memory to allocate rx buffer\n");
442 card->spider_stats.alloc_rx_skb_error++;
443 return -ENOMEM;
444 }
445 hwdescr->buf_size = bufsize;
446 hwdescr->result_size = 0;
447 hwdescr->valid_size = 0;
448 hwdescr->data_status = 0;
449 hwdescr->data_error = 0;
450
451 offset = ((unsigned long)descr->skb->data) &
452 (SPIDER_NET_RXBUF_ALIGN - 1);
453 if (offset)
454 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
455 /* iommu-map the skb */
456 buf = pci_map_single(card->pdev, descr->skb->data,
457 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
458 if (pci_dma_mapping_error(card->pdev, buf)) {
459 dev_kfree_skb_any(descr->skb);
460 descr->skb = NULL;
461 if (netif_msg_rx_err(card) && net_ratelimit())
462 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
463 card->spider_stats.rx_iommu_map_error++;
464 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
465 } else {
466 hwdescr->buf_addr = buf;
467 wmb();
468 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
469 SPIDER_NET_DMAC_NOINTR_COMPLETE;
470 }
471
472 return 0;
473}
474
475/**
476 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
477 * @card: card structure
478 *
479 * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
480 * chip by writing to the appropriate register. DMA is enabled in
481 * spider_net_enable_rxdmac.
482 */
483static inline void
484spider_net_enable_rxchtails(struct spider_net_card *card)
485{
486 /* assume chain is aligned correctly */
487 spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
488 card->rx_chain.tail->bus_addr);
489}
490
491/**
492 * spider_net_enable_rxdmac - enables a receive DMA controller
493 * @card: card structure
494 *
495 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
496 * in the GDADMACCNTR register
497 */
498static inline void
499spider_net_enable_rxdmac(struct spider_net_card *card)
500{
501 wmb();
502 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
503 SPIDER_NET_DMA_RX_VALUE);
504}
505
506/**
507 * spider_net_disable_rxdmac - disables the receive DMA controller
508 * @card: card structure
509 *
510 * spider_net_disable_rxdmac terminates processing on the DMA controller
511 * by turing off the DMA controller, with the force-end flag set.
512 */
513static inline void
514spider_net_disable_rxdmac(struct spider_net_card *card)
515{
516 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
517 SPIDER_NET_DMA_RX_FEND_VALUE);
518}
519
520/**
521 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
522 * @card: card structure
523 *
524 * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
525 */
526static void
527spider_net_refill_rx_chain(struct spider_net_card *card)
528{
529 struct spider_net_descr_chain *chain = &card->rx_chain;
530 unsigned long flags;
531
532 /* one context doing the refill (and a second context seeing that
533 * and omitting it) is ok. If called by NAPI, we'll be called again
534 * as spider_net_decode_one_descr is called several times. If some
535 * interrupt calls us, the NAPI is about to clean up anyway. */
536 if (!spin_trylock_irqsave(&chain->lock, flags))
537 return;
538
539 while (spider_net_get_descr_status(chain->head->hwdescr) ==
540 SPIDER_NET_DESCR_NOT_IN_USE) {
541 if (spider_net_prepare_rx_descr(card, chain->head))
542 break;
543 chain->head = chain->head->next;
544 }
545
546 spin_unlock_irqrestore(&chain->lock, flags);
547}
548
549/**
550 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
551 * @card: card structure
552 *
553 * Returns 0 on success, <0 on failure.
554 */
555static int
556spider_net_alloc_rx_skbs(struct spider_net_card *card)
557{
558 struct spider_net_descr_chain *chain = &card->rx_chain;
559 struct spider_net_descr *start = chain->tail;
560 struct spider_net_descr *descr = start;
561
562 /* Link up the hardware chain pointers */
563 do {
564 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
565 descr = descr->next;
566 } while (descr != start);
567
568 /* Put at least one buffer into the chain. if this fails,
569 * we've got a problem. If not, spider_net_refill_rx_chain
570 * will do the rest at the end of this function. */
571 if (spider_net_prepare_rx_descr(card, chain->head))
572 goto error;
573 else
574 chain->head = chain->head->next;
575
576 /* This will allocate the rest of the rx buffers;
577 * if not, it's business as usual later on. */
578 spider_net_refill_rx_chain(card);
579 spider_net_enable_rxdmac(card);
580 return 0;
581
582error:
583 spider_net_free_rx_chain_contents(card);
584 return -ENOMEM;
585}
586
587/**
588 * spider_net_get_multicast_hash - generates hash for multicast filter table
589 * @addr: multicast address
590 *
591 * returns the hash value.
592 *
593 * spider_net_get_multicast_hash calculates a hash value for a given multicast
594 * address, that is used to set the multicast filter tables
595 */
596static u8
597spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
598{
599 u32 crc;
600 u8 hash;
601 char addr_for_crc[ETH_ALEN] = { 0, };
602 int i, bit;
603
604 for (i = 0; i < ETH_ALEN * 8; i++) {
605 bit = (addr[i / 8] >> (i % 8)) & 1;
606 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
607 }
608
609 crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
610
611 hash = (crc >> 27);
612 hash <<= 3;
613 hash |= crc & 7;
614 hash &= 0xff;
615
616 return hash;
617}
618
619/**
620 * spider_net_set_multi - sets multicast addresses and promisc flags
621 * @netdev: interface device structure
622 *
623 * spider_net_set_multi configures multicast addresses as needed for the
624 * netdev interface. It also sets up multicast, allmulti and promisc
625 * flags appropriately
626 */
627static void
628spider_net_set_multi(struct net_device *netdev)
629{
630 struct netdev_hw_addr *ha;
631 u8 hash;
632 int i;
633 u32 reg;
634 struct spider_net_card *card = netdev_priv(netdev);
635 unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] =
636 {0, };
637
638 spider_net_set_promisc(card);
639
640 if (netdev->flags & IFF_ALLMULTI) {
641 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
642 set_bit(i, bitmask);
643 }
644 goto write_hash;
645 }
646
647 /* well, we know, what the broadcast hash value is: it's xfd
648 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
649 set_bit(0xfd, bitmask);
650
651 netdev_for_each_mc_addr(ha, netdev) {
652 hash = spider_net_get_multicast_hash(netdev, ha->addr);
653 set_bit(hash, bitmask);
654 }
655
656write_hash:
657 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
658 reg = 0;
659 if (test_bit(i * 4, bitmask))
660 reg += 0x08;
661 reg <<= 8;
662 if (test_bit(i * 4 + 1, bitmask))
663 reg += 0x08;
664 reg <<= 8;
665 if (test_bit(i * 4 + 2, bitmask))
666 reg += 0x08;
667 reg <<= 8;
668 if (test_bit(i * 4 + 3, bitmask))
669 reg += 0x08;
670
671 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
672 }
673}
674
675/**
676 * spider_net_prepare_tx_descr - fill tx descriptor with skb data
677 * @card: card structure
678 * @skb: packet to use
679 *
680 * returns 0 on success, <0 on failure.
681 *
682 * fills out the descriptor structure with skb data and len. Copies data,
683 * if needed (32bit DMA!)
684 */
685static int
686spider_net_prepare_tx_descr(struct spider_net_card *card,
687 struct sk_buff *skb)
688{
689 struct spider_net_descr_chain *chain = &card->tx_chain;
690 struct spider_net_descr *descr;
691 struct spider_net_hw_descr *hwdescr;
692 dma_addr_t buf;
693 unsigned long flags;
694
695 buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
696 if (pci_dma_mapping_error(card->pdev, buf)) {
697 if (netif_msg_tx_err(card) && net_ratelimit())
698 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
699 "Dropping packet\n", skb->data, skb->len);
700 card->spider_stats.tx_iommu_map_error++;
701 return -ENOMEM;
702 }
703
704 spin_lock_irqsave(&chain->lock, flags);
705 descr = card->tx_chain.head;
706 if (descr->next == chain->tail->prev) {
707 spin_unlock_irqrestore(&chain->lock, flags);
708 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE);
709 return -ENOMEM;
710 }
711 hwdescr = descr->hwdescr;
712 chain->head = descr->next;
713
714 descr->skb = skb;
715 hwdescr->buf_addr = buf;
716 hwdescr->buf_size = skb->len;
717 hwdescr->next_descr_addr = 0;
718 hwdescr->data_status = 0;
719
720 hwdescr->dmac_cmd_status =
721 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
722 spin_unlock_irqrestore(&chain->lock, flags);
723
724 if (skb->ip_summed == CHECKSUM_PARTIAL)
725 switch (ip_hdr(skb)->protocol) {
726 case IPPROTO_TCP:
727 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
728 break;
729 case IPPROTO_UDP:
730 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
731 break;
732 }
733
734 /* Chain the bus address, so that the DMA engine finds this descr. */
735 wmb();
736 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
737
738 card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
739 return 0;
740}
741
742static int
743spider_net_set_low_watermark(struct spider_net_card *card)
744{
745 struct spider_net_descr *descr = card->tx_chain.tail;
746 struct spider_net_hw_descr *hwdescr;
747 unsigned long flags;
748 int status;
749 int cnt=0;
750 int i;
751
752 /* Measure the length of the queue. Measurement does not
753 * need to be precise -- does not need a lock. */
754 while (descr != card->tx_chain.head) {
755 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
756 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
757 break;
758 descr = descr->next;
759 cnt++;
760 }
761
762 /* If TX queue is short, don't even bother with interrupts */
763 if (cnt < card->tx_chain.num_desc/4)
764 return cnt;
765
766 /* Set low-watermark 3/4th's of the way into the queue. */
767 descr = card->tx_chain.tail;
768 cnt = (cnt*3)/4;
769 for (i=0;i<cnt; i++)
770 descr = descr->next;
771
772 /* Set the new watermark, clear the old watermark */
773 spin_lock_irqsave(&card->tx_chain.lock, flags);
774 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
775 if (card->low_watermark && card->low_watermark != descr) {
776 hwdescr = card->low_watermark->hwdescr;
777 hwdescr->dmac_cmd_status =
778 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
779 }
780 card->low_watermark = descr;
781 spin_unlock_irqrestore(&card->tx_chain.lock, flags);
782 return cnt;
783}
784
785/**
786 * spider_net_release_tx_chain - processes sent tx descriptors
787 * @card: adapter structure
788 * @brutal: if set, don't care about whether descriptor seems to be in use
789 *
790 * returns 0 if the tx ring is empty, otherwise 1.
791 *
792 * spider_net_release_tx_chain releases the tx descriptors that spider has
793 * finished with (if non-brutal) or simply release tx descriptors (if brutal).
794 * If some other context is calling this function, we return 1 so that we're
795 * scheduled again (if we were scheduled) and will not lose initiative.
796 */
797static int
798spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
799{
800 struct net_device *dev = card->netdev;
801 struct spider_net_descr_chain *chain = &card->tx_chain;
802 struct spider_net_descr *descr;
803 struct spider_net_hw_descr *hwdescr;
804 struct sk_buff *skb;
805 u32 buf_addr;
806 unsigned long flags;
807 int status;
808
809 while (1) {
810 spin_lock_irqsave(&chain->lock, flags);
811 if (chain->tail == chain->head) {
812 spin_unlock_irqrestore(&chain->lock, flags);
813 return 0;
814 }
815 descr = chain->tail;
816 hwdescr = descr->hwdescr;
817
818 status = spider_net_get_descr_status(hwdescr);
819 switch (status) {
820 case SPIDER_NET_DESCR_COMPLETE:
821 dev->stats.tx_packets++;
822 dev->stats.tx_bytes += descr->skb->len;
823 break;
824
825 case SPIDER_NET_DESCR_CARDOWNED:
826 if (!brutal) {
827 spin_unlock_irqrestore(&chain->lock, flags);
828 return 1;
829 }
830
831 /* fallthrough, if we release the descriptors
832 * brutally (then we don't care about
833 * SPIDER_NET_DESCR_CARDOWNED) */
834
835 case SPIDER_NET_DESCR_RESPONSE_ERROR:
836 case SPIDER_NET_DESCR_PROTECTION_ERROR:
837 case SPIDER_NET_DESCR_FORCE_END:
838 if (netif_msg_tx_err(card))
839 dev_err(&card->netdev->dev, "forcing end of tx descriptor "
840 "with status x%02x\n", status);
841 dev->stats.tx_errors++;
842 break;
843
844 default:
845 dev->stats.tx_dropped++;
846 if (!brutal) {
847 spin_unlock_irqrestore(&chain->lock, flags);
848 return 1;
849 }
850 }
851
852 chain->tail = descr->next;
853 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
854 skb = descr->skb;
855 descr->skb = NULL;
856 buf_addr = hwdescr->buf_addr;
857 spin_unlock_irqrestore(&chain->lock, flags);
858
859 /* unmap the skb */
860 if (skb) {
861 pci_unmap_single(card->pdev, buf_addr, skb->len,
862 PCI_DMA_TODEVICE);
863 dev_consume_skb_any(skb);
864 }
865 }
866 return 0;
867}
868
869/**
870 * spider_net_kick_tx_dma - enables TX DMA processing
871 * @card: card structure
872 *
873 * This routine will start the transmit DMA running if
874 * it is not already running. This routine ned only be
875 * called when queueing a new packet to an empty tx queue.
876 * Writes the current tx chain head as start address
877 * of the tx descriptor chain and enables the transmission
878 * DMA engine.
879 */
880static inline void
881spider_net_kick_tx_dma(struct spider_net_card *card)
882{
883 struct spider_net_descr *descr;
884
885 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
886 SPIDER_NET_TX_DMA_EN)
887 goto out;
888
889 descr = card->tx_chain.tail;
890 for (;;) {
891 if (spider_net_get_descr_status(descr->hwdescr) ==
892 SPIDER_NET_DESCR_CARDOWNED) {
893 spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
894 descr->bus_addr);
895 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
896 SPIDER_NET_DMA_TX_VALUE);
897 break;
898 }
899 if (descr == card->tx_chain.head)
900 break;
901 descr = descr->next;
902 }
903
904out:
905 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
906}
907
908/**
909 * spider_net_xmit - transmits a frame over the device
910 * @skb: packet to send out
911 * @netdev: interface device structure
912 *
913 * returns 0 on success, !0 on failure
914 */
915static int
916spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
917{
918 int cnt;
919 struct spider_net_card *card = netdev_priv(netdev);
920
921 spider_net_release_tx_chain(card, 0);
922
923 if (spider_net_prepare_tx_descr(card, skb) != 0) {
924 netdev->stats.tx_dropped++;
925 netif_stop_queue(netdev);
926 return NETDEV_TX_BUSY;
927 }
928
929 cnt = spider_net_set_low_watermark(card);
930 if (cnt < 5)
931 spider_net_kick_tx_dma(card);
932 return NETDEV_TX_OK;
933}
934
935/**
936 * spider_net_cleanup_tx_ring - cleans up the TX ring
937 * @card: card structure
938 *
939 * spider_net_cleanup_tx_ring is called by either the tx_timer
940 * or from the NAPI polling routine.
941 * This routine releases resources associted with transmitted
942 * packets, including updating the queue tail pointer.
943 */
944static void
945spider_net_cleanup_tx_ring(struct spider_net_card *card)
946{
947 if ((spider_net_release_tx_chain(card, 0) != 0) &&
948 (card->netdev->flags & IFF_UP)) {
949 spider_net_kick_tx_dma(card);
950 netif_wake_queue(card->netdev);
951 }
952}
953
954/**
955 * spider_net_do_ioctl - called for device ioctls
956 * @netdev: interface device structure
957 * @ifr: request parameter structure for ioctl
958 * @cmd: command code for ioctl
959 *
960 * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
961 * -EOPNOTSUPP is returned, if an unknown ioctl was requested
962 */
963static int
964spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
965{
966 switch (cmd) {
967 default:
968 return -EOPNOTSUPP;
969 }
970}
971
972/**
973 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
974 * @descr: descriptor to process
975 * @card: card structure
976 *
977 * Fills out skb structure and passes the data to the stack.
978 * The descriptor state is not changed.
979 */
980static void
981spider_net_pass_skb_up(struct spider_net_descr *descr,
982 struct spider_net_card *card)
983{
984 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
985 struct sk_buff *skb = descr->skb;
986 struct net_device *netdev = card->netdev;
987 u32 data_status = hwdescr->data_status;
988 u32 data_error = hwdescr->data_error;
989
990 skb_put(skb, hwdescr->valid_size);
991
992 /* the card seems to add 2 bytes of junk in front
993 * of the ethernet frame */
994#define SPIDER_MISALIGN 2
995 skb_pull(skb, SPIDER_MISALIGN);
996 skb->protocol = eth_type_trans(skb, netdev);
997
998 /* checksum offload */
999 skb_checksum_none_assert(skb);
1000 if (netdev->features & NETIF_F_RXCSUM) {
1001 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
1002 SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
1003 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
1004 skb->ip_summed = CHECKSUM_UNNECESSARY;
1005 }
1006
1007 if (data_status & SPIDER_NET_VLAN_PACKET) {
1008 /* further enhancements: HW-accel VLAN */
1009 }
1010
1011 /* update netdevice statistics */
1012 netdev->stats.rx_packets++;
1013 netdev->stats.rx_bytes += skb->len;
1014
1015 /* pass skb up to stack */
1016 netif_receive_skb(skb);
1017}
1018
1019static void show_rx_chain(struct spider_net_card *card)
1020{
1021 struct spider_net_descr_chain *chain = &card->rx_chain;
1022 struct spider_net_descr *start= chain->tail;
1023 struct spider_net_descr *descr= start;
1024 struct spider_net_hw_descr *hwd = start->hwdescr;
1025 struct device *dev = &card->netdev->dev;
1026 u32 curr_desc, next_desc;
1027 int status;
1028
1029 int tot = 0;
1030 int cnt = 0;
1031 int off = start - chain->ring;
1032 int cstat = hwd->dmac_cmd_status;
1033
1034 dev_info(dev, "Total number of descrs=%d\n",
1035 chain->num_desc);
1036 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
1037 off, cstat);
1038
1039 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
1040 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
1041
1042 status = cstat;
1043 do
1044 {
1045 hwd = descr->hwdescr;
1046 off = descr - chain->ring;
1047 status = hwd->dmac_cmd_status;
1048
1049 if (descr == chain->head)
1050 dev_info(dev, "Chain head is at %d, head status=0x%x\n",
1051 off, status);
1052
1053 if (curr_desc == descr->bus_addr)
1054 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
1055 off, status);
1056
1057 if (next_desc == descr->bus_addr)
1058 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
1059 off, status);
1060
1061 if (hwd->next_descr_addr == 0)
1062 dev_info(dev, "chain is cut at %d\n", off);
1063
1064 if (cstat != status) {
1065 int from = (chain->num_desc + off - cnt) % chain->num_desc;
1066 int to = (chain->num_desc + off - 1) % chain->num_desc;
1067 dev_info(dev, "Have %d (from %d to %d) descrs "
1068 "with stat=0x%08x\n", cnt, from, to, cstat);
1069 cstat = status;
1070 cnt = 0;
1071 }
1072
1073 cnt ++;
1074 tot ++;
1075 descr = descr->next;
1076 } while (descr != start);
1077
1078 dev_info(dev, "Last %d descrs with stat=0x%08x "
1079 "for a total of %d descrs\n", cnt, cstat, tot);
1080
1081#ifdef DEBUG
1082 /* Now dump the whole ring */
1083 descr = start;
1084 do
1085 {
1086 struct spider_net_hw_descr *hwd = descr->hwdescr;
1087 status = spider_net_get_descr_status(hwd);
1088 cnt = descr - chain->ring;
1089 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
1090 cnt, status, descr->skb);
1091 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
1092 descr->bus_addr, hwd->buf_addr, hwd->buf_size);
1093 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
1094 hwd->next_descr_addr, hwd->result_size,
1095 hwd->valid_size);
1096 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
1097 hwd->dmac_cmd_status, hwd->data_status,
1098 hwd->data_error);
1099 dev_info(dev, "\n");
1100
1101 descr = descr->next;
1102 } while (descr != start);
1103#endif
1104
1105}
1106
1107/**
1108 * spider_net_resync_head_ptr - Advance head ptr past empty descrs
1109 *
1110 * If the driver fails to keep up and empty the queue, then the
1111 * hardware wil run out of room to put incoming packets. This
1112 * will cause the hardware to skip descrs that are full (instead
1113 * of halting/retrying). Thus, once the driver runs, it wil need
1114 * to "catch up" to where the hardware chain pointer is at.
