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Merge branch 'next/cross-platform' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / net / spider_net.c
CommitLineData
aaec0fab 1/*
3342cf0e 2 * Network device driver for Cell Processor-Based Blade and Celleb platform
aaec0fab
JO		 3 *
4 * (C) Copyright IBM Corp. 2005
3342cf0e 5 * (C) Copyright 2006 TOSHIBA CORPORATION
aaec0fab
JO		 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
aaec0fab
JO		 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>
7c5c220e 32#include <linux/in.h>
aaec0fab 33#include <linux/init.h>
a6b7a407 34#include <linux/interrupt.h>
5a0e3ad6 35#include <linux/gfp.h>
aaec0fab
JO		 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>
aaec0fab
JO		 45#include <linux/tcp.h>
46#include <linux/types.h>
11f1a52b 47#include <linux/vmalloc.h>
aaec0fab
JO		 48#include <linux/wait.h>
49#include <linux/workqueue.h>
1977f032 50#include <linux/bitops.h>
aaec0fab
JO		 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");
90f10841 60MODULE_VERSION(VERSION);
866691a2 61MODULE_FIRMWARE(SPIDER_NET_FIRMWARE_NAME);
aaec0fab
JO		 62
63static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
64static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
65
e2874f2e
LV		 66module_param(rx_descriptors, int, 0444);
67module_param(tx_descriptors, int, 0444);
aaec0fab
JO		 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
a3aa1884 76static DEFINE_PCI_DEVICE_TABLE(spider_net_pci_tbl) = {
aaec0fab
JO		 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 */
bdd01503 91static inline u32
aaec0fab
JO		 92spider_net_read_reg(struct spider_net_card *card, u32 reg)
93{
3bc0f40c
BH		 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);
aaec0fab
JO		 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 */
bdd01503 107static inline void
aaec0fab
JO		 108spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
109{
3bc0f40c
BH		 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);
aaec0fab
JO		 115}
116
aaec0fab
JO		 117/** spider_net_write_phy - write to phy register
118 * @netdev: adapter to be written to
119 * @mii_id: id of MII
120 * @reg: PHY register
121 * @val: value to be written to phy register
122 *
123 * spider_net_write_phy_register writes to an arbitrary PHY
124 * register via the spider GPCWOPCMD register. We assume the queue does
125 * not run full (not more than 15 commands outstanding).
126 **/
127static void
128spider_net_write_phy(struct net_device *netdev, int mii_id,
129 int reg, int val)
130{
131 struct spider_net_card *card = netdev_priv(netdev);
132 u32 writevalue;
133
134 writevalue = ((u32)mii_id << 21) |
135 ((u32)reg << 16) | ((u32)val);
136
137 spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
138}
139
140/** spider_net_read_phy - read from phy register
141 * @netdev: network device to be read from
142 * @mii_id: id of MII
143 * @reg: PHY register
144 *
145 * Returns value read from PHY register
146 *
147 * spider_net_write_phy reads from an arbitrary PHY
148 * register via the spider GPCROPCMD register
149 **/
150static int
151spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
152{
153 struct spider_net_card *card = netdev_priv(netdev);
154 u32 readvalue;
155
156 readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
157 spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
158
159 /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
160 * interrupt, as we poll for the completion of the read operation
161 * in spider_net_read_phy. Should take about 50 us */
162 do {
163 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
164 } while (readvalue & SPIDER_NET_GPREXEC);
165
166 readvalue &= SPIDER_NET_GPRDAT_MASK;
167
168 return readvalue;
169}
170
abdb66b5
KI		 171/**
172 * spider_net_setup_aneg - initial auto-negotiation setup
173 * @card: device structure
174 **/
175static void
176spider_net_setup_aneg(struct spider_net_card *card)
177{
178 struct mii_phy *phy = &card->phy;
179 u32 advertise = 0;
a1c38a4a 180 u16 bmsr, estat;
abdb66b5 181
a1c38a4a
IK		 182 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
183 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
abdb66b5
KI		 184
185 if (bmsr & BMSR_10HALF)
186 advertise |= ADVERTISED_10baseT_Half;
187 if (bmsr & BMSR_10FULL)
188 advertise |= ADVERTISED_10baseT_Full;
189 if (bmsr & BMSR_100HALF)
190 advertise |= ADVERTISED_100baseT_Half;
191 if (bmsr & BMSR_100FULL)
192 advertise |= ADVERTISED_100baseT_Full;
193
194 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
195 advertise |= SUPPORTED_1000baseT_Full;
196 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
197 advertise |= SUPPORTED_1000baseT_Half;
198
199 mii_phy_probe(phy, phy->mii_id);
200 phy->def->ops->setup_aneg(phy, advertise);
201
202}
203
aaec0fab 204/**
11f1a52b 205 * spider_net_rx_irq_off - switch off rx irq on this spider card
aaec0fab
JO		 206 * @card: device structure
207 *
11f1a52b 208 * switches off rx irq by masking them out in the GHIINTnMSK register
aaec0fab
JO		 209 */
210static void
11f1a52b 211spider_net_rx_irq_off(struct spider_net_card *card)
aaec0fab
JO		 212{
213 u32 regvalue;
aaec0fab 214
11f1a52b
AB		 215 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
216 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
aaec0fab
JO		 217}
218
219/**
11f1a52b 220 * spider_net_rx_irq_on - switch on rx irq on this spider card
aaec0fab
JO		 221 * @card: device structure
222 *
11f1a52b 223 * switches on rx irq by enabling them in the GHIINTnMSK register
aaec0fab
JO		 224 */
225static void
11f1a52b 226spider_net_rx_irq_on(struct spider_net_card *card)
aaec0fab
JO		 227{
228 u32 regvalue;
aaec0fab 229
11f1a52b
AB		 230 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
231 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
aaec0fab
JO		 232}
233
234/**
235 * spider_net_set_promisc - sets the unicast address or the promiscuous mode
236 * @card: card structure
237 *
238 * spider_net_set_promisc sets the unicast destination address filter and
239 * thus either allows for non-promisc mode or promisc mode
240 */
241static void
242spider_net_set_promisc(struct spider_net_card *card)
243{
244 u32 macu, macl;
245 struct net_device *netdev = card->netdev;
246
247 if (netdev->flags & IFF_PROMISC) {
248 /* clear destination entry 0 */
249 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
250 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
251 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
252 SPIDER_NET_PROMISC_VALUE);
253 } else {
254 macu = netdev->dev_addr[0];
255 macu <<= 8;
256 macu |= netdev->dev_addr[1];
257 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
258
259 macu |= SPIDER_NET_UA_DESCR_VALUE;
260 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
261 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
262 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
263 SPIDER_NET_NONPROMISC_VALUE);
264 }
265}
266
267/**
268 * spider_net_get_mac_address - read mac address from spider card
269 * @card: device structure
270 *
271 * reads MAC address from GMACUNIMACU and GMACUNIMACL registers
272 */
273static int
274spider_net_get_mac_address(struct net_device *netdev)
275{
276 struct spider_net_card *card = netdev_priv(netdev);
277 u32 macl, macu;
278
279 macl = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACL);
280 macu = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACU);
281
282 netdev->dev_addr[0] = (macu >> 24) & 0xff;
283 netdev->dev_addr[1] = (macu >> 16) & 0xff;
284 netdev->dev_addr[2] = (macu >> 8) & 0xff;
285 netdev->dev_addr[3] = macu & 0xff;
286 netdev->dev_addr[4] = (macl >> 8) & 0xff;
287 netdev->dev_addr[5] = macl & 0xff;
288
289 if (!is_valid_ether_addr(&netdev->dev_addr[0]))
290 return -EINVAL;
291
292 return 0;
293}
294
295/**
296 * spider_net_get_descr_status -- returns the status of a descriptor
297 * @descr: descriptor to look at
298 *
299 * returns the status as in the dmac_cmd_status field of the descriptor
300 */
bdd01503 301static inline int
4cb6f9e5 302spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
aaec0fab 303{
4cb6f9e5 304 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
aaec0fab
JO		 305}
306
307/**
308 * spider_net_free_chain - free descriptor chain
309 * @card: card structure
310 * @chain: address of chain
311 *
312 */
313static void
314spider_net_free_chain(struct spider_net_card *card,
315 struct spider_net_descr_chain *chain)
316{
317 struct spider_net_descr *descr;
318
d4ed8f8d
LV		 319 descr = chain->ring;
320 do {
aaec0fab 321 descr->bus_addr = 0;
4cb6f9e5 322 descr->hwdescr->next_descr_addr = 0;
d4ed8f8d
LV		 323 descr = descr->next;
324 } while (descr != chain->ring);
325
326 dma_free_coherent(&card->pdev->dev, chain->num_desc,
4cb6f9e5 327 chain->hwring, chain->dma_addr);
aaec0fab
JO		 328}
329
330/**
d4ed8f8d 331 * spider_net_init_chain - alloc and link descriptor chain
aaec0fab
JO		 332 * @card: card structure
333 * @chain: address of chain
aaec0fab 334 *
d4ed8f8d 335 * We manage a circular list that mirrors the hardware structure,
aaec0fab
JO		 336 * except that the hardware uses bus addresses.
337 *
d4ed8f8d 338 * Returns 0 on success, <0 on failure
aaec0fab
JO		 339 */
340static int
341spider_net_init_chain(struct spider_net_card *card,
d4ed8f8d 342 struct spider_net_descr_chain *chain)
aaec0fab
JO		 343{
344 int i;
345 struct spider_net_descr *descr;
4cb6f9e5 346 struct spider_net_hw_descr *hwdescr;
11f1a52b 347 dma_addr_t buf;
d4ed8f8d 348 size_t alloc_size;
aaec0fab 349
4cb6f9e5 350 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
aaec0fab 351
4cb6f9e5 352 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
d4ed8f8d 353 &chain->dma_addr, GFP_KERNEL);
aaec0fab 354
4cb6f9e5 355 if (!chain->hwring)
d4ed8f8d 356 return -ENOMEM;
aaec0fab 357
4cb6f9e5 358 memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
d4ed8f8d
LV		 359
360 /* Set up the hardware pointers in each descriptor */
4cb6f9e5
LV		 361 descr = chain->ring;
362 hwdescr = chain->hwring;
d4ed8f8d 363 buf = chain->dma_addr;
4cb6f9e5
LV		 364 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
365 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
366 hwdescr->next_descr_addr = 0;
aaec0fab 367
4cb6f9e5 368 descr->hwdescr = hwdescr;
11f1a52b 369 descr->bus_addr = buf;
aaec0fab
JO		 370 descr->next = descr + 1;
371 descr->prev = descr - 1;
372
4cb6f9e5 373 buf += sizeof(struct spider_net_hw_descr);
aaec0fab
JO		 374 }
375 /* do actual circular list */
d4ed8f8d
LV		 376 (descr-1)->next = chain->ring;
377 chain->ring->prev = descr-1;
aaec0fab 378
bdd01503 379 spin_lock_init(&chain->lock);
d4ed8f8d
LV		 380 chain->head = chain->ring;
381 chain->tail = chain->ring;
aaec0fab 382 return 0;
aaec0fab
JO		 383}
384
385/**
386 * spider_net_free_rx_chain_contents - frees descr contents in rx chain
387 * @card: card structure
388 *
389 * returns 0 on success, <0 on failure
390 */
391static void
392spider_net_free_rx_chain_contents(struct spider_net_card *card)
393{
394 struct spider_net_descr *descr;
395
396 descr = card->rx_chain.head;
64751910 397 do {
aaec0fab 398 if (descr->skb) {
4cb6f9e5 399 pci_unmap_single(card->pdev, descr->hwdescr->buf_addr,
11f1a52b 400 SPIDER_NET_MAX_FRAME,
348bc2a6 401 PCI_DMA_BIDIRECTIONAL);
d9c199ee
LV		 402 dev_kfree_skb(descr->skb);
403 descr->skb = NULL;
aaec0fab
JO		 404 }
405 descr = descr->next;
64751910 406 } while (descr != card->rx_chain.head);
aaec0fab
JO		 407}
408
409/**
a4182c50 410 * spider_net_prepare_rx_descr - Reinitialize RX descriptor
aaec0fab
JO		 411 * @card: card structure
412 * @descr: descriptor to re-init
413 *
af901ca1 414 * Return 0 on success, <0 on failure.
aaec0fab 415 *
a4182c50
LV		 416 * Allocates a new rx skb, iommu-maps it and attaches it to the
417 * descriptor. Mark the descriptor as activated, ready-to-use.
aaec0fab
JO		 418 */
419static int
420spider_net_prepare_rx_descr(struct spider_net_card *card,
421 struct spider_net_descr *descr)
422{
4cb6f9e5 423 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
8e0a613b 424 dma_addr_t buf;
aaec0fab
JO		 425 int offset;
426 int bufsize;
427
428 /* we need to round up the buffer size to a multiple of 128 */
11f1a52b 429 bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
aaec0fab
JO		 430 (~(SPIDER_NET_RXBUF_ALIGN - 1));
431
432 /* and we need to have it 128 byte aligned, therefore we allocate a
433 * bit more */
434 /* allocate an skb */
98739407
CH		 435 descr->skb = netdev_alloc_skb(card->netdev,
436 bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
aaec0fab 437 if (!descr->skb) {
11f1a52b 438 if (netif_msg_rx_err(card) && net_ratelimit())
e6311d85
LV		 439 dev_err(&card->netdev->dev,
440 "Not enough memory to allocate rx buffer\n");
9b6b0b81 441 card->spider_stats.alloc_rx_skb_error++;
aaec0fab
JO		 442 return -ENOMEM;
443 }
4cb6f9e5
LV		 444 hwdescr->buf_size = bufsize;
445 hwdescr->result_size = 0;
446 hwdescr->valid_size = 0;
447 hwdescr->data_status = 0;
448 hwdescr->data_error = 0;
aaec0fab
JO		 449
450 offset = ((unsigned long)descr->skb->data) &
451 (SPIDER_NET_RXBUF_ALIGN - 1);
452 if (offset)
453 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
a4182c50 454 /* iommu-map the skb */
8e0a613b 455 buf = pci_map_single(card->pdev, descr->skb->data,
bdd01503 456 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
8d8bb39b 457 if (pci_dma_mapping_error(card->pdev, buf)) {
aaec0fab 458 dev_kfree_skb_any(descr->skb);
d9c199ee 459 descr->skb = NULL;
11f1a52b 460 if (netif_msg_rx_err(card) && net_ratelimit())
e6311d85 461 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
9b6b0b81 462 card->spider_stats.rx_iommu_map_error++;
4cb6f9e5 463 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
aaec0fab 464 } else {
4cb6f9e5 465 hwdescr->buf_addr = buf;
90476a20 466 wmb();
4cb6f9e5 467 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
bdd01503 468 SPIDER_NET_DMAC_NOINTR_COMPLETE;
aaec0fab
JO		 469 }
470
a4182c50 471 return 0;
aaec0fab
JO		 472}
473
474/**
11f1a52b 475 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
aaec0fab
JO		 476 * @card: card structure
477 *
3ad2f3fb 478 * spider_net_enable_rxchtails sets the RX DMAC chain tail addresses in the
aaec0fab
JO		 479 * chip by writing to the appropriate register. DMA is enabled in
480 * spider_net_enable_rxdmac.