1115 */
1116static void spider_net_resync_head_ptr(struct spider_net_card *card)
1117{
1118 unsigned long flags;
1119 struct spider_net_descr_chain *chain = &card->rx_chain;
1120 struct spider_net_descr *descr;
1121 int i, status;
1122
1123 /* Advance head pointer past any empty descrs */
1124 descr = chain->head;
1125 status = spider_net_get_descr_status(descr->hwdescr);
1126
1127 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
1128 return;
1129
1130 spin_lock_irqsave(&chain->lock, flags);
1131
1132 descr = chain->head;
1133 status = spider_net_get_descr_status(descr->hwdescr);
1134 for (i=0; i<chain->num_desc; i++) {
1135 if (status != SPIDER_NET_DESCR_CARDOWNED) break;
1136 descr = descr->next;
1137 status = spider_net_get_descr_status(descr->hwdescr);
1138 }
1139 chain->head = descr;
1140
1141 spin_unlock_irqrestore(&chain->lock, flags);
1142}
1143
1144static int spider_net_resync_tail_ptr(struct spider_net_card *card)
1145{
1146 struct spider_net_descr_chain *chain = &card->rx_chain;
1147 struct spider_net_descr *descr;
1148 int i, status;
1149
1150 /* Advance tail pointer past any empty and reaped descrs */
1151 descr = chain->tail;
1152 status = spider_net_get_descr_status(descr->hwdescr);
1153
1154 for (i=0; i<chain->num_desc; i++) {
1155 if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
1156 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
1157 descr = descr->next;
1158 status = spider_net_get_descr_status(descr->hwdescr);
1159 }
1160 chain->tail = descr;
1161
1162 if ((i == chain->num_desc) || (i == 0))
1163 return 1;
1164 return 0;
1165}
1166
1167/**
1168 * spider_net_decode_one_descr - processes an RX descriptor
1169 * @card: card structure
1170 *
1171 * Returns 1 if a packet has been sent to the stack, otherwise 0.
1172 *
1173 * Processes an RX descriptor by iommu-unmapping the data buffer
1174 * and passing the packet up to the stack. This function is called
1175 * in softirq context, e.g. either bottom half from interrupt or
1176 * NAPI polling context.
1177 */
1178static int
1179spider_net_decode_one_descr(struct spider_net_card *card)
1180{
1181 struct net_device *dev = card->netdev;
1182 struct spider_net_descr_chain *chain = &card->rx_chain;
1183 struct spider_net_descr *descr = chain->tail;
1184 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
1185 u32 hw_buf_addr;
1186 int status;
1187
1188 status = spider_net_get_descr_status(hwdescr);
1189
1190 /* Nothing in the descriptor, or ring must be empty */
1191 if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
1192 (status == SPIDER_NET_DESCR_NOT_IN_USE))
1193 return 0;
1194
1195 /* descriptor definitively used -- move on tail */
1196 chain->tail = descr->next;
1197
1198 /* unmap descriptor */
1199 hw_buf_addr = hwdescr->buf_addr;
1200 hwdescr->buf_addr = 0xffffffff;
1201 pci_unmap_single(card->pdev, hw_buf_addr,
1202 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
1203
1204 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
1205 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
1206 (status == SPIDER_NET_DESCR_FORCE_END) ) {
1207 if (netif_msg_rx_err(card))
1208 dev_err(&dev->dev,
1209 "dropping RX descriptor with state %d\n", status);
1210 dev->stats.rx_dropped++;
1211 goto bad_desc;
1212 }
1213
1214 if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
1215 (status != SPIDER_NET_DESCR_FRAME_END) ) {
1216 if (netif_msg_rx_err(card))
1217 dev_err(&card->netdev->dev,
1218 "RX descriptor with unknown state %d\n", status);
1219 card->spider_stats.rx_desc_unk_state++;
1220 goto bad_desc;
1221 }
1222
1223 /* The cases we'll throw away the packet immediately */
1224 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
1225 if (netif_msg_rx_err(card))
1226 dev_err(&card->netdev->dev,
1227 "error in received descriptor found, "
1228 "data_status=x%08x, data_error=x%08x\n",
1229 hwdescr->data_status, hwdescr->data_error);
1230 goto bad_desc;
1231 }
1232
1233 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
1234 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
1235 hwdescr->dmac_cmd_status);
1236 pr_err("buf_addr=x%08x\n", hw_buf_addr);
1237 pr_err("buf_size=x%08x\n", hwdescr->buf_size);
1238 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
1239 pr_err("result_size=x%08x\n", hwdescr->result_size);
1240 pr_err("valid_size=x%08x\n", hwdescr->valid_size);
1241 pr_err("data_status=x%08x\n", hwdescr->data_status);
1242 pr_err("data_error=x%08x\n", hwdescr->data_error);
1243 pr_err("which=%ld\n", descr - card->rx_chain.ring);
1244
1245 card->spider_stats.rx_desc_error++;
1246 goto bad_desc;
1247 }
1248
1249 /* Ok, we've got a packet in descr */
1250 spider_net_pass_skb_up(descr, card);
1251 descr->skb = NULL;
1252 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1253 return 1;
1254
1255bad_desc:
1256 if (netif_msg_rx_err(card))
1257 show_rx_chain(card);
1258 dev_kfree_skb_irq(descr->skb);
1259 descr->skb = NULL;
1260 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1261 return 0;
1262}
1263
1264/**
1265 * spider_net_poll - NAPI poll function called by the stack to return packets
1266 * @netdev: interface device structure
1267 * @budget: number of packets we can pass to the stack at most
1268 *
1269 * returns 0 if no more packets available to the driver/stack. Returns 1,
1270 * if the quota is exceeded, but the driver has still packets.
1271 *
1272 * spider_net_poll returns all packets from the rx descriptors to the stack
1273 * (using netif_receive_skb). If all/enough packets are up, the driver
1274 * reenables interrupts and returns 0. If not, 1 is returned.
1275 */
1276static int spider_net_poll(struct napi_struct *napi, int budget)
1277{
1278 struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
1279 int packets_done = 0;
1280
1281 while (packets_done < budget) {
1282 if (!spider_net_decode_one_descr(card))
1283 break;
1284
1285 packets_done++;
1286 }
1287
1288 if ((packets_done == 0) && (card->num_rx_ints != 0)) {
1289 if (!spider_net_resync_tail_ptr(card))
1290 packets_done = budget;
1291 spider_net_resync_head_ptr(card);
1292 }
1293 card->num_rx_ints = 0;
1294
1295 spider_net_refill_rx_chain(card);
1296 spider_net_enable_rxdmac(card);
1297
1298 spider_net_cleanup_tx_ring(card);
1299
1300 /* if all packets are in the stack, enable interrupts and return 0 */
1301 /* if not, return 1 */
1302 if (packets_done < budget) {
1303 napi_complete(napi);
1304 spider_net_rx_irq_on(card);
1305 card->ignore_rx_ramfull = 0;
1306 }
1307
1308 return packets_done;
1309}
1310
1311/**
1312 * spider_net_change_mtu - changes the MTU of an interface
1313 * @netdev: interface device structure
1314 * @new_mtu: new MTU value
1315 *
1316 * returns 0 on success, <0 on failure
1317 */
1318static int
1319spider_net_change_mtu(struct net_device *netdev, int new_mtu)
1320{
1321 /* no need to re-alloc skbs or so -- the max mtu is about 2.3k
1322 * and mtu is outbound only anyway */
1323 if ( (new_mtu < SPIDER_NET_MIN_MTU ) ||
1324 (new_mtu > SPIDER_NET_MAX_MTU) )
1325 return -EINVAL;
1326 netdev->mtu = new_mtu;
1327 return 0;
1328}
1329
1330/**
1331 * spider_net_set_mac - sets the MAC of an interface
1332 * @netdev: interface device structure
1333 * @ptr: pointer to new MAC address
1334 *
1335 * Returns 0 on success, <0 on failure. Currently, we don't support this
1336 * and will always return EOPNOTSUPP.
1337 */
1338static int
1339spider_net_set_mac(struct net_device *netdev, void *p)
1340{
1341 struct spider_net_card *card = netdev_priv(netdev);
1342 u32 macl, macu, regvalue;
1343 struct sockaddr *addr = p;
1344
1345 if (!is_valid_ether_addr(addr->sa_data))
1346 return -EADDRNOTAVAIL;
1347
1348 /* switch off GMACTPE and GMACRPE */
1349 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1350 regvalue &= ~((1 << 5) | (1 << 6));
1351 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1352
1353 /* write mac */
1354 macu = (addr->sa_data[0]<<24) + (addr->sa_data[1]<<16) +
1355 (addr->sa_data[2]<<8) + (addr->sa_data[3]);
1356 macl = (addr->sa_data[4]<<8) + (addr->sa_data[5]);
1357 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
1358 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
1359
1360 /* switch GMACTPE and GMACRPE back on */
1361 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1362 regvalue |= ((1 << 5) | (1 << 6));
1363 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1364
1365 spider_net_set_promisc(card);
1366
1367 /* look up, whether we have been successful */
1368 if (spider_net_get_mac_address(netdev))
1369 return -EADDRNOTAVAIL;
1370 if (memcmp(netdev->dev_addr,addr->sa_data,netdev->addr_len))
1371 return -EADDRNOTAVAIL;
1372
1373 return 0;
1374}
1375
1376/**
1377 * spider_net_link_reset
1378 * @netdev: net device structure
1379 *
1380 * This is called when the PHY_LINK signal is asserted. For the blade this is
1381 * not connected so we should never get here.
1382 *
1383 */
1384static void
1385spider_net_link_reset(struct net_device *netdev)
1386{
1387
1388 struct spider_net_card *card = netdev_priv(netdev);
1389
1390 del_timer_sync(&card->aneg_timer);
1391
1392 /* clear interrupt, block further interrupts */
1393 spider_net_write_reg(card, SPIDER_NET_GMACST,
1394 spider_net_read_reg(card, SPIDER_NET_GMACST));
1395 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1396
1397 /* reset phy and setup aneg */
1398 card->aneg_count = 0;
1399 card->medium = BCM54XX_COPPER;
1400 spider_net_setup_aneg(card);
1401 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1402
1403}
1404
1405/**
1406 * spider_net_handle_error_irq - handles errors raised by an interrupt
1407 * @card: card structure
1408 * @status_reg: interrupt status register 0 (GHIINT0STS)
1409 *
1410 * spider_net_handle_error_irq treats or ignores all error conditions
1411 * found when an interrupt is presented
1412 */
1413static void
1414spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
1415 u32 error_reg1, u32 error_reg2)
1416{
1417 u32 i;
1418 int show_error = 1;
1419
1420 /* check GHIINT0STS ************************************/
1421 if (status_reg)
1422 for (i = 0; i < 32; i++)
1423 if (status_reg & (1<<i))
1424 switch (i)
1425 {
1426 /* let error_reg1 and error_reg2 evaluation decide, what to do
1427 case SPIDER_NET_PHYINT:
1428 case SPIDER_NET_GMAC2INT:
1429 case SPIDER_NET_GMAC1INT:
1430 case SPIDER_NET_GFIFOINT:
1431 case SPIDER_NET_DMACINT:
1432 case SPIDER_NET_GSYSINT:
1433 break; */
1434
1435 case SPIDER_NET_GIPSINT:
1436 show_error = 0;
1437 break;
1438
1439 case SPIDER_NET_GPWOPCMPINT:
1440 /* PHY write operation completed */
1441 show_error = 0;
1442 break;
1443 case SPIDER_NET_GPROPCMPINT:
1444 /* PHY read operation completed */
1445 /* we don't use semaphores, as we poll for the completion
1446 * of the read operation in spider_net_read_phy. Should take
1447 * about 50 us */
1448 show_error = 0;
1449 break;
1450 case SPIDER_NET_GPWFFINT:
1451 /* PHY command queue full */
1452 if (netif_msg_intr(card))
1453 dev_err(&card->netdev->dev, "PHY write queue full\n");
1454 show_error = 0;
1455 break;
1456
1457 /* case SPIDER_NET_GRMDADRINT: not used. print a message */
1458 /* case SPIDER_NET_GRMARPINT: not used. print a message */
1459 /* case SPIDER_NET_GRMMPINT: not used. print a message */
1460
1461 case SPIDER_NET_GDTDEN0INT:
1462 /* someone has set TX_DMA_EN to 0 */
1463 show_error = 0;
1464 break;
1465
1466 case SPIDER_NET_GDDDEN0INT: /* fallthrough */
1467 case SPIDER_NET_GDCDEN0INT: /* fallthrough */
1468 case SPIDER_NET_GDBDEN0INT: /* fallthrough */
1469 case SPIDER_NET_GDADEN0INT:
1470 /* someone has set RX_DMA_EN to 0 */
1471 show_error = 0;
1472 break;
1473
1474 /* RX interrupts */
1475 case SPIDER_NET_GDDFDCINT:
1476 case SPIDER_NET_GDCFDCINT:
1477 case SPIDER_NET_GDBFDCINT:
1478 case SPIDER_NET_GDAFDCINT:
1479 /* case SPIDER_NET_GDNMINT: not used. print a message */
1480 /* case SPIDER_NET_GCNMINT: not used. print a message */
1481 /* case SPIDER_NET_GBNMINT: not used. print a message */
1482 /* case SPIDER_NET_GANMINT: not used. print a message */
1483 /* case SPIDER_NET_GRFNMINT: not used. print a message */
1484 show_error = 0;
1485 break;
1486
1487 /* TX interrupts */
1488 case SPIDER_NET_GDTFDCINT:
1489 show_error = 0;
1490 break;
1491 case SPIDER_NET_GTTEDINT:
1492 show_error = 0;
1493 break;
1494 case SPIDER_NET_GDTDCEINT:
1495 /* chain end. If a descriptor should be sent, kick off
1496 * tx dma
1497 if (card->tx_chain.tail != card->tx_chain.head)
1498 spider_net_kick_tx_dma(card);
1499 */
1500 show_error = 0;
1501 break;
1502
1503 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
1504 /* case SPIDER_NET_GFREECNTINT: not used. print a message */
1505 }
1506
1507 /* check GHIINT1STS ************************************/
1508 if (error_reg1)
1509 for (i = 0; i < 32; i++)
1510 if (error_reg1 & (1<<i))
1511 switch (i)
1512 {
1513 case SPIDER_NET_GTMFLLINT:
1514 /* TX RAM full may happen on a usual case.
1515 * Logging is not needed. */
1516 show_error = 0;
1517 break;
1518 case SPIDER_NET_GRFDFLLINT: /* fallthrough */
1519 case SPIDER_NET_GRFCFLLINT: /* fallthrough */
1520 case SPIDER_NET_GRFBFLLINT: /* fallthrough */
1521 case SPIDER_NET_GRFAFLLINT: /* fallthrough */
1522 case SPIDER_NET_GRMFLLINT:
1523 /* Could happen when rx chain is full */
1524 if (card->ignore_rx_ramfull == 0) {
1525 card->ignore_rx_ramfull = 1;
1526 spider_net_resync_head_ptr(card);
1527 spider_net_refill_rx_chain(card);
1528 spider_net_enable_rxdmac(card);
1529 card->num_rx_ints ++;
1530 napi_schedule(&card->napi);
1531 }
1532 show_error = 0;
1533 break;
1534
1535 /* case SPIDER_NET_GTMSHTINT: problem, print a message */
1536 case SPIDER_NET_GDTINVDINT:
1537 /* allrighty. tx from previous descr ok */
1538 show_error = 0;
1539 break;
1540
1541 /* chain end */
1542 case SPIDER_NET_GDDDCEINT: /* fallthrough */
1543 case SPIDER_NET_GDCDCEINT: /* fallthrough */
1544 case SPIDER_NET_GDBDCEINT: /* fallthrough */
1545 case SPIDER_NET_GDADCEINT:
1546 spider_net_resync_head_ptr(card);
1547 spider_net_refill_rx_chain(card);
1548 spider_net_enable_rxdmac(card);
1549 card->num_rx_ints ++;
1550 napi_schedule(&card->napi);
1551 show_error = 0;
1552 break;
1553
1554 /* invalid descriptor */
1555 case SPIDER_NET_GDDINVDINT: /* fallthrough */
1556 case SPIDER_NET_GDCINVDINT: /* fallthrough */
1557 case SPIDER_NET_GDBINVDINT: /* fallthrough */
1558 case SPIDER_NET_GDAINVDINT:
1559 /* Could happen when rx chain is full */
1560 spider_net_resync_head_ptr(card);
1561 spider_net_refill_rx_chain(card);
1562 spider_net_enable_rxdmac(card);
1563 card->num_rx_ints ++;
1564 napi_schedule(&card->napi);
1565 show_error = 0;
1566 break;
1567
1568 /* case SPIDER_NET_GDTRSERINT: problem, print a message */
1569 /* case SPIDER_NET_GDDRSERINT: problem, print a message */
1570 /* case SPIDER_NET_GDCRSERINT: problem, print a message */
1571 /* case SPIDER_NET_GDBRSERINT: problem, print a message */
1572 /* case SPIDER_NET_GDARSERINT: problem, print a message */
1573 /* case SPIDER_NET_GDSERINT: problem, print a message */
1574 /* case SPIDER_NET_GDTPTERINT: problem, print a message */
1575 /* case SPIDER_NET_GDDPTERINT: problem, print a message */
1576 /* case SPIDER_NET_GDCPTERINT: problem, print a message */
1577 /* case SPIDER_NET_GDBPTERINT: problem, print a message */
1578 /* case SPIDER_NET_GDAPTERINT: problem, print a message */
1579 default:
1580 show_error = 1;
1581 break;
1582 }
1583
1584 /* check GHIINT2STS ************************************/
1585 if (error_reg2)
1586 for (i = 0; i < 32; i++)
1587 if (error_reg2 & (1<<i))
1588 switch (i)
1589 {
1590 /* there is nothing we can (want to) do at this time. Log a
1591 * message, we can switch on and off the specific values later on
1592 case SPIDER_NET_GPROPERINT:
1593 case SPIDER_NET_GMCTCRSNGINT:
1594 case SPIDER_NET_GMCTLCOLINT:
1595 case SPIDER_NET_GMCTTMOTINT:
1596 case SPIDER_NET_GMCRCAERINT:
1597 case SPIDER_NET_GMCRCALERINT:
1598 case SPIDER_NET_GMCRALNERINT:
1599 case SPIDER_NET_GMCROVRINT:
1600 case SPIDER_NET_GMCRRNTINT:
1601 case SPIDER_NET_GMCRRXERINT:
1602 case SPIDER_NET_GTITCSERINT:
1603 case SPIDER_NET_GTIFMTERINT:
1604 case SPIDER_NET_GTIPKTRVKINT:
1605 case SPIDER_NET_GTISPINGINT:
1606 case SPIDER_NET_GTISADNGINT:
1607 case SPIDER_NET_GTISPDNGINT:
1608 case SPIDER_NET_GRIFMTERINT:
1609 case SPIDER_NET_GRIPKTRVKINT:
1610 case SPIDER_NET_GRISPINGINT:
1611 case SPIDER_NET_GRISADNGINT:
1612 case SPIDER_NET_GRISPDNGINT:
1613 break;
1614 */
1615 default:
1616 break;
1617 }
1618
1619 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
1620 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
1621 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1622 status_reg, error_reg1, error_reg2);
1623
1624 /* clear interrupt sources */
1625 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
1626 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
1627}
1628
1629/**
1630 * spider_net_interrupt - interrupt handler for spider_net
1631 * @irq: interrupt number
1632 * @ptr: pointer to net_device
1633 *
1634 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
1635 * interrupt found raised by card.
1636 *
1637 * This is the interrupt handler, that turns off
1638 * interrupts for this device and makes the stack poll the driver
1639 */
1640static irqreturn_t
1641spider_net_interrupt(int irq, void *ptr)
1642{
1643 struct net_device *netdev = ptr;
1644 struct spider_net_card *card = netdev_priv(netdev);
1645 u32 status_reg, error_reg1, error_reg2;
1646
1647 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
1648 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
1649 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
1650
1651 if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
1652 !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
1653 !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
1654 return IRQ_NONE;
1655
1656 if (status_reg & SPIDER_NET_RXINT ) {
1657 spider_net_rx_irq_off(card);
1658 napi_schedule(&card->napi);
1659 card->num_rx_ints ++;
1660 }
1661 if (status_reg & SPIDER_NET_TXINT)
1662 napi_schedule(&card->napi);
1663
1664 if (status_reg & SPIDER_NET_LINKINT)
1665 spider_net_link_reset(netdev);
1666
1667 if (status_reg & SPIDER_NET_ERRINT )
1668 spider_net_handle_error_irq(card, status_reg,
1669 error_reg1, error_reg2);
1670
1671 /* clear interrupt sources */
1672 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
1673
1674 return IRQ_HANDLED;
1675}
1676
1677#ifdef CONFIG_NET_POLL_CONTROLLER
1678/**
1679 * spider_net_poll_controller - artificial interrupt for netconsole etc.
1680 * @netdev: interface device structure
1681 *
1682 * see Documentation/networking/netconsole.txt
1683 */
1684static void
1685spider_net_poll_controller(struct net_device *netdev)
1686{
1687 disable_irq(netdev->irq);
1688 spider_net_interrupt(netdev->irq, netdev);
1689 enable_irq(netdev->irq);
1690}
1691#endif /* CONFIG_NET_POLL_CONTROLLER */
1692
1693/**
1694 * spider_net_enable_interrupts - enable interrupts
1695 * @card: card structure
1696 *
1697 * spider_net_enable_interrupt enables several interrupts
1698 */
1699static void
1700spider_net_enable_interrupts(struct spider_net_card *card)
1701{
1702 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
1703 SPIDER_NET_INT0_MASK_VALUE);
1704 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
1705 SPIDER_NET_INT1_MASK_VALUE);
1706 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
1707 SPIDER_NET_INT2_MASK_VALUE);
1708}
1709
1710/**
1711 * spider_net_disable_interrupts - disable interrupts
1712 * @card: card structure
1713 *
1714 * spider_net_disable_interrupts disables all the interrupts
1715 */
1716static void
1717spider_net_disable_interrupts(struct spider_net_card *card)
1718{
1719 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
1720 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
1721 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
1722 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1723}
1724
1725/**
1726 * spider_net_init_card - initializes the card
1727 * @card: card structure
1728 *
1729 * spider_net_init_card initializes the card so that other registers can
1730 * be used
1731 */
1732static void
1733spider_net_init_card(struct spider_net_card *card)
1734{
1735 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1736 SPIDER_NET_CKRCTRL_STOP_VALUE);
1737
1738 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1739 SPIDER_NET_CKRCTRL_RUN_VALUE);
1740
1741 /* trigger ETOMOD signal */
1742 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1743 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
1744
1745 spider_net_disable_interrupts(card);
1746}
1747
1748/**
1749 * spider_net_enable_card - enables the card by setting all kinds of regs
1750 * @card: card structure
1751 *
1752 * spider_net_enable_card sets a lot of SMMIO registers to enable the device
1753 */
1754static void
1755spider_net_enable_card(struct spider_net_card *card)
1756{
1757 int i;
1758 /* the following array consists of (register),(value) pairs
1759 * that are set in this function. A register of 0 ends the list */
1760 u32 regs[][2] = {
1761 { SPIDER_NET_GRESUMINTNUM, 0 },
1762 { SPIDER_NET_GREINTNUM, 0 },
1763
1764 /* set interrupt frame number registers */
1765 /* clear the single DMA engine registers first */
1766 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1767 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1768 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1769 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1770 /* then set, what we really need */
1771 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
1772
1773 /* timer counter registers and stuff */
1774 { SPIDER_NET_GFREECNNUM, 0 },
1775 { SPIDER_NET_GONETIMENUM, 0 },
1776 { SPIDER_NET_GTOUTFRMNUM, 0 },
1777
1778 /* RX mode setting */
1779 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
1780 /* TX mode setting */
1781 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
1782 /* IPSEC mode setting */
1783 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
1784
1785 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
1786
1787 { SPIDER_NET_GMRWOLCTRL, 0 },
1788 { SPIDER_NET_GTESTMD, 0x10000000 },
1789 { SPIDER_NET_GTTQMSK, 0x00400040 },
1790
1791 { SPIDER_NET_GMACINTEN, 0 },
1792
1793 /* flow control stuff */
1794 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
1795 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
1796
1797 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
1798 { 0, 0}
1799 };
1800
1801 i = 0;
1802 while (regs[i][0]) {
1803 spider_net_write_reg(card, regs[i][0], regs[i][1]);
1804 i++;
1805 }
1806
1807 /* clear unicast filter table entries 1 to 14 */
1808 for (i = 1; i <= 14; i++) {
1809 spider_net_write_reg(card,
1810 SPIDER_NET_GMRUAFILnR + i * 8,
1811 0x00080000);
1812 spider_net_write_reg(card,
1813 SPIDER_NET_GMRUAFILnR + i * 8 + 4,
1814 0x00000000);
1815 }
1816
1817 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
1818
1819 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
1820
1821 /* set chain tail address for RX chains and
1822 * enable DMA */
1823 spider_net_enable_rxchtails(card);
1824 spider_net_enable_rxdmac(card);
1825
1826 spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
1827
1828 spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
1829 SPIDER_NET_LENLMT_VALUE);
1830 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1831 SPIDER_NET_OPMODE_VALUE);
1832
1833 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
1834 SPIDER_NET_GDTBSTA);
1835}
1836
1837/**
1838 * spider_net_download_firmware - loads firmware into the adapter
1839 * @card: card structure
1840 * @firmware_ptr: pointer to firmware data
1841 *
1842 * spider_net_download_firmware loads the firmware data into the
1843 * adapter. It assumes the length etc. to be allright.
1844 */
1845static int
1846spider_net_download_firmware(struct spider_net_card *card,
1847 const void *firmware_ptr)
1848{
1849 int sequencer, i;
1850 const u32 *fw_ptr = firmware_ptr;
1851
1852 /* stop sequencers */
1853 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1854 SPIDER_NET_STOP_SEQ_VALUE);
1855
1856 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
1857 sequencer++) {
1858 spider_net_write_reg(card,
1859 SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
1860 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1861 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
1862 sequencer * 8, *fw_ptr);
1863 fw_ptr++;
1864 }
1865 }
1866
1867 if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
1868 return -EIO;
1869
1870 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1871 SPIDER_NET_RUN_SEQ_VALUE);
1872
1873 return 0;
1874}
1875
1876/**
1877 * spider_net_init_firmware - reads in firmware parts
1878 * @card: card structure
1879 *
1880 * Returns 0 on success, <0 on failure
1881 *
1882 * spider_net_init_firmware opens the sequencer firmware and does some basic
1883 * checks. This function opens and releases the firmware structure. A call
1884 * to download the firmware is performed before the release.
1885 *
1886 * Firmware format
1887 * ===============
1888 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
1889 * the program for each sequencer. Use the command
1890 * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \
1891 * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \
1892 * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
1893 *
1894 * to generate spider_fw.bin, if you have sequencer programs with something
1895 * like the following contents for each sequencer:
1896 * <ONE LINE COMMENT>
1897 * <FIRST 4-BYTES-WORD FOR SEQUENCER>
1898 * <SECOND 4-BYTES-WORD FOR SEQUENCER>
1899 * ...
1900 * <1024th 4-BYTES-WORD FOR SEQUENCER>
1901 */
1902static int
1903spider_net_init_firmware(struct spider_net_card *card)
1904{
1905 struct firmware *firmware = NULL;
1906 struct device_node *dn;
1907 const u8 *fw_prop = NULL;
1908 int err = -ENOENT;
1909 int fw_size;
1910
1911 if (request_firmware((const struct firmware **)&firmware,
1912 SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
1913 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
1914 netif_msg_probe(card) ) {
1915 dev_err(&card->netdev->dev,
1916 "Incorrect size of spidernet firmware in " \
1917 "filesystem. Looking in host firmware...\n");
1918 goto try_host_fw;
1919 }
1920 err = spider_net_download_firmware(card, firmware->data);
1921
1922 release_firmware(firmware);
1923 if (err)
1924 goto try_host_fw;
1925
1926 goto done;
1927 }
1928
1929try_host_fw:
1930 dn = pci_device_to_OF_node(card->pdev);
1931 if (!dn)
1932 goto out_err;
1933
1934 fw_prop = of_get_property(dn, "firmware", &fw_size);
1935 if (!fw_prop)
1936 goto out_err;
1937
1938 if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
1939 netif_msg_probe(card) ) {
1940 dev_err(&card->netdev->dev,
1941 "Incorrect size of spidernet firmware in host firmware\n");
1942 goto done;
1943 }
1944
1945 err = spider_net_download_firmware(card, fw_prop);
1946
1947done:
1948 return err;
1949out_err:
1950 if (netif_msg_probe(card))
1951 dev_err(&card->netdev->dev,
1952 "Couldn't find spidernet firmware in filesystem " \
1953 "or host firmware\n");
1954 return err;
1955}
1956
1957/**
1958 * spider_net_open - called upon ifonfig up
1959 * @netdev: interface device structure
1960 *
1961 * returns 0 on success, <0 on failure
1962 *
1963 * spider_net_open allocates all the descriptors and memory needed for
1964 * operation, sets up multicast list and enables interrupts
1965 */
1966int
1967spider_net_open(struct net_device *netdev)
1968{
1969 struct spider_net_card *card = netdev_priv(netdev);
1970 int result;
1971
1972 result = spider_net_init_firmware(card);
1973 if (result)
1974 goto init_firmware_failed;
1975
1976 /* start probing with copper */
1977 card->aneg_count = 0;
1978 card->medium = BCM54XX_COPPER;
1979 spider_net_setup_aneg(card);
1980 if (card->phy.def->phy_id)
1981 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1982
1983 result = spider_net_init_chain(card, &card->tx_chain);
1984 if (result)
1985 goto alloc_tx_failed;
1986 card->low_watermark = NULL;
1987
1988 result = spider_net_init_chain(card, &card->rx_chain);
1989 if (result)
1990 goto alloc_rx_failed;
1991
1992 /* Allocate rx skbs */
1993 result = spider_net_alloc_rx_skbs(card);
1994 if (result)
1995 goto alloc_skbs_failed;
1996
1997 spider_net_set_multi(netdev);
1998
1999 /* further enhancement: setup hw vlan, if needed */
2000
2001 result = -EBUSY;
2002 if (request_irq(netdev->irq, spider_net_interrupt,
2003 IRQF_SHARED, netdev->name, netdev))
2004 goto register_int_failed;
2005
2006 spider_net_enable_card(card);
2007
2008 netif_start_queue(netdev);
2009 netif_carrier_on(netdev);
2010 napi_enable(&card->napi);
2011
2012 spider_net_enable_interrupts(card);
2013
2014 return 0;
2015
2016register_int_failed:
2017 spider_net_free_rx_chain_contents(card);
2018alloc_skbs_failed:
2019 spider_net_free_chain(card, &card->rx_chain);
2020alloc_rx_failed:
2021 spider_net_free_chain(card, &card->tx_chain);
2022alloc_tx_failed:
2023 del_timer_sync(&card->aneg_timer);
2024init_firmware_failed:
2025 return result;
2026}
2027
2028/**
2029 * spider_net_link_phy
2030 * @data: used for pointer to card structure
2031 *
2032 */
2033static void spider_net_link_phy(unsigned long data)
2034{
2035 struct spider_net_card *card = (struct spider_net_card *)data;
2036 struct mii_phy *phy = &card->phy;
2037
2038 /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
2039 if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
2040
2041 pr_debug("%s: link is down trying to bring it up\n",
2042 card->netdev->name);
2043
2044 switch (card->medium) {
2045 case BCM54XX_COPPER:
2046 /* enable fiber with autonegotiation first */
2047 if (phy->def->ops->enable_fiber)
2048 phy->def->ops->enable_fiber(phy, 1);
2049 card->medium = BCM54XX_FIBER;
2050 break;
2051
2052 case BCM54XX_FIBER:
2053 /* fiber didn't come up, try to disable fiber autoneg */
2054 if (phy->def->ops->enable_fiber)
2055 phy->def->ops->enable_fiber(phy, 0);
2056 card->medium = BCM54XX_UNKNOWN;
2057 break;
2058
2059 case BCM54XX_UNKNOWN:
2060 /* copper, fiber with and without failed,
2061 * retry from beginning */
2062 spider_net_setup_aneg(card);
2063 card->medium = BCM54XX_COPPER;
2064 break;
2065 }
2066
2067 card->aneg_count = 0;
2068 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2069 return;
2070 }
2071
2072 /* link still not up, try again later */
2073 if (!(phy->def->ops->poll_link(phy))) {
2074 card->aneg_count++;
2075 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2076 return;
2077 }
2078
2079 /* link came up, get abilities */
2080 phy->def->ops->read_link(phy);
2081
2082 spider_net_write_reg(card, SPIDER_NET_GMACST,
2083 spider_net_read_reg(card, SPIDER_NET_GMACST));
2084 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
2085
2086 if (phy->speed == 1000)
2087 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
2088 else
2089 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
2090
2091 card->aneg_count = 0;
2092
2093 pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n",
2094 card->netdev->name, phy->speed,
2095 phy->duplex == 1 ? "Full" : "Half",
2096 phy->autoneg == 1 ? "" : "no ");
2097}
2098
2099/**
2100 * spider_net_setup_phy - setup PHY
2101 * @card: card structure
2102 *
2103 * returns 0 on success, <0 on failure
2104 *
2105 * spider_net_setup_phy is used as part of spider_net_probe.