481 */
bdd01503 482static inline void
aaec0fab
JO		 483spider_net_enable_rxchtails(struct spider_net_card *card)
484{
485 /* assume chain is aligned correctly */
486 spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
487 card->rx_chain.tail->bus_addr);
488}
489
490/**
491 * spider_net_enable_rxdmac - enables a receive DMA controller
492 * @card: card structure
493 *
494 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
495 * in the GDADMACCNTR register
496 */
bdd01503 497static inline void
aaec0fab
JO		 498spider_net_enable_rxdmac(struct spider_net_card *card)
499{
11f1a52b 500 wmb();
aaec0fab
JO		 501 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
502 SPIDER_NET_DMA_RX_VALUE);
503}
504
59a11f88
LV		 505/**
506 * spider_net_disable_rxdmac - disables the receive DMA controller
507 * @card: card structure
508 *
509 * spider_net_disable_rxdmac terminates processing on the DMA controller
510 * by turing off the DMA controller, with the force-end flag set.
511 */
512static inline void
513spider_net_disable_rxdmac(struct spider_net_card *card)
514{
515 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
516 SPIDER_NET_DMA_RX_FEND_VALUE);
517}
518
aaec0fab
JO		 519/**
520 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
521 * @card: card structure
522 *
11f1a52b 523 * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
aaec0fab
JO		 524 */
525static void
526spider_net_refill_rx_chain(struct spider_net_card *card)
527{
bdd01503
JO		 528 struct spider_net_descr_chain *chain = &card->rx_chain;
529 unsigned long flags;
aaec0fab 530
11f1a52b
AB		 531 /* one context doing the refill (and a second context seeing that
532 * and omitting it) is ok. If called by NAPI, we'll be called again
533 * as spider_net_decode_one_descr is called several times. If some
534 * interrupt calls us, the NAPI is about to clean up anyway. */
bdd01503
JO		 535 if (!spin_trylock_irqsave(&chain->lock, flags))
536 return;
537
4cb6f9e5 538 while (spider_net_get_descr_status(chain->head->hwdescr) ==
bdd01503
JO		 539 SPIDER_NET_DESCR_NOT_IN_USE) {
540 if (spider_net_prepare_rx_descr(card, chain->head))
541 break;
542 chain->head = chain->head->next;
543 }
aaec0fab 544
bdd01503 545 spin_unlock_irqrestore(&chain->lock, flags);
aaec0fab
JO		 546}
547
548/**
2c307db7 549 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
aaec0fab
JO		 550 * @card: card structure
551 *
2c307db7 552 * Returns 0 on success, <0 on failure.
aaec0fab
JO		 553 */
554static int
555spider_net_alloc_rx_skbs(struct spider_net_card *card)
556{
2bf27a0d
LV		 557 struct spider_net_descr_chain *chain = &card->rx_chain;
558 struct spider_net_descr *start = chain->tail;
559 struct spider_net_descr *descr = start;
aaec0fab 560
2bf27a0d
LV		 561 /* Link up the hardware chain pointers */
562 do {
563 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
564 descr = descr->next;
565 } while (descr != start);
aaec0fab 566
2c307db7
LV		 567 /* Put at least one buffer into the chain. if this fails,
568 * we've got a problem. If not, spider_net_refill_rx_chain
569 * will do the rest at the end of this function. */
aaec0fab
JO		 570 if (spider_net_prepare_rx_descr(card, chain->head))
571 goto error;
572 else
573 chain->head = chain->head->next;
574
2c307db7
LV		 575 /* This will allocate the rest of the rx buffers;
576 * if not, it's business as usual later on. */
aaec0fab 577 spider_net_refill_rx_chain(card);
11f1a52b 578 spider_net_enable_rxdmac(card);
aaec0fab
JO		 579 return 0;
580
581error:
582 spider_net_free_rx_chain_contents(card);
2bf27a0d 583 return -ENOMEM;
aaec0fab
JO		 584}
585
aaec0fab
JO		 586/**
587 * spider_net_get_multicast_hash - generates hash for multicast filter table
588 * @addr: multicast address
589 *
590 * returns the hash value.
591 *
592 * spider_net_get_multicast_hash calculates a hash value for a given multicast
593 * address, that is used to set the multicast filter tables
594 */
595static u8
596spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
597{
aaec0fab
JO		 598 u32 crc;
599 u8 hash;
11f1a52b
AB		 600 char addr_for_crc[ETH_ALEN] = { 0, };
601 int i, bit;
602
603 for (i = 0; i < ETH_ALEN * 8; i++) {
604 bit = (addr[i / 8] >> (i % 8)) & 1;
605 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
606 }
aaec0fab 607
11f1a52b 608 crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
aaec0fab
JO		 609
610 hash = (crc >> 27);
611 hash <<= 3;
612 hash |= crc & 7;
11f1a52b 613 hash &= 0xff;
aaec0fab
JO		 614
615 return hash;
616}
617
618/**
619 * spider_net_set_multi - sets multicast addresses and promisc flags
620 * @netdev: interface device structure
621 *
622 * spider_net_set_multi configures multicast addresses as needed for the
623 * netdev interface. It also sets up multicast, allmulti and promisc
624 * flags appropriately
625 */
626static void
627spider_net_set_multi(struct net_device *netdev)
628{
22bedad3 629 struct netdev_hw_addr *ha;
aaec0fab
JO		 630 u8 hash;
631 int i;
632 u32 reg;
633 struct spider_net_card *card = netdev_priv(netdev);
634 unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] =
635 {0, };
636
637 spider_net_set_promisc(card);
638
639 if (netdev->flags & IFF_ALLMULTI) {
640 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
641 set_bit(i, bitmask);
642 }
643 goto write_hash;
644 }
645
646 /* well, we know, what the broadcast hash value is: it's xfd
647 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
648 set_bit(0xfd, bitmask);
649
22bedad3
JP		 650 netdev_for_each_mc_addr(ha, netdev) {
651 hash = spider_net_get_multicast_hash(netdev, ha->addr);
aaec0fab
JO		 652 set_bit(hash, bitmask);
653 }
654
655write_hash:
656 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
657 reg = 0;
658 if (test_bit(i * 4, bitmask))
659 reg += 0x08;
660 reg <<= 8;
661 if (test_bit(i * 4 + 1, bitmask))
662 reg += 0x08;
663 reg <<= 8;
664 if (test_bit(i * 4 + 2, bitmask))
665 reg += 0x08;
666 reg <<= 8;
667 if (test_bit(i * 4 + 3, bitmask))
668 reg += 0x08;
669
670 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
671 }
672}
673
aaec0fab
JO		 674/**
675 * spider_net_prepare_tx_descr - fill tx descriptor with skb data
676 * @card: card structure
aaec0fab
JO		 677 * @skb: packet to use
678 *
679 * returns 0 on success, <0 on failure.
680 *
681 * fills out the descriptor structure with skb data and len. Copies data,
682 * if needed (32bit DMA!)