2106 **/
2107static int
2108spider_net_setup_phy(struct spider_net_card *card)
2109{
2110 struct mii_phy *phy = &card->phy;
2111
2112 spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
2113 SPIDER_NET_DMASEL_VALUE);
2114 spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
2115 SPIDER_NET_PHY_CTRL_VALUE);
2116
2117 phy->dev = card->netdev;
2118 phy->mdio_read = spider_net_read_phy;
2119 phy->mdio_write = spider_net_write_phy;
2120
2121 for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
2122 unsigned short id;
2123 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
2124 if (id != 0x0000 && id != 0xffff) {
2125 if (!sungem_phy_probe(phy, phy->mii_id)) {
2126 pr_info("Found %s.\n", phy->def->name);
2127 break;
2128 }
2129 }
2130 }
2131
2132 return 0;
2133}
2134
2135/**
2136 * spider_net_workaround_rxramfull - work around firmware bug
2137 * @card: card structure
2138 *
2139 * no return value
2140 **/
2141static void
2142spider_net_workaround_rxramfull(struct spider_net_card *card)
2143{
2144 int i, sequencer = 0;
2145
2146 /* cancel reset */
2147 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2148 SPIDER_NET_CKRCTRL_RUN_VALUE);
2149
2150 /* empty sequencer data */
2151 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
2152 sequencer++) {
2153 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
2154 sequencer * 8, 0x0);
2155 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
2156 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
2157 sequencer * 8, 0x0);
2158 }
2159 }
2160
2161 /* set sequencer operation */
2162 spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
2163
2164 /* reset */
2165 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2166 SPIDER_NET_CKRCTRL_STOP_VALUE);
2167}
2168
2169/**
2170 * spider_net_stop - called upon ifconfig down
2171 * @netdev: interface device structure
2172 *
2173 * always returns 0
2174 */
2175int
2176spider_net_stop(struct net_device *netdev)
2177{
2178 struct spider_net_card *card = netdev_priv(netdev);
2179
2180 napi_disable(&card->napi);
2181 netif_carrier_off(netdev);
2182 netif_stop_queue(netdev);
2183 del_timer_sync(&card->tx_timer);
2184 del_timer_sync(&card->aneg_timer);
2185
2186 spider_net_disable_interrupts(card);
2187
2188 free_irq(netdev->irq, netdev);
2189
2190 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
2191 SPIDER_NET_DMA_TX_FEND_VALUE);
2192
2193 /* turn off DMA, force end */
2194 spider_net_disable_rxdmac(card);
2195
2196 /* release chains */
2197 spider_net_release_tx_chain(card, 1);
2198 spider_net_free_rx_chain_contents(card);
2199
2200 spider_net_free_chain(card, &card->tx_chain);
2201 spider_net_free_chain(card, &card->rx_chain);
2202
2203 return 0;
2204}
2205
2206/**
2207 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
2208 * function (to be called not under interrupt status)
2209 * @data: data, is interface device structure
2210 *
2211 * called as task when tx hangs, resets interface (if interface is up)
2212 */
2213static void
2214spider_net_tx_timeout_task(struct work_struct *work)
2215{
2216 struct spider_net_card *card =
2217 container_of(work, struct spider_net_card, tx_timeout_task);
2218 struct net_device *netdev = card->netdev;
2219
2220 if (!(netdev->flags & IFF_UP))
2221 goto out;
2222
2223 netif_device_detach(netdev);
2224 spider_net_stop(netdev);
2225
2226 spider_net_workaround_rxramfull(card);
2227 spider_net_init_card(card);
2228
2229 if (spider_net_setup_phy(card))
2230 goto out;
2231
2232 spider_net_open(netdev);
2233 spider_net_kick_tx_dma(card);
2234 netif_device_attach(netdev);
2235
2236out:
2237 atomic_dec(&card->tx_timeout_task_counter);
2238}
2239
2240/**
2241 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
2242 * @netdev: interface device structure
2243 *
2244 * called, if tx hangs. Schedules a task that resets the interface
2245 */
2246static void
2247spider_net_tx_timeout(struct net_device *netdev)
2248{
2249 struct spider_net_card *card;
2250
2251 card = netdev_priv(netdev);
2252 atomic_inc(&card->tx_timeout_task_counter);
2253 if (netdev->flags & IFF_UP)
2254 schedule_work(&card->tx_timeout_task);
2255 else
2256 atomic_dec(&card->tx_timeout_task_counter);
2257 card->spider_stats.tx_timeouts++;
2258}
2259
2260static const struct net_device_ops spider_net_ops = {
2261 .ndo_open = spider_net_open,
2262 .ndo_stop = spider_net_stop,
2263 .ndo_start_xmit = spider_net_xmit,
2264 .ndo_set_rx_mode = spider_net_set_multi,
2265 .ndo_set_mac_address = spider_net_set_mac,
2266 .ndo_change_mtu = spider_net_change_mtu,
2267 .ndo_do_ioctl = spider_net_do_ioctl,
2268 .ndo_tx_timeout = spider_net_tx_timeout,
2269 .ndo_validate_addr = eth_validate_addr,
2270 /* HW VLAN */
2271#ifdef CONFIG_NET_POLL_CONTROLLER
2272 /* poll controller */
2273 .ndo_poll_controller = spider_net_poll_controller,
2274#endif /* CONFIG_NET_POLL_CONTROLLER */
2275};
2276
2277/**
2278 * spider_net_setup_netdev_ops - initialization of net_device operations
2279 * @netdev: net_device structure
2280 *
2281 * fills out function pointers in the net_device structure
2282 */
2283static void
2284spider_net_setup_netdev_ops(struct net_device *netdev)
2285{
2286 netdev->netdev_ops = &spider_net_ops;
2287 netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
2288 /* ethtool ops */
2289 netdev->ethtool_ops = &spider_net_ethtool_ops;
2290}
2291
2292/**
2293 * spider_net_setup_netdev - initialization of net_device
2294 * @card: card structure
2295 *
2296 * Returns 0 on success or <0 on failure
2297 *
2298 * spider_net_setup_netdev initializes the net_device structure
2299 **/
2300static int
2301spider_net_setup_netdev(struct spider_net_card *card)
2302{
2303 int result;
2304 struct net_device *netdev = card->netdev;
2305 struct device_node *dn;
2306 struct sockaddr addr;
2307 const u8 *mac;
2308
2309 SET_NETDEV_DEV(netdev, &card->pdev->dev);
2310
2311 pci_set_drvdata(card->pdev, netdev);
2312
2313 init_timer(&card->tx_timer);
2314 card->tx_timer.function =
2315 (void (*)(unsigned long)) spider_net_cleanup_tx_ring;
2316 card->tx_timer.data = (unsigned long) card;
2317 netdev->irq = card->pdev->irq;
2318
2319 card->aneg_count = 0;
2320 init_timer(&card->aneg_timer);
2321 card->aneg_timer.function = spider_net_link_phy;
2322 card->aneg_timer.data = (unsigned long) card;
2323
2324 netif_napi_add(netdev, &card->napi,
2325 spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
2326
2327 spider_net_setup_netdev_ops(netdev);
2328
2329 netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
2330 if (SPIDER_NET_RX_CSUM_DEFAULT)
2331 netdev->features |= NETIF_F_RXCSUM;
2332 netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
2333 /* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
2334 * NETIF_F_HW_VLAN_CTAG_FILTER */
2335
2336 netdev->irq = card->pdev->irq;
2337 card->num_rx_ints = 0;
2338 card->ignore_rx_ramfull = 0;
2339
2340 dn = pci_device_to_OF_node(card->pdev);
2341 if (!dn)
2342 return -EIO;
2343
2344 mac = of_get_property(dn, "local-mac-address", NULL);
2345 if (!mac)
2346 return -EIO;
2347 memcpy(addr.sa_data, mac, ETH_ALEN);
2348
2349 result = spider_net_set_mac(netdev, &addr);
2350 if ((result) && (netif_msg_probe(card)))
2351 dev_err(&card->netdev->dev,
2352 "Failed to set MAC address: %i\n", result);
2353
2354 result = register_netdev(netdev);
2355 if (result) {
2356 if (netif_msg_probe(card))
2357 dev_err(&card->netdev->dev,
2358 "Couldn't register net_device: %i\n", result);
2359 return result;
2360 }
2361
2362 if (netif_msg_probe(card))
2363 pr_info("Initialized device %s.\n", netdev->name);
2364
2365 return 0;
2366}
2367
2368/**
2369 * spider_net_alloc_card - allocates net_device and card structure
2370 *
2371 * returns the card structure or NULL in case of errors
2372 *
2373 * the card and net_device structures are linked to each other
2374 */
2375static struct spider_net_card *
2376spider_net_alloc_card(void)
2377{
2378 struct net_device *netdev;
2379 struct spider_net_card *card;
2380 size_t alloc_size;
2381
2382 alloc_size = sizeof(struct spider_net_card) +
2383 (tx_descriptors + rx_descriptors) * sizeof(struct spider_net_descr);
2384 netdev = alloc_etherdev(alloc_size);
2385 if (!netdev)
2386 return NULL;
2387
2388 card = netdev_priv(netdev);
2389 card->netdev = netdev;
2390 card->msg_enable = SPIDER_NET_DEFAULT_MSG;
2391 INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
2392 init_waitqueue_head(&card->waitq);
2393 atomic_set(&card->tx_timeout_task_counter, 0);
2394
2395 card->rx_chain.num_desc = rx_descriptors;
2396 card->rx_chain.ring = card->darray;
2397 card->tx_chain.num_desc = tx_descriptors;
2398 card->tx_chain.ring = card->darray + rx_descriptors;
2399
2400 return card;
2401}
2402
2403/**
2404 * spider_net_undo_pci_setup - releases PCI ressources
2405 * @card: card structure
2406 *
2407 * spider_net_undo_pci_setup releases the mapped regions
2408 */
2409static void
2410spider_net_undo_pci_setup(struct spider_net_card *card)
2411{
2412 iounmap(card->regs);
2413 pci_release_regions(card->pdev);
2414}
2415
2416/**
2417 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
2418 * @pdev: PCI device
2419 *
2420 * Returns the card structure or NULL if any errors occur
2421 *
2422 * spider_net_setup_pci_dev initializes pdev and together with the
2423 * functions called in spider_net_open configures the device so that
2424 * data can be transferred over it
2425 * The net_device structure is attached to the card structure, if the
2426 * function returns without error.
2427 **/
2428static struct spider_net_card *
2429spider_net_setup_pci_dev(struct pci_dev *pdev)
2430{
2431 struct spider_net_card *card;
2432 unsigned long mmio_start, mmio_len;
2433
2434 if (pci_enable_device(pdev)) {
2435 dev_err(&pdev->dev, "Couldn't enable PCI device\n");
2436 return NULL;
2437 }
2438
2439 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
2440 dev_err(&pdev->dev,
2441 "Couldn't find proper PCI device base address.\n");
2442 goto out_disable_dev;
2443 }
2444
2445 if (pci_request_regions(pdev, spider_net_driver_name)) {
2446 dev_err(&pdev->dev,
2447 "Couldn't obtain PCI resources, aborting.\n");
2448 goto out_disable_dev;
2449 }
2450
2451 pci_set_master(pdev);
2452
2453 card = spider_net_alloc_card();
2454 if (!card) {
2455 dev_err(&pdev->dev,
2456 "Couldn't allocate net_device structure, aborting.\n");
2457 goto out_release_regions;
2458 }
2459 card->pdev = pdev;
2460
2461 /* fetch base address and length of first resource */
2462 mmio_start = pci_resource_start(pdev, 0);
2463 mmio_len = pci_resource_len(pdev, 0);
2464
2465 card->netdev->mem_start = mmio_start;
2466 card->netdev->mem_end = mmio_start + mmio_len;
2467 card->regs = ioremap(mmio_start, mmio_len);
2468
2469 if (!card->regs) {
2470 dev_err(&pdev->dev,
2471 "Couldn't obtain PCI resources, aborting.\n");
2472 goto out_release_regions;
2473 }
2474
2475 return card;
2476
2477out_release_regions:
2478 pci_release_regions(pdev);
2479out_disable_dev:
2480 pci_disable_device(pdev);
2481 return NULL;
2482}
2483
2484/**
2485 * spider_net_probe - initialization of a device
2486 * @pdev: PCI device
2487 * @ent: entry in the device id list
2488 *
2489 * Returns 0 on success, <0 on failure
2490 *
2491 * spider_net_probe initializes pdev and registers a net_device
2492 * structure for it. After that, the device can be ifconfig'ed up
2493 **/
2494static int
2495spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2496{
2497 int err = -EIO;
2498 struct spider_net_card *card;
2499
2500 card = spider_net_setup_pci_dev(pdev);
2501 if (!card)
2502 goto out;
2503
2504 spider_net_workaround_rxramfull(card);
2505 spider_net_init_card(card);
2506
2507 err = spider_net_setup_phy(card);
2508 if (err)
2509 goto out_undo_pci;
2510
2511 err = spider_net_setup_netdev(card);
2512 if (err)
2513 goto out_undo_pci;
2514
2515 return 0;
2516
2517out_undo_pci:
2518 spider_net_undo_pci_setup(card);
2519 free_netdev(card->netdev);
2520out:
2521 return err;
2522}
2523
2524/**
2525 * spider_net_remove - removal of a device
2526 * @pdev: PCI device
2527 *
2528 * Returns 0 on success, <0 on failure
2529 *
2530 * spider_net_remove is called to remove the device and unregisters the
2531 * net_device
2532 **/
2533static void
2534spider_net_remove(struct pci_dev *pdev)
2535{
2536 struct net_device *netdev;
2537 struct spider_net_card *card;
2538
2539 netdev = pci_get_drvdata(pdev);
2540 card = netdev_priv(netdev);
2541
2542 wait_event(card->waitq,
2543 atomic_read(&card->tx_timeout_task_counter) == 0);
2544
2545 unregister_netdev(netdev);
2546
2547 /* switch off card */
2548 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2549 SPIDER_NET_CKRCTRL_STOP_VALUE);
2550 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2551 SPIDER_NET_CKRCTRL_RUN_VALUE);
2552
2553 spider_net_undo_pci_setup(card);
2554 free_netdev(netdev);
2555}
2556
2557static struct pci_driver spider_net_driver = {
2558 .name = spider_net_driver_name,
2559 .id_table = spider_net_pci_tbl,
2560 .probe = spider_net_probe,
2561 .remove = spider_net_remove
2562};
2563
2564/**
2565 * spider_net_init - init function when the driver is loaded
2566 *
2567 * spider_net_init registers the device driver
2568 */
2569static int __init spider_net_init(void)
2570{
2571 printk(KERN_INFO "Spidernet version %s.\n", VERSION);
2572
2573 if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
2574 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
2575 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2576 }
2577 if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
2578 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
2579 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2580 }
2581 if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
2582 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
2583 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2584 }
2585 if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
2586 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
2587 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2588 }
2589
2590 return pci_register_driver(&spider_net_driver);
2591}
2592
2593/**
2594 * spider_net_cleanup - exit function when driver is unloaded
2595 *
2596 * spider_net_cleanup unregisters the device driver
2597 */
2598static void __exit spider_net_cleanup(void)
2599{
2600 pci_unregister_driver(&spider_net_driver);
2601}
2602
2603module_init(spider_net_init);
2604module_exit(spider_net_cleanup);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Network device driver for Cell Processor-Based Blade and Celleb platform
4 *
5 * (C) Copyright IBM Corp. 2005
6 * (C) Copyright 2006 TOSHIBA CORPORATION
7 *
8 * Authors : Utz Bacher <utz.bacher@de.ibm.com>
9 * Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
10 */
11
12#include <linux/compiler.h>
13#include <linux/crc32.h>
14#include <linux/delay.h>
15#include <linux/etherdevice.h>
16#include <linux/ethtool.h>
17#include <linux/firmware.h>
18#include <linux/if_vlan.h>
19#include <linux/in.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/gfp.h>
23#include <linux/ioport.h>
24#include <linux/ip.h>
25#include <linux/kernel.h>
26#include <linux/mii.h>
27#include <linux/module.h>
28#include <linux/netdevice.h>
29#include <linux/device.h>
30#include <linux/pci.h>
31#include <linux/skbuff.h>
32#include <linux/tcp.h>
33#include <linux/types.h>
34#include <linux/vmalloc.h>
35#include <linux/wait.h>
36#include <linux/workqueue.h>
37#include <linux/bitops.h>
38#include <net/checksum.h>
39
40#include "spider_net.h"
41
42MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
43 "<Jens.Osterkamp@de.ibm.com>");
44MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
45MODULE_LICENSE("GPL");
46MODULE_VERSION(VERSION);
47MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME);
48
49static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
50static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
51
52module_param(rx_descriptors, int, 0444);
53module_param(tx_descriptors, int, 0444);
54
55MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
56 "in rx chains");
57MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
58 "in tx chain");
59
60char spider_net_driver_name[] = "spidernet";
61
62static const struct pci_device_id spider_net_pci_tbl[] = {
63 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
64 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
65 { 0, }
66};
67
68MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
69
70/**
71 * spider_net_read_reg - reads an SMMIO register of a card
72 * @card: device structure
73 * @reg: register to read from
74 *
75 * returns the content of the specified SMMIO register.
76 */
77static inline u32
78spider_net_read_reg(struct spider_net_card *card, u32 reg)
79{
80 /* We use the powerpc specific variants instead of readl_be() because
81 * we know spidernet is not a real PCI device and we can thus avoid the
82 * performance hit caused by the PCI workarounds.
83 */
84 return in_be32(card->regs + reg);
85}
86
87/**
88 * spider_net_write_reg - writes to an SMMIO register of a card
89 * @card: device structure
90 * @reg: register to write to
91 * @value: value to write into the specified SMMIO register
92 */
93static inline void
94spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
95{
96 /* We use the powerpc specific variants instead of writel_be() because
97 * we know spidernet is not a real PCI device and we can thus avoid the
98 * performance hit caused by the PCI workarounds.
99 */
100 out_be32(card->regs + reg, value);
101}
102
103/**
104 * spider_net_write_phy - write to phy register
105 * @netdev: adapter to be written to
106 * @mii_id: id of MII
107 * @reg: PHY register
108 * @val: value to be written to phy register
109 *
110 * spider_net_write_phy_register writes to an arbitrary PHY
111 * register via the spider GPCWOPCMD register. We assume the queue does
112 * not run full (not more than 15 commands outstanding).