683 */
684static int
685spider_net_prepare_tx_descr(struct spider_net_card *card,
aaec0fab
JO		 686 struct sk_buff *skb)
687{
d9c199ee 688 struct spider_net_descr_chain *chain = &card->tx_chain;
9cc7bf7e 689 struct spider_net_descr *descr;
4cb6f9e5 690 struct spider_net_hw_descr *hwdescr;
11f1a52b 691 dma_addr_t buf;
9cc7bf7e 692 unsigned long flags;
11f1a52b 693
9c434f5e 694 buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
8d8bb39b 695 if (pci_dma_mapping_error(card->pdev, buf)) {
11f1a52b 696 if (netif_msg_tx_err(card) && net_ratelimit())
e6311d85 697 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
9c434f5e 698 "Dropping packet\n", skb->data, skb->len);
9b6b0b81 699 card->spider_stats.tx_iommu_map_error++;
aaec0fab
JO		 700 return -ENOMEM;
701 }
702
d9c199ee 703 spin_lock_irqsave(&chain->lock, flags);
9cc7bf7e 704 descr = card->tx_chain.head;
d9c199ee
LV		 705 if (descr->next == chain->tail->prev) {
706 spin_unlock_irqrestore(&chain->lock, flags);
707 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE);
708 return -ENOMEM;
709 }
4cb6f9e5 710 hwdescr = descr->hwdescr;
d9c199ee 711 chain->head = descr->next;
9cc7bf7e 712
aaec0fab 713 descr->skb = skb;
4cb6f9e5
LV		 714 hwdescr->buf_addr = buf;
715 hwdescr->buf_size = skb->len;
716 hwdescr->next_descr_addr = 0;
717 hwdescr->data_status = 0;
aaec0fab 718
4cb6f9e5 719 hwdescr->dmac_cmd_status =
5f309b90 720 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
d9c199ee 721 spin_unlock_irqrestore(&chain->lock, flags);
9cc7bf7e 722
3a2c892d 723 if (skb->ip_summed == CHECKSUM_PARTIAL)
eddc9ec5 724 switch (ip_hdr(skb)->protocol) {
bdd01503 725 case IPPROTO_TCP:
4cb6f9e5 726 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
bdd01503
JO		 727 break;
728 case IPPROTO_UDP:
4cb6f9e5 729 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
bdd01503
JO		 730 break;
731 }
732
204e5fa1 733 /* Chain the bus address, so that the DMA engine finds this descr. */
4cb6f9e5
LV		 734 wmb();
735 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
bdd01503 736
917a5b8e 737 card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
bdd01503
JO		 738 return 0;
739}
740
a664ccf4 741static int
204e5fa1
LV		 742spider_net_set_low_watermark(struct spider_net_card *card)
743{
4cb6f9e5
LV		 744 struct spider_net_descr *descr = card->tx_chain.tail;
745 struct spider_net_hw_descr *hwdescr;
9cc7bf7e 746 unsigned long flags;
204e5fa1
LV		 747 int status;
748 int cnt=0;
749 int i;
204e5fa1 750
9cc7bf7e
LV		 751 /* Measure the length of the queue. Measurement does not
752 * need to be precise -- does not need a lock. */
204e5fa1 753 while (descr != card->tx_chain.head) {
4cb6f9e5 754 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
204e5fa1
LV		 755 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
756 break;
757 descr = descr->next;
758 cnt++;
759 }
760
761 /* If TX queue is short, don't even bother with interrupts */
d4ed8f8d 762 if (cnt < card->tx_chain.num_desc/4)
a664ccf4 763 return cnt;
204e5fa1
LV		 764
765 /* Set low-watermark 3/4th's of the way into the queue. */
766 descr = card->tx_chain.tail;
767 cnt = (cnt*3)/4;
768 for (i=0;i<cnt; i++)
769 descr = descr->next;
770
771 /* Set the new watermark, clear the old watermark */
9cc7bf7e 772 spin_lock_irqsave(&card->tx_chain.lock, flags);
4cb6f9e5
LV		 773 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
774 if (card->low_watermark && card->low_watermark != descr) {
775 hwdescr = card->low_watermark->hwdescr;
776 hwdescr->dmac_cmd_status =
777 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
778 }
204e5fa1 779 card->low_watermark = descr;
9cc7bf7e 780 spin_unlock_irqrestore(&card->tx_chain.lock, flags);
a664ccf4 781 return cnt;
204e5fa1
LV		 782}
783
bdd01503
JO		 784/**
785 * spider_net_release_tx_chain - processes sent tx descriptors
786 * @card: adapter structure
787 * @brutal: if set, don't care about whether descriptor seems to be in use
788 *
789 * returns 0 if the tx ring is empty, otherwise 1.
790 *
791 * spider_net_release_tx_chain releases the tx descriptors that spider has
792 * finished with (if non-brutal) or simply release tx descriptors (if brutal).
793 * If some other context is calling this function, we return 1 so that we're
26aca5ec 794 * scheduled again (if we were scheduled) and will not lose initiative.
bdd01503
JO		 795 */
796static int
797spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
798{
09f75cd7 799 struct net_device *dev = card->netdev;
bdd01503 800 struct spider_net_descr_chain *chain = &card->tx_chain;
9cc7bf7e 801 struct spider_net_descr *descr;
4cb6f9e5 802 struct spider_net_hw_descr *hwdescr;
9cc7bf7e
LV		 803 struct sk_buff *skb;
804 u32 buf_addr;
805 unsigned long flags;
bdd01503
JO		 806 int status;
807
5c8e98fe 808 while (1) {
9cc7bf7e 809 spin_lock_irqsave(&chain->lock, flags);
5c8e98fe
LV		 810 if (chain->tail == chain->head) {
811 spin_unlock_irqrestore(&chain->lock, flags);
812 return 0;
813 }
9cc7bf7e 814 descr = chain->tail;
4cb6f9e5 815 hwdescr = descr->hwdescr;
9cc7bf7e 816
4cb6f9e5 817 status = spider_net_get_descr_status(hwdescr);
bdd01503
JO		 818 switch (status) {
819 case SPIDER_NET_DESCR_COMPLETE:
09f75cd7
JG		 820 dev->stats.tx_packets++;
821 dev->stats.tx_bytes += descr->skb->len;
bdd01503
JO		 822 break;
823
824 case SPIDER_NET_DESCR_CARDOWNED:
9cc7bf7e
LV		 825 if (!brutal) {
826 spin_unlock_irqrestore(&chain->lock, flags);
bdd01503 827 return 1;
9cc7bf7e
LV		 828 }
829
bdd01503
JO		 830 /* fallthrough, if we release the descriptors
831 * brutally (then we don't care about
832 * SPIDER_NET_DESCR_CARDOWNED) */
833
834 case SPIDER_NET_DESCR_RESPONSE_ERROR:
835 case SPIDER_NET_DESCR_PROTECTION_ERROR:
836 case SPIDER_NET_DESCR_FORCE_END:
837 if (netif_msg_tx_err(card))
e6311d85
LV		 838 dev_err(&card->netdev->dev, "forcing end of tx descriptor "
839 "with status x%02x\n", status);
09f75cd7 840 dev->stats.tx_errors++;
bdd01503
JO		 841 break;
842
843 default:
09f75cd7 844 dev->stats.tx_dropped++;
9cc7bf7e
LV		 845 if (!brutal) {
846 spin_unlock_irqrestore(&chain->lock, flags);
c3fee4c5 847 return 1;
9cc7bf7e 848 }
bdd01503 849 }
aaec0fab 850
9cc7bf7e 851 chain->tail = descr->next;
4cb6f9e5 852 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
9cc7bf7e 853 skb = descr->skb;
d9c199ee 854 descr->skb = NULL;
4cb6f9e5 855 buf_addr = hwdescr->buf_addr;
9cc7bf7e
LV		 856 spin_unlock_irqrestore(&chain->lock, flags);
857
858 /* unmap the skb */
859 if (skb) {
9c434f5e
JL		 860 pci_unmap_single(card->pdev, buf_addr, skb->len,
861 PCI_DMA_TODEVICE);
9cc7bf7e
LV		 862 dev_kfree_skb(skb);
863 }
864 }
aaec0fab
JO		 865 return 0;
866}
867
868/**
869 * spider_net_kick_tx_dma - enables TX DMA processing
870 * @card: card structure
aaec0fab 871 *
a664ccf4
LV		 872 * This routine will start the transmit DMA running if
873 * it is not already running. This routine ned only be
874 * called when queueing a new packet to an empty tx queue.
875 * Writes the current tx chain head as start address
876 * of the tx descriptor chain and enables the transmission
877 * DMA engine.
aaec0fab 878 */
bdd01503
JO		 879static inline void
880spider_net_kick_tx_dma(struct spider_net_card *card)
aaec0fab 881{
bdd01503 882 struct spider_net_descr *descr;
aaec0fab 883
bdd01503
JO		 884 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
885 SPIDER_NET_TX_DMA_EN)
886 goto out;
aaec0fab 887
bdd01503
JO		 888 descr = card->tx_chain.tail;
889 for (;;) {
4cb6f9e5 890 if (spider_net_get_descr_status(descr->hwdescr) ==
bdd01503
JO		 891 SPIDER_NET_DESCR_CARDOWNED) {
892 spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
893 descr->bus_addr);
894 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
895 SPIDER_NET_DMA_TX_VALUE);
896 break;
897 }
898 if (descr == card->tx_chain.head)
899 break;
900 descr = descr->next;
901 }
902
903out:
904 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
aaec0fab
JO		 905}
906
907/**
908 * spider_net_xmit - transmits a frame over the device
909 * @skb: packet to send out
910 * @netdev: interface device structure
911 *
bdd01503 912 * returns 0 on success, !0 on failure
aaec0fab
JO		 913 */
914static int
915spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
916{
a664ccf4 917 int cnt;
aaec0fab 918 struct spider_net_card *card = netdev_priv(netdev);
bdd01503 919
11f1a52b 920 spider_net_release_tx_chain(card, 0);
aaec0fab 921
d9c199ee 922 if (spider_net_prepare_tx_descr(card, skb) != 0) {
09f75cd7 923 netdev->stats.tx_dropped++;
313ef4b7
LV		 924 netif_stop_queue(netdev);
925 return NETDEV_TX_BUSY;
bdd01503 926 }
aaec0fab 927
a664ccf4
LV		 928 cnt = spider_net_set_low_watermark(card);
929 if (cnt < 5)
930 spider_net_kick_tx_dma(card);
313ef4b7 931 return NETDEV_TX_OK;
bdd01503 932}
11f1a52b 933
bdd01503
JO		 934/**
935 * spider_net_cleanup_tx_ring - cleans up the TX ring
936 * @card: card structure
937 *
68a8c609
LV		 938 * spider_net_cleanup_tx_ring is called by either the tx_timer
939 * or from the NAPI polling routine.
940 * This routine releases resources associted with transmitted
941 * packets, including updating the queue tail pointer.
bdd01503
JO		 942 */
943static void
944spider_net_cleanup_tx_ring(struct spider_net_card *card)
945{
bdd01503 946 if ((spider_net_release_tx_chain(card, 0) != 0) &&
313ef4b7 947 (card->netdev->flags & IFF_UP)) {
bdd01503 948 spider_net_kick_tx_dma(card);
313ef4b7
LV		 949 netif_wake_queue(card->netdev);
950 }
aaec0fab
JO		 951}
952
953/**
954 * spider_net_do_ioctl - called for device ioctls
955 * @netdev: interface device structure
956 * @ifr: request parameter structure for ioctl
957 * @cmd: command code for ioctl
958 *
959 * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
960 * -EOPNOTSUPP is returned, if an unknown ioctl was requested
961 */
962static int
963spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
964{
965 switch (cmd) {
966 default:
967 return -EOPNOTSUPP;
968 }
969}
970
971/**
972 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
973 * @descr: descriptor to process
974 * @card: card structure
975 *
05b346b5
LV		 976 * Fills out skb structure and passes the data to the stack.
977 * The descriptor state is not changed.
aaec0fab 978 */
7f7223b8 979static void
aaec0fab 980spider_net_pass_skb_up(struct spider_net_descr *descr,
1cd173f6 981 struct spider_net_card *card)
aaec0fab 982{
09f75cd7
JG		 983 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
984 struct sk_buff *skb = descr->skb;
985 struct net_device *netdev = card->netdev;
986 u32 data_status = hwdescr->data_status;
987 u32 data_error = hwdescr->data_error;
aaec0fab 988
4cb6f9e5 989 skb_put(skb, hwdescr->valid_size);
aaec0fab
JO		 990
991 /* the card seems to add 2 bytes of junk in front
992 * of the ethernet frame */
993#define SPIDER_MISALIGN 2
994 skb_pull(skb, SPIDER_MISALIGN);
995 skb->protocol = eth_type_trans(skb, netdev);
996
997 /* checksum offload */
6de240b7
MM		 998 skb_checksum_none_assert(skb);
999 if (netdev->features & NETIF_F_RXCSUM) {
11f1a52b
AB		 1000 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
1001 SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
1002 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
aaec0fab 1003 skb->ip_summed = CHECKSUM_UNNECESSARY;
6de240b7 1004 }
aaec0fab
JO		 1005
1006 if (data_status & SPIDER_NET_VLAN_PACKET) {
9c5d0614 1007 /* further enhancements: HW-accel VLAN */
aaec0fab
JO		 1008 }
1009
aaec0fab 1010 /* update netdevice statistics */
09f75cd7
JG		 1011 netdev->stats.rx_packets++;
1012 netdev->stats.rx_bytes += skb->len;
93c1d3b7
FM		 1013
1014 /* pass skb up to stack */
1015 netif_receive_skb(skb);
aaec0fab
JO		 1016}
1017
6d24998f
LV		 1018static void show_rx_chain(struct spider_net_card *card)
1019{
1020 struct spider_net_descr_chain *chain = &card->rx_chain;
1021 struct spider_net_descr *start= chain->tail;
1022 struct spider_net_descr *descr= start;
9948357d
LV		 1023 struct spider_net_hw_descr *hwd = start->hwdescr;
1024 struct device *dev = &card->netdev->dev;
1025 u32 curr_desc, next_desc;
6d24998f
LV		 1026 int status;
1027
9948357d 1028 int tot = 0;
6d24998f 1029 int cnt = 0;
9948357d
LV		 1030 int off = start - chain->ring;
1031 int cstat = hwd->dmac_cmd_status;
1032
1033 dev_info(dev, "Total number of descrs=%d\n",
1034 chain->num_desc);
1035 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
1036 off, cstat);
1037
1038 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
1039 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
1040
6d24998f
LV		 1041 status = cstat;
1042 do
1043 {
9948357d
LV		 1044 hwd = descr->hwdescr;
1045 off = descr - chain->ring;
1046 status = hwd->dmac_cmd_status;
1047
1048 if (descr == chain->head)
1049 dev_info(dev, "Chain head is at %d, head status=0x%x\n",
1050 off, status);
1051
1052 if (curr_desc == descr->bus_addr)
1053 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
1054 off, status);
1055
1056 if (next_desc == descr->bus_addr)
1057 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
1058 off, status);
1059
1060 if (hwd->next_descr_addr == 0)
1061 dev_info(dev, "chain is cut at %d\n", off);
1062
6d24998f 1063 if (cstat != status) {
9948357d
LV		 1064 int from = (chain->num_desc + off - cnt) % chain->num_desc;
1065 int to = (chain->num_desc + off - 1) % chain->num_desc;
1066 dev_info(dev, "Have %d (from %d to %d) descrs "
1067 "with stat=0x%08x\n", cnt, from, to, cstat);
6d24998f
LV		 1068 cstat = status;
1069 cnt = 0;
1070 }
9948357d 1071
6d24998f 1072 cnt ++;
9948357d
LV		 1073 tot ++;
1074 descr = descr->next;
1075 } while (descr != start);
1076
1077 dev_info(dev, "Last %d descrs with stat=0x%08x "
1078 "for a total of %d descrs\n", cnt, cstat, tot);
1079
1080#ifdef DEBUG
1081 /* Now dump the whole ring */
1082 descr = start;
1083 do
1084 {
1085 struct spider_net_hw_descr *hwd = descr->hwdescr;
1086 status = spider_net_get_descr_status(hwd);
1087 cnt = descr - chain->ring;
1088 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
1089 cnt, status, descr->skb);
1090 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
1091 descr->bus_addr, hwd->buf_addr, hwd->buf_size);
1092 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
1093 hwd->next_descr_addr, hwd->result_size,
1094 hwd->valid_size);
1095 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
1096 hwd->dmac_cmd_status, hwd->data_status,
1097 hwd->data_error);
1098 dev_info(dev, "\n");
1099
6d24998f
LV		 1100 descr = descr->next;
1101 } while (descr != start);
6d24998f
LV		 1102#endif
1103
9948357d
LV		 1104}
1105
4c4bd5a9
LV		 1106/**
1107 * spider_net_resync_head_ptr - Advance head ptr past empty descrs
1108 *
1109 * If the driver fails to keep up and empty the queue, then the
1110 * hardware wil run out of room to put incoming packets. This
1111 * will cause the hardware to skip descrs that are full (instead
1112 * of halting/retrying). Thus, once the driver runs, it wil need
1113 * to "catch up" to where the hardware chain pointer is at.