113 **/
114static void
115spider_net_write_phy(struct net_device *netdev, int mii_id,
116 int reg, int val)
117{
118 struct spider_net_card *card = netdev_priv(netdev);
119 u32 writevalue;
120
121 writevalue = ((u32)mii_id << 21) |
122 ((u32)reg << 16) | ((u32)val);
123
124 spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
125}
126
127/**
128 * spider_net_read_phy - read from phy register
129 * @netdev: network device to be read from
130 * @mii_id: id of MII
131 * @reg: PHY register
132 *
133 * Returns value read from PHY register
134 *
135 * spider_net_write_phy reads from an arbitrary PHY
136 * register via the spider GPCROPCMD register
137 **/
138static int
139spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
140{
141 struct spider_net_card *card = netdev_priv(netdev);
142 u32 readvalue;
143
144 readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
145 spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
146
147 /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
148 * interrupt, as we poll for the completion of the read operation
149 * in spider_net_read_phy. Should take about 50 us */
150 do {
151 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
152 } while (readvalue & SPIDER_NET_GPREXEC);
153
154 readvalue &= SPIDER_NET_GPRDAT_MASK;
155
156 return readvalue;
157}
158
159/**
160 * spider_net_setup_aneg - initial auto-negotiation setup
161 * @card: device structure
162 **/
163static void
164spider_net_setup_aneg(struct spider_net_card *card)
165{
166 struct mii_phy *phy = &card->phy;
167 u32 advertise = 0;
168 u16 bmsr, estat;
169
170 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
171 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
172
173 if (bmsr & BMSR_10HALF)
174 advertise |= ADVERTISED_10baseT_Half;
175 if (bmsr & BMSR_10FULL)
176 advertise |= ADVERTISED_10baseT_Full;
177 if (bmsr & BMSR_100HALF)
178 advertise |= ADVERTISED_100baseT_Half;
179 if (bmsr & BMSR_100FULL)
180 advertise |= ADVERTISED_100baseT_Full;
181
182 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
183 advertise |= SUPPORTED_1000baseT_Full;
184 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
185 advertise |= SUPPORTED_1000baseT_Half;
186
187 sungem_phy_probe(phy, phy->mii_id);
188 phy->def->ops->setup_aneg(phy, advertise);
189
190}
191
192/**
193 * spider_net_rx_irq_off - switch off rx irq on this spider card
194 * @card: device structure
195 *
196 * switches off rx irq by masking them out in the GHIINTnMSK register
197 */
198static void
199spider_net_rx_irq_off(struct spider_net_card *card)
200{
201 u32 regvalue;
202
203 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
204 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
205}
206
207/**
208 * spider_net_rx_irq_on - switch on rx irq on this spider card
209 * @card: device structure
210 *
211 * switches on rx irq by enabling them in the GHIINTnMSK register
212 */
213static void
214spider_net_rx_irq_on(struct spider_net_card *card)
215{
216 u32 regvalue;
217
218 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
219 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
220}
221
222/**
223 * spider_net_set_promisc - sets the unicast address or the promiscuous mode
224 * @card: card structure
225 *
226 * spider_net_set_promisc sets the unicast destination address filter and
227 * thus either allows for non-promisc mode or promisc mode
228 */
229static void
230spider_net_set_promisc(struct spider_net_card *card)
231{
232 u32 macu, macl;
233 struct net_device *netdev = card->netdev;
234
235 if (netdev->flags & IFF_PROMISC) {
236 /* clear destination entry 0 */
237 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
238 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
239 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
240 SPIDER_NET_PROMISC_VALUE);
241 } else {
242 macu = netdev->dev_addr[0];
243 macu <<= 8;
244 macu |= netdev->dev_addr[1];
245 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
246
247 macu |= SPIDER_NET_UA_DESCR_VALUE;
248 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
249 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
250 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
251 SPIDER_NET_NONPROMISC_VALUE);
252 }
253}
254
255/**
256 * spider_net_get_descr_status -- returns the status of a descriptor
257 * @descr: descriptor to look at
258 *
259 * returns the status as in the dmac_cmd_status field of the descriptor
260 */
261static inline int
262spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
263{
264 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
265}
266
267/**
268 * spider_net_free_chain - free descriptor chain
269 * @card: card structure
270 * @chain: address of chain
271 *
272 */
273static void
274spider_net_free_chain(struct spider_net_card *card,
275 struct spider_net_descr_chain *chain)
276{
277 struct spider_net_descr *descr;
278
279 descr = chain->ring;
280 do {
281 descr->bus_addr = 0;
282 descr->hwdescr->next_descr_addr = 0;
283 descr = descr->next;
284 } while (descr != chain->ring);
285
286 dma_free_coherent(&card->pdev->dev, chain->num_desc,
287 chain->hwring, chain->dma_addr);
288}
289
290/**
291 * spider_net_init_chain - alloc and link descriptor chain
292 * @card: card structure
293 * @chain: address of chain
294 *
295 * We manage a circular list that mirrors the hardware structure,
296 * except that the hardware uses bus addresses.
297 *
298 * Returns 0 on success, <0 on failure
299 */
300static int
301spider_net_init_chain(struct spider_net_card *card,
302 struct spider_net_descr_chain *chain)
303{
304 int i;
305 struct spider_net_descr *descr;
306 struct spider_net_hw_descr *hwdescr;
307 dma_addr_t buf;
308 size_t alloc_size;
309
310 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
311
312 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
313 &chain->dma_addr, GFP_KERNEL);
314 if (!chain->hwring)
315 return -ENOMEM;
316
317 memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
318
319 /* Set up the hardware pointers in each descriptor */
320 descr = chain->ring;
321 hwdescr = chain->hwring;
322 buf = chain->dma_addr;
323 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
324 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
325 hwdescr->next_descr_addr = 0;
326
327 descr->hwdescr = hwdescr;
328 descr->bus_addr = buf;
329 descr->next = descr + 1;
330 descr->prev = descr - 1;
331
332 buf += sizeof(struct spider_net_hw_descr);
333 }
334 /* do actual circular list */
335 (descr-1)->next = chain->ring;
336 chain->ring->prev = descr-1;
337
338 spin_lock_init(&chain->lock);
339 chain->head = chain->ring;
340 chain->tail = chain->ring;
341 return 0;
342}
343
344/**
345 * spider_net_free_rx_chain_contents - frees descr contents in rx chain
346 * @card: card structure
347 *
348 * returns 0 on success, <0 on failure
349 */
350static void
351spider_net_free_rx_chain_contents(struct spider_net_card *card)
352{
353 struct spider_net_descr *descr;
354
355 descr = card->rx_chain.head;
356 do {
357 if (descr->skb) {
358 pci_unmap_single(card->pdev, descr->hwdescr->buf_addr,
359 SPIDER_NET_MAX_FRAME,
360 PCI_DMA_BIDIRECTIONAL);
361 dev_kfree_skb(descr->skb);
362 descr->skb = NULL;
363 }
364 descr = descr->next;
365 } while (descr != card->rx_chain.head);
366}
367
368/**
369 * spider_net_prepare_rx_descr - Reinitialize RX descriptor
370 * @card: card structure
371 * @descr: descriptor to re-init
372 *
373 * Return 0 on success, <0 on failure.
374 *
375 * Allocates a new rx skb, iommu-maps it and attaches it to the
376 * descriptor. Mark the descriptor as activated, ready-to-use.
377 */
378static int
379spider_net_prepare_rx_descr(struct spider_net_card *card,
380 struct spider_net_descr *descr)
381{
382 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
383 dma_addr_t buf;
384 int offset;
385 int bufsize;
386
387 /* we need to round up the buffer size to a multiple of 128 */
388 bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
389 (~(SPIDER_NET_RXBUF_ALIGN - 1));
390
391 /* and we need to have it 128 byte aligned, therefore we allocate a
392 * bit more */
393 /* allocate an skb */
394 descr->skb = netdev_alloc_skb(card->netdev,
395 bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
396 if (!descr->skb) {
397 if (netif_msg_rx_err(card) && net_ratelimit())
398 dev_err(&card->netdev->dev,
399 "Not enough memory to allocate rx buffer\n");
400 card->spider_stats.alloc_rx_skb_error++;
401 return -ENOMEM;
402 }
403 hwdescr->buf_size = bufsize;
404 hwdescr->result_size = 0;
405 hwdescr->valid_size = 0;
406 hwdescr->data_status = 0;
407 hwdescr->data_error = 0;
408
409 offset = ((unsigned long)descr->skb->data) &
410 (SPIDER_NET_RXBUF_ALIGN - 1);
411 if (offset)
412 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
413 /* iommu-map the skb */
414 buf = pci_map_single(card->pdev, descr->skb->data,
415 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
416 if (pci_dma_mapping_error(card->pdev, buf)) {
417 dev_kfree_skb_any(descr->skb);
418 descr->skb = NULL;
419 if (netif_msg_rx_err(card) && net_ratelimit())
420 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
421 card->spider_stats.rx_iommu_map_error++;
422 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
423 } else {
424 hwdescr->buf_addr = buf;
425 wmb();
426 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
427 SPIDER_NET_DMAC_NOINTR_COMPLETE;
428 }
429
430 return 0;
431}
432
433/**
434 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
435 * @card: card structure
436 *
437 * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
438 * chip by writing to the appropriate register. DMA is enabled in
439 * spider_net_enable_rxdmac.
440 */
441static inline void
442spider_net_enable_rxchtails(struct spider_net_card *card)
443{
444 /* assume chain is aligned correctly */
445 spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
446 card->rx_chain.tail->bus_addr);
447}
448
449/**
450 * spider_net_enable_rxdmac - enables a receive DMA controller
451 * @card: card structure
452 *
453 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
454 * in the GDADMACCNTR register
455 */
456static inline void
457spider_net_enable_rxdmac(struct spider_net_card *card)
458{
459 wmb();
460 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
461 SPIDER_NET_DMA_RX_VALUE);
462}
463
464/**
465 * spider_net_disable_rxdmac - disables the receive DMA controller
466 * @card: card structure
467 *
468 * spider_net_disable_rxdmac terminates processing on the DMA controller
469 * by turing off the DMA controller, with the force-end flag set.
470 */
471static inline void
472spider_net_disable_rxdmac(struct spider_net_card *card)
473{
474 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
475 SPIDER_NET_DMA_RX_FEND_VALUE);
476}
477
478/**
479 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
480 * @card: card structure
481 *
482 * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
483 */
484static void
485spider_net_refill_rx_chain(struct spider_net_card *card)
486{
487 struct spider_net_descr_chain *chain = &card->rx_chain;
488 unsigned long flags;
489
490 /* one context doing the refill (and a second context seeing that
491 * and omitting it) is ok. If called by NAPI, we'll be called again
492 * as spider_net_decode_one_descr is called several times. If some
493 * interrupt calls us, the NAPI is about to clean up anyway. */
494 if (!spin_trylock_irqsave(&chain->lock, flags))
495 return;
496
497 while (spider_net_get_descr_status(chain->head->hwdescr) ==
498 SPIDER_NET_DESCR_NOT_IN_USE) {
499 if (spider_net_prepare_rx_descr(card, chain->head))
500 break;
501 chain->head = chain->head->next;
502 }
503
504 spin_unlock_irqrestore(&chain->lock, flags);
505}
506
507/**
508 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
509 * @card: card structure
510 *
511 * Returns 0 on success, <0 on failure.
512 */
513static int
514spider_net_alloc_rx_skbs(struct spider_net_card *card)
515{
516 struct spider_net_descr_chain *chain = &card->rx_chain;
517 struct spider_net_descr *start = chain->tail;
518 struct spider_net_descr *descr = start;
519
520 /* Link up the hardware chain pointers */
521 do {
522 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
523 descr = descr->next;
524 } while (descr != start);
525
526 /* Put at least one buffer into the chain. if this fails,
527 * we've got a problem. If not, spider_net_refill_rx_chain
528 * will do the rest at the end of this function. */
529 if (spider_net_prepare_rx_descr(card, chain->head))
530 goto error;
531 else
532 chain->head = chain->head->next;
533
534 /* This will allocate the rest of the rx buffers;
535 * if not, it's business as usual later on. */
536 spider_net_refill_rx_chain(card);
537 spider_net_enable_rxdmac(card);
538 return 0;
539
540error:
541 spider_net_free_rx_chain_contents(card);
542 return -ENOMEM;
543}
544
545/**
546 * spider_net_get_multicast_hash - generates hash for multicast filter table
547 * @addr: multicast address
548 *
549 * returns the hash value.
550 *
551 * spider_net_get_multicast_hash calculates a hash value for a given multicast
552 * address, that is used to set the multicast filter tables
553 */
554static u8
555spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
556{
557 u32 crc;
558 u8 hash;
559 char addr_for_crc[ETH_ALEN] = { 0, };
560 int i, bit;
561
562 for (i = 0; i < ETH_ALEN * 8; i++) {
563 bit = (addr[i / 8] >> (i % 8)) & 1;
564 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
565 }
566
567 crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
568
569 hash = (crc >> 27);
570 hash <<= 3;
571 hash |= crc & 7;
572 hash &= 0xff;
573
574 return hash;
575}
576
577/**
578 * spider_net_set_multi - sets multicast addresses and promisc flags
579 * @netdev: interface device structure
580 *
581 * spider_net_set_multi configures multicast addresses as needed for the
582 * netdev interface. It also sets up multicast, allmulti and promisc
583 * flags appropriately
584 */
585static void
586spider_net_set_multi(struct net_device *netdev)
587{
588 struct netdev_hw_addr *ha;
589 u8 hash;
590 int i;
591 u32 reg;
592 struct spider_net_card *card = netdev_priv(netdev);
593 DECLARE_BITMAP(bitmask, SPIDER_NET_MULTICAST_HASHES) = {};
594
595 spider_net_set_promisc(card);
596
597 if (netdev->flags & IFF_ALLMULTI) {
598 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
599 set_bit(i, bitmask);
600 }
601 goto write_hash;
602 }
603
604 /* well, we know, what the broadcast hash value is: it's xfd
605 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
606 set_bit(0xfd, bitmask);
607
608 netdev_for_each_mc_addr(ha, netdev) {
609 hash = spider_net_get_multicast_hash(netdev, ha->addr);
610 set_bit(hash, bitmask);
611 }
612
613write_hash:
614 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
615 reg = 0;
616 if (test_bit(i * 4, bitmask))
617 reg += 0x08;
618 reg <<= 8;
619 if (test_bit(i * 4 + 1, bitmask))
620 reg += 0x08;
621 reg <<= 8;
622 if (test_bit(i * 4 + 2, bitmask))
623 reg += 0x08;
624 reg <<= 8;
625 if (test_bit(i * 4 + 3, bitmask))
626 reg += 0x08;
627
628 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
629 }
630}
631
632/**
633 * spider_net_prepare_tx_descr - fill tx descriptor with skb data
634 * @card: card structure
635 * @skb: packet to use
636 *
637 * returns 0 on success, <0 on failure.
638 *
639 * fills out the descriptor structure with skb data and len. Copies data,
640 * if needed (32bit DMA!)
641 */
642static int
643spider_net_prepare_tx_descr(struct spider_net_card *card,
644 struct sk_buff *skb)
645{
646 struct spider_net_descr_chain *chain = &card->tx_chain;
647 struct spider_net_descr *descr;
648 struct spider_net_hw_descr *hwdescr;
649 dma_addr_t buf;
650 unsigned long flags;
651
652 buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
653 if (pci_dma_mapping_error(card->pdev, buf)) {
654 if (netif_msg_tx_err(card) && net_ratelimit())
655 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
656 "Dropping packet\n", skb->data, skb->len);
657 card->spider_stats.tx_iommu_map_error++;
658 return -ENOMEM;
659 }
660
661 spin_lock_irqsave(&chain->lock, flags);
662 descr = card->tx_chain.head;
663 if (descr->next == chain->tail->prev) {
664 spin_unlock_irqrestore(&chain->lock, flags);
665 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE);
666 return -ENOMEM;
667 }
668 hwdescr = descr->hwdescr;
669 chain->head = descr->next;
670
671 descr->skb = skb;
672 hwdescr->buf_addr = buf;
673 hwdescr->buf_size = skb->len;
674 hwdescr->next_descr_addr = 0;
675 hwdescr->data_status = 0;
676
677 hwdescr->dmac_cmd_status =
678 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
679 spin_unlock_irqrestore(&chain->lock, flags);
680
681 if (skb->ip_summed == CHECKSUM_PARTIAL)
682 switch (ip_hdr(skb)->protocol) {
683 case IPPROTO_TCP:
684 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
685 break;
686 case IPPROTO_UDP:
687 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
688 break;
689 }
690
691 /* Chain the bus address, so that the DMA engine finds this descr. */
692 wmb();
693 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
694
695 netif_trans_update(card->netdev); /* set netdev watchdog timer */
696 return 0;
697}
698
699static int
700spider_net_set_low_watermark(struct spider_net_card *card)
701{
702 struct spider_net_descr *descr = card->tx_chain.tail;
703 struct spider_net_hw_descr *hwdescr;
704 unsigned long flags;
705 int status;
706 int cnt=0;
707 int i;
708
709 /* Measure the length of the queue. Measurement does not
710 * need to be precise -- does not need a lock. */
711 while (descr != card->tx_chain.head) {
712 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
713 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
714 break;
715 descr = descr->next;
716 cnt++;
717 }
718
719 /* If TX queue is short, don't even bother with interrupts */
720 if (cnt < card->tx_chain.num_desc/4)
721 return cnt;
722
723 /* Set low-watermark 3/4th's of the way into the queue. */
724 descr = card->tx_chain.tail;
725 cnt = (cnt*3)/4;
726 for (i=0;i<cnt; i++)
727 descr = descr->next;
728
729 /* Set the new watermark, clear the old watermark */
730 spin_lock_irqsave(&card->tx_chain.lock, flags);
731 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
732 if (card->low_watermark && card->low_watermark != descr) {
733 hwdescr = card->low_watermark->hwdescr;
734 hwdescr->dmac_cmd_status =
735 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
736 }
737 card->low_watermark = descr;
738 spin_unlock_irqrestore(&card->tx_chain.lock, flags);
739 return cnt;
740}
741
742/**
743 * spider_net_release_tx_chain - processes sent tx descriptors
744 * @card: adapter structure
745 * @brutal: if set, don't care about whether descriptor seems to be in use
746 *
747 * returns 0 if the tx ring is empty, otherwise 1.
748 *
749 * spider_net_release_tx_chain releases the tx descriptors that spider has
750 * finished with (if non-brutal) or simply release tx descriptors (if brutal).
751 * If some other context is calling this function, we return 1 so that we're
752 * scheduled again (if we were scheduled) and will not lose initiative.
753 */
754static int
755spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
756{
757 struct net_device *dev = card->netdev;
758 struct spider_net_descr_chain *chain = &card->tx_chain;
759 struct spider_net_descr *descr;
760 struct spider_net_hw_descr *hwdescr;
761 struct sk_buff *skb;
762 u32 buf_addr;
763 unsigned long flags;
764 int status;
765
766 while (1) {
767 spin_lock_irqsave(&chain->lock, flags);
768 if (chain->tail == chain->head) {
769 spin_unlock_irqrestore(&chain->lock, flags);
770 return 0;
771 }
772 descr = chain->tail;
773 hwdescr = descr->hwdescr;
774
775 status = spider_net_get_descr_status(hwdescr);
776 switch (status) {
777 case SPIDER_NET_DESCR_COMPLETE:
778 dev->stats.tx_packets++;
779 dev->stats.tx_bytes += descr->skb->len;
780 break;
781
782 case SPIDER_NET_DESCR_CARDOWNED:
783 if (!brutal) {
784 spin_unlock_irqrestore(&chain->lock, flags);
785 return 1;
786 }
787
788 /* fallthrough, if we release the descriptors
789 * brutally (then we don't care about
790 * SPIDER_NET_DESCR_CARDOWNED) */
791 /* Fall through */
792
793 case SPIDER_NET_DESCR_RESPONSE_ERROR:
794 case SPIDER_NET_DESCR_PROTECTION_ERROR:
795 case SPIDER_NET_DESCR_FORCE_END:
796 if (netif_msg_tx_err(card))
797 dev_err(&card->netdev->dev, "forcing end of tx descriptor "
798 "with status x%02x\n", status);
799 dev->stats.tx_errors++;
800 break;
801
802 default:
803 dev->stats.tx_dropped++;
804 if (!brutal) {
805 spin_unlock_irqrestore(&chain->lock, flags);
806 return 1;
807 }
808 }
809
810 chain->tail = descr->next;
811 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
812 skb = descr->skb;
813 descr->skb = NULL;
814 buf_addr = hwdescr->buf_addr;
815 spin_unlock_irqrestore(&chain->lock, flags);
816
817 /* unmap the skb */
818 if (skb) {
819 pci_unmap_single(card->pdev, buf_addr, skb->len,
820 PCI_DMA_TODEVICE);
821 dev_consume_skb_any(skb);
822 }
823 }
824 return 0;
825}
826
827/**
828 * spider_net_kick_tx_dma - enables TX DMA processing
829 * @card: card structure
830 *
831 * This routine will start the transmit DMA running if
832 * it is not already running. This routine ned only be
833 * called when queueing a new packet to an empty tx queue.