1114 */
1115static void spider_net_resync_head_ptr(struct spider_net_card *card)
1116{
1117 unsigned long flags;
1118 struct spider_net_descr_chain *chain = &card->rx_chain;
1119 struct spider_net_descr *descr;
1120 int i, status;
1121
1122 /* Advance head pointer past any empty descrs */
1123 descr = chain->head;
1124 status = spider_net_get_descr_status(descr->hwdescr);
1125
1126 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
1127 return;
1128
1129 spin_lock_irqsave(&chain->lock, flags);
1130
1131 descr = chain->head;
1132 status = spider_net_get_descr_status(descr->hwdescr);
1133 for (i=0; i<chain->num_desc; i++) {
1134 if (status != SPIDER_NET_DESCR_CARDOWNED) break;
1135 descr = descr->next;
1136 status = spider_net_get_descr_status(descr->hwdescr);
1137 }
1138 chain->head = descr;
1139
1140 spin_unlock_irqrestore(&chain->lock, flags);
1141}
1142
1143static int spider_net_resync_tail_ptr(struct spider_net_card *card)
1144{
1145 struct spider_net_descr_chain *chain = &card->rx_chain;
1146 struct spider_net_descr *descr;
1147 int i, status;
1148
1149 /* Advance tail pointer past any empty and reaped descrs */
1150 descr = chain->tail;
1151 status = spider_net_get_descr_status(descr->hwdescr);
1152
1153 for (i=0; i<chain->num_desc; i++) {
1154 if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
1155 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
1156 descr = descr->next;
1157 status = spider_net_get_descr_status(descr->hwdescr);
1158 }
1159 chain->tail = descr;
1160
1161 if ((i == chain->num_desc) || (i == 0))
1162 return 1;
1163 return 0;
1164}
1165
aaec0fab 1166/**
7376e732 1167 * spider_net_decode_one_descr - processes an RX descriptor
aaec0fab
JO		 1168 * @card: card structure
1169 *
7376e732 1170 * Returns 1 if a packet has been sent to the stack, otherwise 0.
aaec0fab 1171 *
7376e732
LV		 1172 * Processes an RX descriptor by iommu-unmapping the data buffer
1173 * and passing the packet up to the stack. This function is called
1174 * in softirq context, e.g. either bottom half from interrupt or
1175 * NAPI polling context.
aaec0fab
JO		 1176 */
1177static int
1cd173f6 1178spider_net_decode_one_descr(struct spider_net_card *card)
aaec0fab 1179{
09f75cd7 1180 struct net_device *dev = card->netdev;
bdd01503
JO		 1181 struct spider_net_descr_chain *chain = &card->rx_chain;
1182 struct spider_net_descr *descr = chain->tail;
4cb6f9e5 1183 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
9e0a6e25 1184 u32 hw_buf_addr;
bdd01503 1185 int status;
aaec0fab 1186
4cb6f9e5 1187 status = spider_net_get_descr_status(hwdescr);
aaec0fab 1188
80dab7c7
LV		 1189 /* Nothing in the descriptor, or ring must be empty */
1190 if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
1191 (status == SPIDER_NET_DESCR_NOT_IN_USE))
1cd173f6 1192 return 0;
aaec0fab 1193
11f1a52b 1194 /* descriptor definitively used -- move on tail */
aaec0fab
JO		 1195 chain->tail = descr->next;
1196
05b346b5 1197 /* unmap descriptor */
9e0a6e25
LV		 1198 hw_buf_addr = hwdescr->buf_addr;
1199 hwdescr->buf_addr = 0xffffffff;
1200 pci_unmap_single(card->pdev, hw_buf_addr,
05b346b5
LV		 1201 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
1202
aaec0fab
JO		 1203 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
1204 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
1205 (status == SPIDER_NET_DESCR_FORCE_END) ) {
1206 if (netif_msg_rx_err(card))
09f75cd7 1207 dev_err(&dev->dev,
e6311d85 1208 "dropping RX descriptor with state %d\n", status);
09f75cd7 1209 dev->stats.rx_dropped++;
7f7223b8 1210 goto bad_desc;
aaec0fab
JO		 1211 }
1212
1213 if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
1214 (status != SPIDER_NET_DESCR_FRAME_END) ) {
5a028877 1215 if (netif_msg_rx_err(card))
e6311d85
LV		 1216 dev_err(&card->netdev->dev,
1217 "RX descriptor with unknown state %d\n", status);
5a028877 1218 card->spider_stats.rx_desc_unk_state++;
7f7223b8 1219 goto bad_desc;
aaec0fab
JO		 1220 }
1221
366684bd 1222 /* The cases we'll throw away the packet immediately */
4cb6f9e5 1223 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
366684bd 1224 if (netif_msg_rx_err(card))
e6311d85
LV		 1225 dev_err(&card->netdev->dev,
1226 "error in received descriptor found, "
366684bd 1227 "data_status=x%08x, data_error=x%08x\n",
4cb6f9e5 1228 hwdescr->data_status, hwdescr->data_error);
7f7223b8 1229 goto bad_desc;
366684bd
LV		 1230 }
1231
e65bbf13 1232 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
e6311d85 1233 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
4cb6f9e5 1234 hwdescr->dmac_cmd_status);
9e0a6e25 1235 pr_err("buf_addr=x%08x\n", hw_buf_addr);
4cb6f9e5
LV		 1236 pr_err("buf_size=x%08x\n", hwdescr->buf_size);
1237 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
1238 pr_err("result_size=x%08x\n", hwdescr->result_size);
1239 pr_err("valid_size=x%08x\n", hwdescr->valid_size);
1240 pr_err("data_status=x%08x\n", hwdescr->data_status);
1241 pr_err("data_error=x%08x\n", hwdescr->data_error);
6d24998f
LV		 1242 pr_err("which=%ld\n", descr - card->rx_chain.ring);
1243
1244 card->spider_stats.rx_desc_error++;
1245 goto bad_desc;
1246 }
1247
7f7223b8
LV		 1248 /* Ok, we've got a packet in descr */
1249 spider_net_pass_skb_up(descr, card);
83d35145 1250 descr->skb = NULL;
4cb6f9e5 1251 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
7f7223b8
LV		 1252 return 1;
1253
1254bad_desc:
9948357d
LV		 1255 if (netif_msg_rx_err(card))
1256 show_rx_chain(card);
7f7223b8 1257 dev_kfree_skb_irq(descr->skb);
d9c199ee 1258 descr->skb = NULL;
4cb6f9e5 1259 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
7f7223b8 1260 return 0;
aaec0fab
JO		 1261}
1262
1263/**
1264 * spider_net_poll - NAPI poll function called by the stack to return packets
1265 * @netdev: interface device structure
1266 * @budget: number of packets we can pass to the stack at most
1267 *
1268 * returns 0 if no more packets available to the driver/stack. Returns 1,
1269 * if the quota is exceeded, but the driver has still packets.
1270 *
1271 * spider_net_poll returns all packets from the rx descriptors to the stack
1272 * (using netif_receive_skb). If all/enough packets are up, the driver
1273 * reenables interrupts and returns 0. If not, 1 is returned.
1274 */
bea3348e 1275static int spider_net_poll(struct napi_struct *napi, int budget)
aaec0fab 1276{
bea3348e 1277 struct spider_net_card *card = container_of(napi, struct spider_net_card, napi);
bea3348e
SH		 1278 int packets_done = 0;
1279
1280 while (packets_done < budget) {
1281 if (!spider_net_decode_one_descr(card))
aaec0fab 1282 break;
bea3348e
SH		 1283
1284 packets_done++;
aaec0fab
JO		 1285 }
1286
4c4bd5a9 1287 if ((packets_done == 0) && (card->num_rx_ints != 0)) {
bea3348e
SH		 1288 if (!spider_net_resync_tail_ptr(card))
1289 packets_done = budget;
4c4bd5a9
LV		 1290 spider_net_resync_head_ptr(card);
1291 }
1292 card->num_rx_ints = 0;
1293
11f1a52b 1294 spider_net_refill_rx_chain(card);
80dab7c7 1295 spider_net_enable_rxdmac(card);
aaec0fab 1296
e1fd9070
LV		 1297 spider_net_cleanup_tx_ring(card);
1298
aaec0fab
JO		 1299 /* if all packets are in the stack, enable interrupts and return 0 */
1300 /* if not, return 1 */
bea3348e 1301 if (packets_done < budget) {
288379f0 1302 napi_complete(napi);
aaec0fab 1303 spider_net_rx_irq_on(card);
c3d1182a 1304 card->ignore_rx_ramfull = 0;
aaec0fab
JO		 1305 }
1306
bea3348e 1307 return packets_done;
aaec0fab
JO		 1308}
1309
aaec0fab
JO		 1310/**
1311 * spider_net_change_mtu - changes the MTU of an interface
1312 * @netdev: interface device structure
1313 * @new_mtu: new MTU value
1314 *
1315 * returns 0 on success, <0 on failure
1316 */
1317static int
1318spider_net_change_mtu(struct net_device *netdev, int new_mtu)
1319{
1320 /* no need to re-alloc skbs or so -- the max mtu is about 2.3k
1321 * and mtu is outbound only anyway */
1322 if ( (new_mtu < SPIDER_NET_MIN_MTU ) ||
1323 (new_mtu > SPIDER_NET_MAX_MTU) )
1324 return -EINVAL;
1325 netdev->mtu = new_mtu;
1326 return 0;
1327}
1328
1329/**
1330 * spider_net_set_mac - sets the MAC of an interface
1331 * @netdev: interface device structure
1332 * @ptr: pointer to new MAC address
1333 *
1334 * Returns 0 on success, <0 on failure. Currently, we don't support this
1335 * and will always return EOPNOTSUPP.
1336 */
1337static int
1338spider_net_set_mac(struct net_device *netdev, void *p)
1339{
1340 struct spider_net_card *card = netdev_priv(netdev);
054034db 1341 u32 macl, macu, regvalue;
aaec0fab
JO		 1342 struct sockaddr *addr = p;
1343
aaec0fab
JO		 1344 if (!is_valid_ether_addr(addr->sa_data))
1345 return -EADDRNOTAVAIL;
1346
054034db
JO		 1347 /* switch off GMACTPE and GMACRPE */
1348 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1349 regvalue &= ~((1 << 5) | (1 << 6));
1350 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1351
1352 /* write mac */
aaec0fab
JO		 1353 macu = (addr->sa_data[0]<<24) + (addr->sa_data[1]<<16) +
1354 (addr->sa_data[2]<<8) + (addr->sa_data[3]);
1355 macl = (addr->sa_data[4]<<8) + (addr->sa_data[5]);
1356 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
1357 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
1358
054034db
JO		 1359 /* switch GMACTPE and GMACRPE back on */
1360 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1361 regvalue |= ((1 << 5) | (1 << 6));
1362 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1363
aaec0fab
JO		 1364 spider_net_set_promisc(card);
1365
1366 /* look up, whether we have been successful */
1367 if (spider_net_get_mac_address(netdev))
1368 return -EADDRNOTAVAIL;
1369 if (memcmp(netdev->dev_addr,addr->sa_data,netdev->addr_len))
1370 return -EADDRNOTAVAIL;
1371
1372 return 0;
1373}
1374
abdb66b5
KI		 1375/**
1376 * spider_net_link_reset
1377 * @netdev: net device structure
1378 *
1379 * This is called when the PHY_LINK signal is asserted. For the blade this is
1380 * not connected so we should never get here.