834 * Writes the current tx chain head as start address
835 * of the tx descriptor chain and enables the transmission
836 * DMA engine.
837 */
838static inline void
839spider_net_kick_tx_dma(struct spider_net_card *card)
840{
841 struct spider_net_descr *descr;
842
843 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
844 SPIDER_NET_TX_DMA_EN)
845 goto out;
846
847 descr = card->tx_chain.tail;
848 for (;;) {
849 if (spider_net_get_descr_status(descr->hwdescr) ==
850 SPIDER_NET_DESCR_CARDOWNED) {
851 spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
852 descr->bus_addr);
853 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
854 SPIDER_NET_DMA_TX_VALUE);
855 break;
856 }
857 if (descr == card->tx_chain.head)
858 break;
859 descr = descr->next;
860 }
861
862out:
863 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
864}
865
866/**
867 * spider_net_xmit - transmits a frame over the device
868 * @skb: packet to send out
869 * @netdev: interface device structure
870 *
871 * returns NETDEV_TX_OK on success, NETDEV_TX_BUSY on failure
872 */
873static netdev_tx_t
874spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
875{
876 int cnt;
877 struct spider_net_card *card = netdev_priv(netdev);
878
879 spider_net_release_tx_chain(card, 0);
880
881 if (spider_net_prepare_tx_descr(card, skb) != 0) {
882 netdev->stats.tx_dropped++;
883 netif_stop_queue(netdev);
884 return NETDEV_TX_BUSY;
885 }
886
887 cnt = spider_net_set_low_watermark(card);
888 if (cnt < 5)
889 spider_net_kick_tx_dma(card);
890 return NETDEV_TX_OK;
891}
892
893/**
894 * spider_net_cleanup_tx_ring - cleans up the TX ring
895 * @card: card structure
896 *
897 * spider_net_cleanup_tx_ring is called by either the tx_timer
898 * or from the NAPI polling routine.
899 * This routine releases resources associted with transmitted
900 * packets, including updating the queue tail pointer.
901 */
902static void
903spider_net_cleanup_tx_ring(struct timer_list *t)
904{
905 struct spider_net_card *card = from_timer(card, t, tx_timer);
906 if ((spider_net_release_tx_chain(card, 0) != 0) &&
907 (card->netdev->flags & IFF_UP)) {
908 spider_net_kick_tx_dma(card);
909 netif_wake_queue(card->netdev);
910 }
911}
912
913/**
914 * spider_net_do_ioctl - called for device ioctls
915 * @netdev: interface device structure
916 * @ifr: request parameter structure for ioctl
917 * @cmd: command code for ioctl
918 *
919 * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
920 * -EOPNOTSUPP is returned, if an unknown ioctl was requested
921 */
922static int
923spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
924{
925 switch (cmd) {
926 default:
927 return -EOPNOTSUPP;
928 }
929}
930
931/**
932 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
933 * @descr: descriptor to process
934 * @card: card structure
935 *
936 * Fills out skb structure and passes the data to the stack.
937 * The descriptor state is not changed.
938 */
939static void
940spider_net_pass_skb_up(struct spider_net_descr *descr,
941 struct spider_net_card *card)
942{
943 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
944 struct sk_buff *skb = descr->skb;
945 struct net_device *netdev = card->netdev;
946 u32 data_status = hwdescr->data_status;
947 u32 data_error = hwdescr->data_error;
948
949 skb_put(skb, hwdescr->valid_size);
950
951 /* the card seems to add 2 bytes of junk in front
952 * of the ethernet frame */
953#define SPIDER_MISALIGN 2
954 skb_pull(skb, SPIDER_MISALIGN);
955 skb->protocol = eth_type_trans(skb, netdev);
956
957 /* checksum offload */
958 skb_checksum_none_assert(skb);
959 if (netdev->features & NETIF_F_RXCSUM) {
960 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
961 SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
962 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
963 skb->ip_summed = CHECKSUM_UNNECESSARY;
964 }
965
966 if (data_status & SPIDER_NET_VLAN_PACKET) {
967 /* further enhancements: HW-accel VLAN */
968 }
969
970 /* update netdevice statistics */
971 netdev->stats.rx_packets++;
972 netdev->stats.rx_bytes += skb->len;
973
974 /* pass skb up to stack */
975 netif_receive_skb(skb);
976}
977
978static void show_rx_chain(struct spider_net_card *card)
979{
980 struct spider_net_descr_chain *chain = &card->rx_chain;
981 struct spider_net_descr *start= chain->tail;
982 struct spider_net_descr *descr= start;
983 struct spider_net_hw_descr *hwd = start->hwdescr;
984 struct device *dev = &card->netdev->dev;
985 u32 curr_desc, next_desc;
986 int status;
987
988 int tot = 0;
989 int cnt = 0;
990 int off = start - chain->ring;
991 int cstat = hwd->dmac_cmd_status;
992
993 dev_info(dev, "Total number of descrs=%d\n",
994 chain->num_desc);
995 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
996 off, cstat);
997
998 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
999 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
1000
1001 status = cstat;
1002 do
1003 {
1004 hwd = descr->hwdescr;
1005 off = descr - chain->ring;
1006 status = hwd->dmac_cmd_status;
1007
1008 if (descr == chain->head)
1009 dev_info(dev, "Chain head is at %d, head status=0x%x\n",
1010 off, status);
1011
1012 if (curr_desc == descr->bus_addr)
1013 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
1014 off, status);
1015
1016 if (next_desc == descr->bus_addr)
1017 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
1018 off, status);
1019
1020 if (hwd->next_descr_addr == 0)
1021 dev_info(dev, "chain is cut at %d\n", off);
1022
1023 if (cstat != status) {
1024 int from = (chain->num_desc + off - cnt) % chain->num_desc;
1025 int to = (chain->num_desc + off - 1) % chain->num_desc;
1026 dev_info(dev, "Have %d (from %d to %d) descrs "
1027 "with stat=0x%08x\n", cnt, from, to, cstat);
1028 cstat = status;
1029 cnt = 0;
1030 }
1031
1032 cnt ++;
1033 tot ++;
1034 descr = descr->next;
1035 } while (descr != start);
1036
1037 dev_info(dev, "Last %d descrs with stat=0x%08x "
1038 "for a total of %d descrs\n", cnt, cstat, tot);
1039
1040#ifdef DEBUG
1041 /* Now dump the whole ring */
1042 descr = start;
1043 do
1044 {
1045 struct spider_net_hw_descr *hwd = descr->hwdescr;
1046 status = spider_net_get_descr_status(hwd);
1047 cnt = descr - chain->ring;
1048 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
1049 cnt, status, descr->skb);
1050 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
1051 descr->bus_addr, hwd->buf_addr, hwd->buf_size);
1052 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
1053 hwd->next_descr_addr, hwd->result_size,
1054 hwd->valid_size);
1055 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
1056 hwd->dmac_cmd_status, hwd->data_status,
1057 hwd->data_error);
1058 dev_info(dev, "\n");
1059
1060 descr = descr->next;
1061 } while (descr != start);
1062#endif
1063
1064}
1065
1066/**
1067 * spider_net_resync_head_ptr - Advance head ptr past empty descrs
1068 *
1069 * If the driver fails to keep up and empty the queue, then the
1070 * hardware wil run out of room to put incoming packets. This
1071 * will cause the hardware to skip descrs that are full (instead
1072 * of halting/retrying). Thus, once the driver runs, it wil need
1073 * to "catch up" to where the hardware chain pointer is at.
1074 */
1075static void spider_net_resync_head_ptr(struct spider_net_card *card)
1076{
1077 unsigned long flags;
1078 struct spider_net_descr_chain *chain = &card->rx_chain;
1079 struct spider_net_descr *descr;
1080 int i, status;
1081
1082 /* Advance head pointer past any empty descrs */
1083 descr = chain->head;
1084 status = spider_net_get_descr_status(descr->hwdescr);
1085
1086 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
1087 return;
1088
1089 spin_lock_irqsave(&chain->lock, flags);
1090
1091 descr = chain->head;
1092 status = spider_net_get_descr_status(descr->hwdescr);
1093 for (i=0; i<chain->num_desc; i++) {
1094 if (status != SPIDER_NET_DESCR_CARDOWNED) break;
1095 descr = descr->next;
1096 status = spider_net_get_descr_status(descr->hwdescr);
1097 }
1098 chain->head = descr;
1099
1100 spin_unlock_irqrestore(&chain->lock, flags);
1101}
1102
1103static int spider_net_resync_tail_ptr(struct spider_net_card *card)
1104{
1105 struct spider_net_descr_chain *chain = &card->rx_chain;
1106 struct spider_net_descr *descr;
1107 int i, status;
1108
1109 /* Advance tail pointer past any empty and reaped descrs */
1110 descr = chain->tail;
1111 status = spider_net_get_descr_status(descr->hwdescr);
1112
1113 for (i=0; i<chain->num_desc; i++) {
1114 if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
1115 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
1116 descr = descr->next;
1117 status = spider_net_get_descr_status(descr->hwdescr);
1118 }
1119 chain->tail = descr;
1120
1121 if ((i == chain->num_desc) || (i == 0))
1122 return 1;
1123 return 0;
1124}
1125
1126/**
1127 * spider_net_decode_one_descr - processes an RX descriptor
1128 * @card: card structure
1129 *
1130 * Returns 1 if a packet has been sent to the stack, otherwise 0.
1131 *
1132 * Processes an RX descriptor by iommu-unmapping the data buffer
1133 * and passing the packet up to the stack. This function is called
1134 * in softirq context, e.g. either bottom half from interrupt or
1135 * NAPI polling context.
1136 */
1137static int
1138spider_net_decode_one_descr(struct spider_net_card *card)
1139{
1140 struct net_device *dev = card->netdev;
1141 struct spider_net_descr_chain *chain = &card->rx_chain;
1142 struct spider_net_descr *descr = chain->tail;
1143 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
1144 u32 hw_buf_addr;
1145 int status;
1146
1147 status = spider_net_get_descr_status(hwdescr);
1148
1149 /* Nothing in the descriptor, or ring must be empty */
1150 if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
1151 (status == SPIDER_NET_DESCR_NOT_IN_USE))
1152 return 0;
1153
1154 /* descriptor definitively used -- move on tail */
1155 chain->tail = descr->next;
1156
1157 /* unmap descriptor */
1158 hw_buf_addr = hwdescr->buf_addr;
1159 hwdescr->buf_addr = 0xffffffff;
1160 pci_unmap_single(card->pdev, hw_buf_addr,
1161 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
1162
1163 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
1164 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
1165 (status == SPIDER_NET_DESCR_FORCE_END) ) {
1166 if (netif_msg_rx_err(card))
1167 dev_err(&dev->dev,
1168 "dropping RX descriptor with state %d\n", status);
1169 dev->stats.rx_dropped++;
1170 goto bad_desc;
1171 }
1172
1173 if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
1174 (status != SPIDER_NET_DESCR_FRAME_END) ) {
1175 if (netif_msg_rx_err(card))
1176 dev_err(&card->netdev->dev,
1177 "RX descriptor with unknown state %d\n", status);
1178 card->spider_stats.rx_desc_unk_state++;
1179 goto bad_desc;
1180 }
1181
1182 /* The cases we'll throw away the packet immediately */
1183 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
1184 if (netif_msg_rx_err(card))
1185 dev_err(&card->netdev->dev,
1186 "error in received descriptor found, "
1187 "data_status=x%08x, data_error=x%08x\n",
1188 hwdescr->data_status, hwdescr->data_error);
1189 goto bad_desc;
1190 }
1191
1192 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
1193 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
1194 hwdescr->dmac_cmd_status);
1195 pr_err("buf_addr=x%08x\n", hw_buf_addr);
1196 pr_err("buf_size=x%08x\n", hwdescr->buf_size);
1197 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
1198 pr_err("result_size=x%08x\n", hwdescr->result_size);
1199 pr_err("valid_size=x%08x\n", hwdescr->valid_size);
1200 pr_err("data_status=x%08x\n", hwdescr->data_status);
1201 pr_err("data_error=x%08x\n", hwdescr->data_error);
1202 pr_err("which=%ld\n", descr - card->rx_chain.ring);
1203
1204 card->spider_stats.rx_desc_error++;
1205 goto bad_desc;
1206 }
1207
1208 /* Ok, we've got a packet in descr */
1209 spider_net_pass_skb_up(descr, card);
1210 descr->skb = NULL;
1211 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1212 return 1;
1213
1214bad_desc:
1215 if (netif_msg_rx_err(card))
1216 show_rx_chain(card);
1217 dev_kfree_skb_irq(descr->skb);
1218 descr->skb = NULL;
1219 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
1220 return 0;
1221}
1222
1223/**
1224 * spider_net_poll - NAPI poll function called by the stack to return packets
1225 * @netdev: interface device structure
1226 * @budget: number of packets we can pass to the stack at most
1227 *
1228 * returns 0 if no more packets available to the driver/stack. Returns 1,
1229 * if the quota is exceeded, but the driver has still packets.
1230 *
1231 * spider_net_poll returns all packets from the rx descriptors to the stack
1232 * (using netif_receive_skb). If all/enough packets are up, the driver
1233 * reenables interrupts and returns 0. If not, 1 is returned.
1234 */
1235static int spider_net_poll(struct napi_struct *napi, int budget)
1236{
1237 struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
1238 int packets_done = 0;
1239
1240 while (packets_done < budget) {
1241 if (!spider_net_decode_one_descr(card))
1242 break;
1243
1244 packets_done++;
1245 }
1246
1247 if ((packets_done == 0) && (card->num_rx_ints != 0)) {
1248 if (!spider_net_resync_tail_ptr(card))
1249 packets_done = budget;
1250 spider_net_resync_head_ptr(card);
1251 }
1252 card->num_rx_ints = 0;
1253
1254 spider_net_refill_rx_chain(card);
1255 spider_net_enable_rxdmac(card);
1256
1257 spider_net_cleanup_tx_ring(&card->tx_timer);
1258
1259 /* if all packets are in the stack, enable interrupts and return 0 */
1260 /* if not, return 1 */
1261 if (packets_done < budget) {
1262 napi_complete_done(napi, packets_done);
1263 spider_net_rx_irq_on(card);
1264 card->ignore_rx_ramfull = 0;
1265 }
1266
1267 return packets_done;
1268}
1269
1270/**
1271 * spider_net_set_mac - sets the MAC of an interface
1272 * @netdev: interface device structure
1273 * @ptr: pointer to new MAC address
1274 *
1275 * Returns 0 on success, <0 on failure. Currently, we don't support this
1276 * and will always return EOPNOTSUPP.
1277 */
1278static int
1279spider_net_set_mac(struct net_device *netdev, void *p)
1280{
1281 struct spider_net_card *card = netdev_priv(netdev);
1282 u32 macl, macu, regvalue;
1283 struct sockaddr *addr = p;
1284
1285 if (!is_valid_ether_addr(addr->sa_data))
1286 return -EADDRNOTAVAIL;
1287
1288 memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
1289
1290 /* switch off GMACTPE and GMACRPE */
1291 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1292 regvalue &= ~((1 << 5) | (1 << 6));
1293 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1294
1295 /* write mac */
1296 macu = (netdev->dev_addr[0]<<24) + (netdev->dev_addr[1]<<16) +
1297 (netdev->dev_addr[2]<<8) + (netdev->dev_addr[3]);
1298 macl = (netdev->dev_addr[4]<<8) + (netdev->dev_addr[5]);
1299 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
1300 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
1301
1302 /* switch GMACTPE and GMACRPE back on */
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 spider_net_set_promisc(card);
1308
1309 return 0;
1310}
1311
1312/**
1313 * spider_net_link_reset
1314 * @netdev: net device structure
1315 *
1316 * This is called when the PHY_LINK signal is asserted. For the blade this is
1317 * not connected so we should never get here.
1318 *
1319 */
1320static void
1321spider_net_link_reset(struct net_device *netdev)
1322{
1323
1324 struct spider_net_card *card = netdev_priv(netdev);
1325
1326 del_timer_sync(&card->aneg_timer);
1327
1328 /* clear interrupt, block further interrupts */
1329 spider_net_write_reg(card, SPIDER_NET_GMACST,
1330 spider_net_read_reg(card, SPIDER_NET_GMACST));
1331 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1332
1333 /* reset phy and setup aneg */
1334 card->aneg_count = 0;
1335 card->medium = BCM54XX_COPPER;
1336 spider_net_setup_aneg(card);
1337 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1338
1339}
1340
1341/**
1342 * spider_net_handle_error_irq - handles errors raised by an interrupt
1343 * @card: card structure
1344 * @status_reg: interrupt status register 0 (GHIINT0STS)
1345 *
1346 * spider_net_handle_error_irq treats or ignores all error conditions
1347 * found when an interrupt is presented
1348 */
1349static void
1350spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
1351 u32 error_reg1, u32 error_reg2)
1352{
1353 u32 i;
1354 int show_error = 1;
1355
1356 /* check GHIINT0STS ************************************/
1357 if (status_reg)
1358 for (i = 0; i < 32; i++)
1359 if (status_reg & (1<<i))
1360 switch (i)
1361 {
1362 /* let error_reg1 and error_reg2 evaluation decide, what to do
1363 case SPIDER_NET_PHYINT:
1364 case SPIDER_NET_GMAC2INT:
1365 case SPIDER_NET_GMAC1INT:
1366 case SPIDER_NET_GFIFOINT:
1367 case SPIDER_NET_DMACINT:
1368 case SPIDER_NET_GSYSINT:
1369 break; */
1370
1371 case SPIDER_NET_GIPSINT:
1372 show_error = 0;
1373 break;
1374
1375 case SPIDER_NET_GPWOPCMPINT:
1376 /* PHY write operation completed */
1377 show_error = 0;
1378 break;
1379 case SPIDER_NET_GPROPCMPINT:
1380 /* PHY read operation completed */
1381 /* we don't use semaphores, as we poll for the completion
1382 * of the read operation in spider_net_read_phy. Should take
1383 * about 50 us */
1384 show_error = 0;
1385 break;
1386 case SPIDER_NET_GPWFFINT:
1387 /* PHY command queue full */
1388 if (netif_msg_intr(card))
1389 dev_err(&card->netdev->dev, "PHY write queue full\n");
1390 show_error = 0;
1391 break;
1392
1393 /* case SPIDER_NET_GRMDADRINT: not used. print a message */
1394 /* case SPIDER_NET_GRMARPINT: not used. print a message */
1395 /* case SPIDER_NET_GRMMPINT: not used. print a message */
1396
1397 case SPIDER_NET_GDTDEN0INT:
1398 /* someone has set TX_DMA_EN to 0 */
1399 show_error = 0;
1400 break;
1401
1402 case SPIDER_NET_GDDDEN0INT: /* fallthrough */
1403 case SPIDER_NET_GDCDEN0INT: /* fallthrough */
1404 case SPIDER_NET_GDBDEN0INT: /* fallthrough */
1405 case SPIDER_NET_GDADEN0INT:
1406 /* someone has set RX_DMA_EN to 0 */
1407 show_error = 0;
1408 break;
1409
1410 /* RX interrupts */
1411 case SPIDER_NET_GDDFDCINT:
1412 case SPIDER_NET_GDCFDCINT:
1413 case SPIDER_NET_GDBFDCINT:
1414 case SPIDER_NET_GDAFDCINT:
1415 /* case SPIDER_NET_GDNMINT: not used. print a message */
1416 /* case SPIDER_NET_GCNMINT: not used. print a message */
1417 /* case SPIDER_NET_GBNMINT: not used. print a message */
1418 /* case SPIDER_NET_GANMINT: not used. print a message */
1419 /* case SPIDER_NET_GRFNMINT: not used. print a message */
1420 show_error = 0;
1421 break;
1422
1423 /* TX interrupts */
1424 case SPIDER_NET_GDTFDCINT:
1425 show_error = 0;
1426 break;
1427 case SPIDER_NET_GTTEDINT:
1428 show_error = 0;
1429 break;
1430 case SPIDER_NET_GDTDCEINT:
1431 /* chain end. If a descriptor should be sent, kick off
1432 * tx dma
1433 if (card->tx_chain.tail != card->tx_chain.head)
1434 spider_net_kick_tx_dma(card);
1435 */
1436 show_error = 0;
1437 break;
1438
1439 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
1440 /* case SPIDER_NET_GFREECNTINT: not used. print a message */
1441 }
1442
1443 /* check GHIINT1STS ************************************/
1444 if (error_reg1)
1445 for (i = 0; i < 32; i++)
1446 if (error_reg1 & (1<<i))
1447 switch (i)
1448 {
1449 case SPIDER_NET_GTMFLLINT:
1450 /* TX RAM full may happen on a usual case.
1451 * Logging is not needed. */
1452 show_error = 0;
1453 break;
1454 case SPIDER_NET_GRFDFLLINT: /* fallthrough */
1455 case SPIDER_NET_GRFCFLLINT: /* fallthrough */
1456 case SPIDER_NET_GRFBFLLINT: /* fallthrough */
1457 case SPIDER_NET_GRFAFLLINT: /* fallthrough */
1458 case SPIDER_NET_GRMFLLINT:
1459 /* Could happen when rx chain is full */
1460 if (card->ignore_rx_ramfull == 0) {
1461 card->ignore_rx_ramfull = 1;
1462 spider_net_resync_head_ptr(card);
1463 spider_net_refill_rx_chain(card);
1464 spider_net_enable_rxdmac(card);
1465 card->num_rx_ints ++;
1466 napi_schedule(&card->napi);
1467 }
1468 show_error = 0;
1469 break;
1470
1471 /* case SPIDER_NET_GTMSHTINT: problem, print a message */
1472 case SPIDER_NET_GDTINVDINT:
1473 /* allrighty. tx from previous descr ok */
1474 show_error = 0;
1475 break;
1476
1477 /* chain end */
1478 case SPIDER_NET_GDDDCEINT: /* fallthrough */
1479 case SPIDER_NET_GDCDCEINT: /* fallthrough */
1480 case SPIDER_NET_GDBDCEINT: /* fallthrough */
1481 case SPIDER_NET_GDADCEINT:
1482 spider_net_resync_head_ptr(card);
1483 spider_net_refill_rx_chain(card);
1484 spider_net_enable_rxdmac(card);
1485 card->num_rx_ints ++;
1486 napi_schedule(&card->napi);
1487 show_error = 0;
1488 break;
1489
1490 /* invalid descriptor */
1491 case SPIDER_NET_GDDINVDINT: /* fallthrough */
1492 case SPIDER_NET_GDCINVDINT: /* fallthrough */
1493 case SPIDER_NET_GDBINVDINT: /* fallthrough */
1494 case SPIDER_NET_GDAINVDINT:
1495 /* Could happen when rx chain is full */
1496 spider_net_resync_head_ptr(card);
1497 spider_net_refill_rx_chain(card);
1498 spider_net_enable_rxdmac(card);
1499 card->num_rx_ints ++;
1500 napi_schedule(&card->napi);
1501 show_error = 0;
1502 break;
1503
1504 /* case SPIDER_NET_GDTRSERINT: problem, print a message */
1505 /* case SPIDER_NET_GDDRSERINT: problem, print a message */
1506 /* case SPIDER_NET_GDCRSERINT: problem, print a message */
1507 /* case SPIDER_NET_GDBRSERINT: problem, print a message */
1508 /* case SPIDER_NET_GDARSERINT: problem, print a message */
1509 /* case SPIDER_NET_GDSERINT: problem, print a message */
1510 /* case SPIDER_NET_GDTPTERINT: problem, print a message */
1511 /* case SPIDER_NET_GDDPTERINT: problem, print a message */
1512 /* case SPIDER_NET_GDCPTERINT: problem, print a message */
1513 /* case SPIDER_NET_GDBPTERINT: problem, print a message */
1514 /* case SPIDER_NET_GDAPTERINT: problem, print a message */
1515 default:
1516 show_error = 1;
1517 break;
1518 }
1519
1520 /* check GHIINT2STS ************************************/
1521 if (error_reg2)
1522 for (i = 0; i < 32; i++)
1523 if (error_reg2 & (1<<i))
1524 switch (i)
1525 {
1526 /* there is nothing we can (want to) do at this time. Log a
1527 * message, we can switch on and off the specific values later on
1528 case SPIDER_NET_GPROPERINT:
1529 case SPIDER_NET_GMCTCRSNGINT:
1530 case SPIDER_NET_GMCTLCOLINT:
1531 case SPIDER_NET_GMCTTMOTINT:
1532 case SPIDER_NET_GMCRCAERINT:
1533 case SPIDER_NET_GMCRCALERINT:
1534 case SPIDER_NET_GMCRALNERINT:
1535 case SPIDER_NET_GMCROVRINT:
1536 case SPIDER_NET_GMCRRNTINT:
1537 case SPIDER_NET_GMCRRXERINT:
1538 case SPIDER_NET_GTITCSERINT:
1539 case SPIDER_NET_GTIFMTERINT:
1540 case SPIDER_NET_GTIPKTRVKINT:
1541 case SPIDER_NET_GTISPINGINT:
1542 case SPIDER_NET_GTISADNGINT:
1543 case SPIDER_NET_GTISPDNGINT:
1544 case SPIDER_NET_GRIFMTERINT:
1545 case SPIDER_NET_GRIPKTRVKINT:
1546 case SPIDER_NET_GRISPINGINT:
1547 case SPIDER_NET_GRISADNGINT:
1548 case SPIDER_NET_GRISPDNGINT:
1549 break;
1550 */
1551 default:
1552 break;
1553 }
1554
1555 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
1556 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
1557 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1558 status_reg, error_reg1, error_reg2);
1559
1560 /* clear interrupt sources */
1561 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
1562 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
1563}
1564
1565/**
1566 * spider_net_interrupt - interrupt handler for spider_net
1567 * @irq: interrupt number
1568 * @ptr: pointer to net_device
1569 *
1570 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
1571 * interrupt found raised by card.
1572 *
1573 * This is the interrupt handler, that turns off
1574 * interrupts for this device and makes the stack poll the driver
1575 */
1576static irqreturn_t
1577spider_net_interrupt(int irq, void *ptr)
1578{
1579 struct net_device *netdev = ptr;
1580 struct spider_net_card *card = netdev_priv(netdev);
1581 u32 status_reg, error_reg1, error_reg2;
1582
1583 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
1584 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
1585 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
1586
1587 if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
1588 !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
1589 !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
1590 return IRQ_NONE;
1591
1592 if (status_reg & SPIDER_NET_RXINT ) {
1593 spider_net_rx_irq_off(card);
1594 napi_schedule(&card->napi);
1595 card->num_rx_ints ++;
1596 }
1597 if (status_reg & SPIDER_NET_TXINT)
1598 napi_schedule(&card->napi);
1599
1600 if (status_reg & SPIDER_NET_LINKINT)
1601 spider_net_link_reset(netdev);
1602
1603 if (status_reg & SPIDER_NET_ERRINT )
1604 spider_net_handle_error_irq(card, status_reg,
1605 error_reg1, error_reg2);
1606
1607 /* clear interrupt sources */
1608 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
1609
1610 return IRQ_HANDLED;
1611}
1612
1613#ifdef CONFIG_NET_POLL_CONTROLLER
1614/**
1615 * spider_net_poll_controller - artificial interrupt for netconsole etc.
1616 * @netdev: interface device structure
1617 *
1618 * see Documentation/networking/netconsole.txt
1619 */
1620static void
1621spider_net_poll_controller(struct net_device *netdev)
1622{
1623 disable_irq(netdev->irq);
1624 spider_net_interrupt(netdev->irq, netdev);
1625 enable_irq(netdev->irq);
1626}
1627#endif /* CONFIG_NET_POLL_CONTROLLER */
1628
1629/**
1630 * spider_net_enable_interrupts - enable interrupts
1631 * @card: card structure
1632 *
1633 * spider_net_enable_interrupt enables several interrupts
1634 */
1635static void
1636spider_net_enable_interrupts(struct spider_net_card *card)
1637{
1638 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
1639 SPIDER_NET_INT0_MASK_VALUE);
1640 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
1641 SPIDER_NET_INT1_MASK_VALUE);
1642 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
1643 SPIDER_NET_INT2_MASK_VALUE);
1644}
1645
1646/**
1647 * spider_net_disable_interrupts - disable interrupts
1648 * @card: card structure
1649 *
1650 * spider_net_disable_interrupts disables all the interrupts
1651 */
1652static void
1653spider_net_disable_interrupts(struct spider_net_card *card)
1654{
1655 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
1656 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
1657 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
1658 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1659}
1660
1661/**
1662 * spider_net_init_card - initializes the card
1663 * @card: card structure
1664 *
1665 * spider_net_init_card initializes the card so that other registers can
1666 * be used
1667 */
1668static void
1669spider_net_init_card(struct spider_net_card *card)
1670{
1671 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1672 SPIDER_NET_CKRCTRL_STOP_VALUE);
1673
1674 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1675 SPIDER_NET_CKRCTRL_RUN_VALUE);
1676
1677 /* trigger ETOMOD signal */
1678 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1679 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
1680
1681 spider_net_disable_interrupts(card);
1682}
1683
1684/**
1685 * spider_net_enable_card - enables the card by setting all kinds of regs
1686 * @card: card structure
1687 *
1688 * spider_net_enable_card sets a lot of SMMIO registers to enable the device
1689 */
1690static void
1691spider_net_enable_card(struct spider_net_card *card)
1692{
1693 int i;
1694 /* the following array consists of (register),(value) pairs
1695 * that are set in this function. A register of 0 ends the list */
1696 u32 regs[][2] = {
1697 { SPIDER_NET_GRESUMINTNUM, 0 },
1698 { SPIDER_NET_GREINTNUM, 0 },
1699
1700 /* set interrupt frame number registers */
1701 /* clear the single DMA engine registers first */
1702 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1703 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1704 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1705 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1706 /* then set, what we really need */
1707 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
1708
1709 /* timer counter registers and stuff */
1710 { SPIDER_NET_GFREECNNUM, 0 },
1711 { SPIDER_NET_GONETIMENUM, 0 },
1712 { SPIDER_NET_GTOUTFRMNUM, 0 },
1713
1714 /* RX mode setting */
1715 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
1716 /* TX mode setting */
1717 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
1718 /* IPSEC mode setting */
1719 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
1720
1721 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
1722
1723 { SPIDER_NET_GMRWOLCTRL, 0 },
1724 { SPIDER_NET_GTESTMD, 0x10000000 },
1725 { SPIDER_NET_GTTQMSK, 0x00400040 },
1726
1727 { SPIDER_NET_GMACINTEN, 0 },
1728
1729 /* flow control stuff */
1730 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
1731 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
1732
1733 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
1734 { 0, 0}
1735 };
1736
1737 i = 0;
1738 while (regs[i][0]) {
1739 spider_net_write_reg(card, regs[i][0], regs[i][1]);
1740 i++;
1741 }
1742
1743 /* clear unicast filter table entries 1 to 14 */
1744 for (i = 1; i <= 14; i++) {
1745 spider_net_write_reg(card,
1746 SPIDER_NET_GMRUAFILnR + i * 8,
1747 0x00080000);
1748 spider_net_write_reg(card,
1749 SPIDER_NET_GMRUAFILnR + i * 8 + 4,
1750 0x00000000);
1751 }
1752
1753 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
1754
1755 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
1756
1757 /* set chain tail address for RX chains and
1758 * enable DMA */
1759 spider_net_enable_rxchtails(card);
1760 spider_net_enable_rxdmac(card);
1761
1762 spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
1763
1764 spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
1765 SPIDER_NET_LENLMT_VALUE);
1766 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1767 SPIDER_NET_OPMODE_VALUE);
1768
1769 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
1770 SPIDER_NET_GDTBSTA);
1771}
1772
1773/**
1774 * spider_net_download_firmware - loads firmware into the adapter
1775 * @card: card structure
1776 * @firmware_ptr: pointer to firmware data
1777 *
1778 * spider_net_download_firmware loads the firmware data into the
1779 * adapter. It assumes the length etc. to be allright.
1780 */
1781static int
1782spider_net_download_firmware(struct spider_net_card *card,
1783 const void *firmware_ptr)
1784{
1785 int sequencer, i;
1786 const u32 *fw_ptr = firmware_ptr;
1787
1788 /* stop sequencers */
1789 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1790 SPIDER_NET_STOP_SEQ_VALUE);
1791
1792 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
1793 sequencer++) {
1794 spider_net_write_reg(card,
1795 SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
1796 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1797 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
1798 sequencer * 8, *fw_ptr);
1799 fw_ptr++;
1800 }
1801 }
1802
1803 if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
1804 return -EIO;
1805
1806 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1807 SPIDER_NET_RUN_SEQ_VALUE);
1808
1809 return 0;
1810}
1811
1812/**
1813 * spider_net_init_firmware - reads in firmware parts
1814 * @card: card structure
1815 *
1816 * Returns 0 on success, <0 on failure
1817 *
1818 * spider_net_init_firmware opens the sequencer firmware and does some basic
1819 * checks. This function opens and releases the firmware structure. A call
1820 * to download the firmware is performed before the release.
1821 *
1822 * Firmware format
1823 * ===============
1824 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
1825 * the program for each sequencer. Use the command
1826 * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \
1827 * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \
1828 * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
1829 *
1830 * to generate spider_fw.bin, if you have sequencer programs with something
1831 * like the following contents for each sequencer:
1832 * <ONE LINE COMMENT>
1833 * <FIRST 4-BYTES-WORD FOR SEQUENCER>
1834 * <SECOND 4-BYTES-WORD FOR SEQUENCER>
1835 * ...
1836 * <1024th 4-BYTES-WORD FOR SEQUENCER>
1837 */
1838static int
1839spider_net_init_firmware(struct spider_net_card *card)
1840{
1841 struct firmware *firmware = NULL;
1842 struct device_node *dn;
1843 const u8 *fw_prop = NULL;
1844 int err = -ENOENT;
1845 int fw_size;
1846
1847 if (request_firmware((const struct firmware **)&firmware,
1848 SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
1849 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
1850 netif_msg_probe(card) ) {
1851 dev_err(&card->netdev->dev,
1852 "Incorrect size of spidernet firmware in " \
1853 "filesystem. Looking in host firmware...\n");
1854 goto try_host_fw;
1855 }
1856 err = spider_net_download_firmware(card, firmware->data);
1857
1858 release_firmware(firmware);
1859 if (err)
1860 goto try_host_fw;
1861
1862 goto done;
1863 }
1864
1865try_host_fw:
1866 dn = pci_device_to_OF_node(card->pdev);
1867 if (!dn)
1868 goto out_err;
1869
1870 fw_prop = of_get_property(dn, "firmware", &fw_size);
1871 if (!fw_prop)
1872 goto out_err;
1873
1874 if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
1875 netif_msg_probe(card) ) {
1876 dev_err(&card->netdev->dev,
1877 "Incorrect size of spidernet firmware in host firmware\n");
1878 goto done;
1879 }
1880
1881 err = spider_net_download_firmware(card, fw_prop);
1882
1883done:
1884 return err;
1885out_err:
1886 if (netif_msg_probe(card))
1887 dev_err(&card->netdev->dev,
1888 "Couldn't find spidernet firmware in filesystem " \
1889 "or host firmware\n");
1890 return err;
1891}
1892
1893/**
1894 * spider_net_open - called upon ifonfig up
1895 * @netdev: interface device structure
1896 *
1897 * returns 0 on success, <0 on failure
1898 *
1899 * spider_net_open allocates all the descriptors and memory needed for
1900 * operation, sets up multicast list and enables interrupts
1901 */
1902int
1903spider_net_open(struct net_device *netdev)
1904{
1905 struct spider_net_card *card = netdev_priv(netdev);
1906 int result;
1907
1908 result = spider_net_init_firmware(card);
1909 if (result)
1910 goto init_firmware_failed;
1911
1912 /* start probing with copper */
1913 card->aneg_count = 0;
1914 card->medium = BCM54XX_COPPER;
1915 spider_net_setup_aneg(card);
1916 if (card->phy.def->phy_id)
1917 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1918
1919 result = spider_net_init_chain(card, &card->tx_chain);
1920 if (result)
1921 goto alloc_tx_failed;
1922 card->low_watermark = NULL;
1923
1924 result = spider_net_init_chain(card, &card->rx_chain);
1925 if (result)
1926 goto alloc_rx_failed;
1927
1928 /* Allocate rx skbs */
1929 result = spider_net_alloc_rx_skbs(card);
1930 if (result)
1931 goto alloc_skbs_failed;
1932
1933 spider_net_set_multi(netdev);
1934
1935 /* further enhancement: setup hw vlan, if needed */
1936
1937 result = -EBUSY;
1938 if (request_irq(netdev->irq, spider_net_interrupt,
1939 IRQF_SHARED, netdev->name, netdev))
1940 goto register_int_failed;
1941
1942 spider_net_enable_card(card);
1943
1944 netif_start_queue(netdev);
1945 netif_carrier_on(netdev);
1946 napi_enable(&card->napi);
1947
1948 spider_net_enable_interrupts(card);
1949
1950 return 0;
1951
1952register_int_failed:
1953 spider_net_free_rx_chain_contents(card);
1954alloc_skbs_failed:
1955 spider_net_free_chain(card, &card->rx_chain);
1956alloc_rx_failed:
1957 spider_net_free_chain(card, &card->tx_chain);
1958alloc_tx_failed:
1959 del_timer_sync(&card->aneg_timer);
1960init_firmware_failed:
1961 return result;
1962}
1963
1964/**
1965 * spider_net_link_phy
1966 * @data: used for pointer to card structure
1967 *
1968 */
1969static void spider_net_link_phy(struct timer_list *t)
1970{
1971 struct spider_net_card *card = from_timer(card, t, aneg_timer);
1972 struct mii_phy *phy = &card->phy;
1973
1974 /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
1975 if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
1976
1977 pr_debug("%s: link is down trying to bring it up\n",
1978 card->netdev->name);
1979
1980 switch (card->medium) {
1981 case BCM54XX_COPPER:
1982 /* enable fiber with autonegotiation first */
1983 if (phy->def->ops->enable_fiber)
1984 phy->def->ops->enable_fiber(phy, 1);
1985 card->medium = BCM54XX_FIBER;
1986 break;
1987
1988 case BCM54XX_FIBER:
1989 /* fiber didn't come up, try to disable fiber autoneg */
1990 if (phy->def->ops->enable_fiber)
1991 phy->def->ops->enable_fiber(phy, 0);
1992 card->medium = BCM54XX_UNKNOWN;
1993 break;
1994
1995 case BCM54XX_UNKNOWN:
1996 /* copper, fiber with and without failed,
1997 * retry from beginning */
1998 spider_net_setup_aneg(card);
1999 card->medium = BCM54XX_COPPER;
2000 break;
2001 }
2002
2003 card->aneg_count = 0;
2004 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2005 return;
2006 }
2007
2008 /* link still not up, try again later */
2009 if (!(phy->def->ops->poll_link(phy))) {
2010 card->aneg_count++;
2011 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2012 return;
2013 }
2014
2015 /* link came up, get abilities */
2016 phy->def->ops->read_link(phy);
2017
2018 spider_net_write_reg(card, SPIDER_NET_GMACST,
2019 spider_net_read_reg(card, SPIDER_NET_GMACST));
2020 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
2021
2022 if (phy->speed == 1000)
2023 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
2024 else
2025 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
2026
2027 card->aneg_count = 0;
2028
2029 pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n",
2030 card->netdev->name, phy->speed,
2031 phy->duplex == 1 ? "Full" : "Half",
2032 phy->autoneg == 1 ? "" : "no ");
2033}
2034
2035/**
2036 * spider_net_setup_phy - setup PHY
2037 * @card: card structure
2038 *
2039 * returns 0 on success, <0 on failure
2040 *
2041 * spider_net_setup_phy is used as part of spider_net_probe.
2042 **/
2043static int
2044spider_net_setup_phy(struct spider_net_card *card)
2045{
2046 struct mii_phy *phy = &card->phy;
2047
2048 spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
2049 SPIDER_NET_DMASEL_VALUE);
2050 spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
2051 SPIDER_NET_PHY_CTRL_VALUE);
2052
2053 phy->dev = card->netdev;
2054 phy->mdio_read = spider_net_read_phy;
2055 phy->mdio_write = spider_net_write_phy;
2056
2057 for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
2058 unsigned short id;
2059 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
2060 if (id != 0x0000 && id != 0xffff) {
2061 if (!sungem_phy_probe(phy, phy->mii_id)) {
2062 pr_info("Found %s.\n", phy->def->name);
2063 break;
2064 }
2065 }
2066 }
2067
2068 return 0;
2069}
2070
2071/**
2072 * spider_net_workaround_rxramfull - work around firmware bug
2073 * @card: card structure
2074 *
2075 * no return value
2076 **/
2077static void
2078spider_net_workaround_rxramfull(struct spider_net_card *card)
2079{
2080 int i, sequencer = 0;
2081
2082 /* cancel reset */
2083 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2084 SPIDER_NET_CKRCTRL_RUN_VALUE);
2085
2086 /* empty sequencer data */
2087 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
2088 sequencer++) {
2089 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
2090 sequencer * 8, 0x0);
2091 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
2092 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
2093 sequencer * 8, 0x0);
2094 }
2095 }
2096
2097 /* set sequencer operation */
2098 spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
2099
2100 /* reset */
2101 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2102 SPIDER_NET_CKRCTRL_STOP_VALUE);
2103}
2104
2105/**
2106 * spider_net_stop - called upon ifconfig down
2107 * @netdev: interface device structure
2108 *
2109 * always returns 0
2110 */
2111int
2112spider_net_stop(struct net_device *netdev)
2113{
2114 struct spider_net_card *card = netdev_priv(netdev);
2115
2116 napi_disable(&card->napi);
2117 netif_carrier_off(netdev);
2118 netif_stop_queue(netdev);
2119 del_timer_sync(&card->tx_timer);
2120 del_timer_sync(&card->aneg_timer);
2121
2122 spider_net_disable_interrupts(card);
2123
2124 free_irq(netdev->irq, netdev);
2125
2126 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
2127 SPIDER_NET_DMA_TX_FEND_VALUE);
2128
2129 /* turn off DMA, force end */
2130 spider_net_disable_rxdmac(card);
2131
2132 /* release chains */
2133 spider_net_release_tx_chain(card, 1);
2134 spider_net_free_rx_chain_contents(card);
2135
2136 spider_net_free_chain(card, &card->tx_chain);
2137 spider_net_free_chain(card, &card->rx_chain);
2138
2139 return 0;
2140}
2141
2142/**
2143 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
2144 * function (to be called not under interrupt status)
2145 * @data: data, is interface device structure
2146 *
2147 * called as task when tx hangs, resets interface (if interface is up)
2148 */
2149static void
2150spider_net_tx_timeout_task(struct work_struct *work)
2151{
2152 struct spider_net_card *card =
2153 container_of(work, struct spider_net_card, tx_timeout_task);
2154 struct net_device *netdev = card->netdev;
2155
2156 if (!(netdev->flags & IFF_UP))
2157 goto out;
2158
2159 netif_device_detach(netdev);
2160 spider_net_stop(netdev);
2161
2162 spider_net_workaround_rxramfull(card);
2163 spider_net_init_card(card);
2164
2165 if (spider_net_setup_phy(card))
2166 goto out;
2167
2168 spider_net_open(netdev);
2169 spider_net_kick_tx_dma(card);
2170 netif_device_attach(netdev);
2171
2172out:
2173 atomic_dec(&card->tx_timeout_task_counter);
2174}
2175
2176/**
2177 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
2178 * @netdev: interface device structure
2179 *
2180 * called, if tx hangs. Schedules a task that resets the interface
2181 */
2182static void
2183spider_net_tx_timeout(struct net_device *netdev)
2184{
2185 struct spider_net_card *card;
2186
2187 card = netdev_priv(netdev);
2188 atomic_inc(&card->tx_timeout_task_counter);
2189 if (netdev->flags & IFF_UP)
2190 schedule_work(&card->tx_timeout_task);
2191 else
2192 atomic_dec(&card->tx_timeout_task_counter);
2193 card->spider_stats.tx_timeouts++;
2194}
2195
2196static const struct net_device_ops spider_net_ops = {
2197 .ndo_open = spider_net_open,
2198 .ndo_stop = spider_net_stop,
2199 .ndo_start_xmit = spider_net_xmit,
2200 .ndo_set_rx_mode = spider_net_set_multi,
2201 .ndo_set_mac_address = spider_net_set_mac,
2202 .ndo_do_ioctl = spider_net_do_ioctl,
2203 .ndo_tx_timeout = spider_net_tx_timeout,
2204 .ndo_validate_addr = eth_validate_addr,
2205 /* HW VLAN */
2206#ifdef CONFIG_NET_POLL_CONTROLLER
2207 /* poll controller */
2208 .ndo_poll_controller = spider_net_poll_controller,
2209#endif /* CONFIG_NET_POLL_CONTROLLER */
2210};
2211
2212/**
2213 * spider_net_setup_netdev_ops - initialization of net_device operations
2214 * @netdev: net_device structure
2215 *
2216 * fills out function pointers in the net_device structure
2217 */
2218static void
2219spider_net_setup_netdev_ops(struct net_device *netdev)
2220{
2221 netdev->netdev_ops = &spider_net_ops;
2222 netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
2223 /* ethtool ops */
2224 netdev->ethtool_ops = &spider_net_ethtool_ops;
2225}
2226
2227/**
2228 * spider_net_setup_netdev - initialization of net_device
2229 * @card: card structure
2230 *
2231 * Returns 0 on success or <0 on failure
2232 *
2233 * spider_net_setup_netdev initializes the net_device structure
2234 **/
2235static int
2236spider_net_setup_netdev(struct spider_net_card *card)
2237{
2238 int result;
2239 struct net_device *netdev = card->netdev;
2240 struct device_node *dn;
2241 struct sockaddr addr;
2242 const u8 *mac;
2243
2244 SET_NETDEV_DEV(netdev, &card->pdev->dev);
2245
2246 pci_set_drvdata(card->pdev, netdev);
2247
2248 timer_setup(&card->tx_timer, spider_net_cleanup_tx_ring, 0);
2249 netdev->irq = card->pdev->irq;
2250
2251 card->aneg_count = 0;
2252 timer_setup(&card->aneg_timer, spider_net_link_phy, 0);
2253
2254 netif_napi_add(netdev, &card->napi,
2255 spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
2256
2257 spider_net_setup_netdev_ops(netdev);
2258
2259 netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
2260 if (SPIDER_NET_RX_CSUM_DEFAULT)
2261 netdev->features |= NETIF_F_RXCSUM;
2262 netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
2263 /* some time: NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX |
2264 * NETIF_F_HW_VLAN_CTAG_FILTER */
2265
2266 /* MTU range: 64 - 2294 */
2267 netdev->min_mtu = SPIDER_NET_MIN_MTU;
2268 netdev->max_mtu = SPIDER_NET_MAX_MTU;
2269
2270 netdev->irq = card->pdev->irq;
2271 card->num_rx_ints = 0;
2272 card->ignore_rx_ramfull = 0;
2273
2274 dn = pci_device_to_OF_node(card->pdev);
2275 if (!dn)
2276 return -EIO;
2277
2278 mac = of_get_property(dn, "local-mac-address", NULL);
2279 if (!mac)
2280 return -EIO;
2281 memcpy(addr.sa_data, mac, ETH_ALEN);
2282
2283 result = spider_net_set_mac(netdev, &addr);
2284 if ((result) && (netif_msg_probe(card)))
2285 dev_err(&card->netdev->dev,
2286 "Failed to set MAC address: %i\n", result);
2287
2288 result = register_netdev(netdev);
2289 if (result) {
2290 if (netif_msg_probe(card))
2291 dev_err(&card->netdev->dev,
2292 "Couldn't register net_device: %i\n", result);
2293 return result;
2294 }
2295
2296 if (netif_msg_probe(card))
2297 pr_info("Initialized device %s.\n", netdev->name);
2298
2299 return 0;
2300}
2301
2302/**
2303 * spider_net_alloc_card - allocates net_device and card structure
2304 *
2305 * returns the card structure or NULL in case of errors
2306 *
2307 * the card and net_device structures are linked to each other
2308 */
2309static struct spider_net_card *
2310spider_net_alloc_card(void)
2311{
2312 struct net_device *netdev;
2313 struct spider_net_card *card;
2314
2315 netdev = alloc_etherdev(struct_size(card, darray,
2316 tx_descriptors + rx_descriptors));
2317 if (!netdev)
2318 return NULL;
2319
2320 card = netdev_priv(netdev);
2321 card->netdev = netdev;
2322 card->msg_enable = SPIDER_NET_DEFAULT_MSG;
2323 INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
2324 init_waitqueue_head(&card->waitq);
2325 atomic_set(&card->tx_timeout_task_counter, 0);
2326
2327 card->rx_chain.num_desc = rx_descriptors;
2328 card->rx_chain.ring = card->darray;
2329 card->tx_chain.num_desc = tx_descriptors;
2330 card->tx_chain.ring = card->darray + rx_descriptors;
2331
2332 return card;
2333}
2334
2335/**
2336 * spider_net_undo_pci_setup - releases PCI ressources
2337 * @card: card structure
2338 *
2339 * spider_net_undo_pci_setup releases the mapped regions
2340 */
2341static void
2342spider_net_undo_pci_setup(struct spider_net_card *card)
2343{
2344 iounmap(card->regs);
2345 pci_release_regions(card->pdev);
2346}
2347
2348/**
2349 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
2350 * @pdev: PCI device
2351 *
2352 * Returns the card structure or NULL if any errors occur
2353 *
2354 * spider_net_setup_pci_dev initializes pdev and together with the
2355 * functions called in spider_net_open configures the device so that
2356 * data can be transferred over it
2357 * The net_device structure is attached to the card structure, if the
2358 * function returns without error.
2359 **/
2360static struct spider_net_card *
2361spider_net_setup_pci_dev(struct pci_dev *pdev)
2362{
2363 struct spider_net_card *card;
2364 unsigned long mmio_start, mmio_len;
2365
2366 if (pci_enable_device(pdev)) {
2367 dev_err(&pdev->dev, "Couldn't enable PCI device\n");
2368 return NULL;
2369 }
2370
2371 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
2372 dev_err(&pdev->dev,
2373 "Couldn't find proper PCI device base address.\n");
2374 goto out_disable_dev;
2375 }
2376
2377 if (pci_request_regions(pdev, spider_net_driver_name)) {
2378 dev_err(&pdev->dev,
2379 "Couldn't obtain PCI resources, aborting.\n");
2380 goto out_disable_dev;
2381 }
2382
2383 pci_set_master(pdev);
2384
2385 card = spider_net_alloc_card();
2386 if (!card) {
2387 dev_err(&pdev->dev,
2388 "Couldn't allocate net_device structure, aborting.\n");
2389 goto out_release_regions;
2390 }
2391 card->pdev = pdev;
2392
2393 /* fetch base address and length of first resource */
2394 mmio_start = pci_resource_start(pdev, 0);
2395 mmio_len = pci_resource_len(pdev, 0);
2396
2397 card->netdev->mem_start = mmio_start;
2398 card->netdev->mem_end = mmio_start + mmio_len;
2399 card->regs = ioremap(mmio_start, mmio_len);
2400
2401 if (!card->regs) {
2402 dev_err(&pdev->dev,
2403 "Couldn't obtain PCI resources, aborting.\n");
2404 goto out_release_regions;
2405 }
2406
2407 return card;
2408
2409out_release_regions:
2410 pci_release_regions(pdev);
2411out_disable_dev:
2412 pci_disable_device(pdev);
2413 return NULL;
2414}
2415
2416/**
2417 * spider_net_probe - initialization of a device
2418 * @pdev: PCI device
2419 * @ent: entry in the device id list
2420 *
2421 * Returns 0 on success, <0 on failure
2422 *
2423 * spider_net_probe initializes pdev and registers a net_device
2424 * structure for it. After that, the device can be ifconfig'ed up
2425 **/
2426static int
2427spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2428{
2429 int err = -EIO;
2430 struct spider_net_card *card;
2431
2432 card = spider_net_setup_pci_dev(pdev);
2433 if (!card)
2434 goto out;
2435
2436 spider_net_workaround_rxramfull(card);
2437 spider_net_init_card(card);
2438
2439 err = spider_net_setup_phy(card);
2440 if (err)
2441 goto out_undo_pci;
2442
2443 err = spider_net_setup_netdev(card);
2444 if (err)
2445 goto out_undo_pci;
2446
2447 return 0;
2448
2449out_undo_pci:
2450 spider_net_undo_pci_setup(card);
2451 free_netdev(card->netdev);
2452out:
2453 return err;
2454}
2455
2456/**
2457 * spider_net_remove - removal of a device
2458 * @pdev: PCI device
2459 *
2460 * Returns 0 on success, <0 on failure
2461 *
2462 * spider_net_remove is called to remove the device and unregisters the
2463 * net_device
2464 **/
2465static void
2466spider_net_remove(struct pci_dev *pdev)
2467{
2468 struct net_device *netdev;
2469 struct spider_net_card *card;
2470
2471 netdev = pci_get_drvdata(pdev);
2472 card = netdev_priv(netdev);
2473
2474 wait_event(card->waitq,
2475 atomic_read(&card->tx_timeout_task_counter) == 0);
2476
2477 unregister_netdev(netdev);
2478
2479 /* switch off card */
2480 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2481 SPIDER_NET_CKRCTRL_STOP_VALUE);
2482 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2483 SPIDER_NET_CKRCTRL_RUN_VALUE);
2484
2485 spider_net_undo_pci_setup(card);
2486 free_netdev(netdev);
2487}
2488
2489static struct pci_driver spider_net_driver = {
2490 .name = spider_net_driver_name,
2491 .id_table = spider_net_pci_tbl,
2492 .probe = spider_net_probe,
2493 .remove = spider_net_remove
2494};
2495
2496/**
2497 * spider_net_init - init function when the driver is loaded
2498 *
2499 * spider_net_init registers the device driver
2500 */
2501static int __init spider_net_init(void)
2502{
2503 printk(KERN_INFO "Spidernet version %s.\n", VERSION);
2504
2505 if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
2506 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
2507 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2508 }
2509 if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
2510 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
2511 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2512 }
2513 if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
2514 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
2515 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2516 }
2517 if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
2518 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
2519 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2520 }
2521
2522 return pci_register_driver(&spider_net_driver);
2523}
2524
2525/**
2526 * spider_net_cleanup - exit function when driver is unloaded
2527 *
2528 * spider_net_cleanup unregisters the device driver
2529 */
2530static void __exit spider_net_cleanup(void)
2531{
2532 pci_unregister_driver(&spider_net_driver);
2533}
2534
2535module_init(spider_net_init);
2536module_exit(spider_net_cleanup);