1381 *
1382 */
1383static void
1384spider_net_link_reset(struct net_device *netdev)
1385{
1386
1387 struct spider_net_card *card = netdev_priv(netdev);
1388
1389 del_timer_sync(&card->aneg_timer);
1390
1391 /* clear interrupt, block further interrupts */
1392 spider_net_write_reg(card, SPIDER_NET_GMACST,
1393 spider_net_read_reg(card, SPIDER_NET_GMACST));
1394 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1395
1396 /* reset phy and setup aneg */
81971bef
IK		 1397 card->aneg_count = 0;
1398 card->medium = BCM54XX_COPPER;
abdb66b5
KI		 1399 spider_net_setup_aneg(card);
1400 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1401
1402}
1403
aaec0fab
JO		 1404/**
1405 * spider_net_handle_error_irq - handles errors raised by an interrupt
1406 * @card: card structure
1407 * @status_reg: interrupt status register 0 (GHIINT0STS)
1408 *
1409 * spider_net_handle_error_irq treats or ignores all error conditions
1410 * found when an interrupt is presented
1411 */
1412static void
9a11fcb5
IK		 1413spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg,
1414 u32 error_reg1, u32 error_reg2)
aaec0fab 1415{
aaec0fab
JO		 1416 u32 i;
1417 int show_error = 1;
1418
aaec0fab
JO		 1419 /* check GHIINT0STS ************************************/
1420 if (status_reg)
1421 for (i = 0; i < 32; i++)
1422 if (status_reg & (1<<i))
1423 switch (i)
1424 {
1425 /* let error_reg1 and error_reg2 evaluation decide, what to do
1426 case SPIDER_NET_PHYINT:
1427 case SPIDER_NET_GMAC2INT:
1428 case SPIDER_NET_GMAC1INT:
aaec0fab
JO		 1429 case SPIDER_NET_GFIFOINT:
1430 case SPIDER_NET_DMACINT:
1431 case SPIDER_NET_GSYSINT:
1432 break; */
1433
98b9040c
LV		 1434 case SPIDER_NET_GIPSINT:
1435 show_error = 0;
1436 break;
1437
aaec0fab
JO		 1438 case SPIDER_NET_GPWOPCMPINT:
1439 /* PHY write operation completed */
1440 show_error = 0;
1441 break;
1442 case SPIDER_NET_GPROPCMPINT:
1443 /* PHY read operation completed */
1444 /* we don't use semaphores, as we poll for the completion
1445 * of the read operation in spider_net_read_phy. Should take
1446 * about 50 us */
1447 show_error = 0;
1448 break;
1449 case SPIDER_NET_GPWFFINT:
1450 /* PHY command queue full */
1451 if (netif_msg_intr(card))
e6311d85 1452 dev_err(&card->netdev->dev, "PHY write queue full\n");
aaec0fab
JO		 1453 show_error = 0;
1454 break;
1455
1456 /* case SPIDER_NET_GRMDADRINT: not used. print a message */
1457 /* case SPIDER_NET_GRMARPINT: not used. print a message */
1458 /* case SPIDER_NET_GRMMPINT: not used. print a message */
1459
1460 case SPIDER_NET_GDTDEN0INT:
1461 /* someone has set TX_DMA_EN to 0 */
1462 show_error = 0;
1463 break;
1464
1465 case SPIDER_NET_GDDDEN0INT: /* fallthrough */
1466 case SPIDER_NET_GDCDEN0INT: /* fallthrough */
1467 case SPIDER_NET_GDBDEN0INT: /* fallthrough */
1468 case SPIDER_NET_GDADEN0INT:
1469 /* someone has set RX_DMA_EN to 0 */
1470 show_error = 0;
1471 break;
1472
1473 /* RX interrupts */
1474 case SPIDER_NET_GDDFDCINT:
1475 case SPIDER_NET_GDCFDCINT:
1476 case SPIDER_NET_GDBFDCINT:
1477 case SPIDER_NET_GDAFDCINT:
1478 /* case SPIDER_NET_GDNMINT: not used. print a message */
1479 /* case SPIDER_NET_GCNMINT: not used. print a message */
1480 /* case SPIDER_NET_GBNMINT: not used. print a message */
1481 /* case SPIDER_NET_GANMINT: not used. print a message */
1482 /* case SPIDER_NET_GRFNMINT: not used. print a message */
1483 show_error = 0;
1484 break;
1485
1486 /* TX interrupts */
1487 case SPIDER_NET_GDTFDCINT:
1488 show_error = 0;
1489 break;
1490 case SPIDER_NET_GTTEDINT:
1491 show_error = 0;
1492 break;
1493 case SPIDER_NET_GDTDCEINT:
1494 /* chain end. If a descriptor should be sent, kick off
1495 * tx dma
98b9040c 1496 if (card->tx_chain.tail != card->tx_chain.head)
aaec0fab 1497 spider_net_kick_tx_dma(card);
98b9040c
LV		 1498 */
1499 show_error = 0;
aaec0fab
JO		 1500 break;
1501
1502 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
1503 /* case SPIDER_NET_GFREECNTINT: not used. print a message */
1504 }
1505
1506 /* check GHIINT1STS ************************************/
1507 if (error_reg1)
1508 for (i = 0; i < 32; i++)
1509 if (error_reg1 & (1<<i))
1510 switch (i)
1511 {
1512 case SPIDER_NET_GTMFLLINT:
fc8e13da
IK		 1513 /* TX RAM full may happen on a usual case.
1514 * Logging is not needed. */
aaec0fab
JO		 1515 show_error = 0;
1516 break;
11f1a52b
AB		 1517 case SPIDER_NET_GRFDFLLINT: /* fallthrough */
1518 case SPIDER_NET_GRFCFLLINT: /* fallthrough */
1519 case SPIDER_NET_GRFBFLLINT: /* fallthrough */
1520 case SPIDER_NET_GRFAFLLINT: /* fallthrough */
aaec0fab 1521 case SPIDER_NET_GRMFLLINT:
4c4bd5a9 1522 /* Could happen when rx chain is full */
c3d1182a
LV		 1523 if (card->ignore_rx_ramfull == 0) {
1524 card->ignore_rx_ramfull = 1;
1525 spider_net_resync_head_ptr(card);
1526 spider_net_refill_rx_chain(card);
1527 spider_net_enable_rxdmac(card);
1528 card->num_rx_ints ++;
288379f0 1529 napi_schedule(&card->napi);
c3d1182a 1530 }
11f1a52b 1531 show_error = 0;
aaec0fab
JO		 1532 break;
1533
1534 /* case SPIDER_NET_GTMSHTINT: problem, print a message */
1535 case SPIDER_NET_GDTINVDINT:
1536 /* allrighty. tx from previous descr ok */
1537 show_error = 0;
1538 break;
aaec0fab
JO		 1539
1540 /* chain end */
1541 case SPIDER_NET_GDDDCEINT: /* fallthrough */
1542 case SPIDER_NET_GDCDCEINT: /* fallthrough */
1543 case SPIDER_NET_GDBDCEINT: /* fallthrough */
1544 case SPIDER_NET_GDADCEINT:
4c4bd5a9 1545 spider_net_resync_head_ptr(card);
aaec0fab 1546 spider_net_refill_rx_chain(card);
11f1a52b 1547 spider_net_enable_rxdmac(card);
4c4bd5a9 1548 card->num_rx_ints ++;
288379f0 1549 napi_schedule(&card->napi);
aaec0fab
JO		 1550 show_error = 0;
1551 break;
1552
1553 /* invalid descriptor */
1554 case SPIDER_NET_GDDINVDINT: /* fallthrough */
1555 case SPIDER_NET_GDCINVDINT: /* fallthrough */
1556 case SPIDER_NET_GDBINVDINT: /* fallthrough */
1557 case SPIDER_NET_GDAINVDINT:
4c4bd5a9
LV		 1558 /* Could happen when rx chain is full */
1559 spider_net_resync_head_ptr(card);
aaec0fab 1560 spider_net_refill_rx_chain(card);
11f1a52b 1561 spider_net_enable_rxdmac(card);
4c4bd5a9 1562 card->num_rx_ints ++;
288379f0 1563 napi_schedule(&card->napi);
aaec0fab
JO		 1564 show_error = 0;
1565 break;
1566
1567 /* case SPIDER_NET_GDTRSERINT: problem, print a message */
1568 /* case SPIDER_NET_GDDRSERINT: problem, print a message */
1569 /* case SPIDER_NET_GDCRSERINT: problem, print a message */
1570 /* case SPIDER_NET_GDBRSERINT: problem, print a message */
1571 /* case SPIDER_NET_GDARSERINT: problem, print a message */
1572 /* case SPIDER_NET_GDSERINT: problem, print a message */
1573 /* case SPIDER_NET_GDTPTERINT: problem, print a message */
1574 /* case SPIDER_NET_GDDPTERINT: problem, print a message */
1575 /* case SPIDER_NET_GDCPTERINT: problem, print a message */
1576 /* case SPIDER_NET_GDBPTERINT: problem, print a message */
1577 /* case SPIDER_NET_GDAPTERINT: problem, print a message */
1578 default:
1579 show_error = 1;
1580 break;
1581 }
1582
1583 /* check GHIINT2STS ************************************/
1584 if (error_reg2)
1585 for (i = 0; i < 32; i++)
1586 if (error_reg2 & (1<<i))
1587 switch (i)
1588 {
1589 /* there is nothing we can (want to) do at this time. Log a
1590 * message, we can switch on and off the specific values later on
1591 case SPIDER_NET_GPROPERINT:
1592 case SPIDER_NET_GMCTCRSNGINT:
1593 case SPIDER_NET_GMCTLCOLINT:
1594 case SPIDER_NET_GMCTTMOTINT:
1595 case SPIDER_NET_GMCRCAERINT:
1596 case SPIDER_NET_GMCRCALERINT:
1597 case SPIDER_NET_GMCRALNERINT:
1598 case SPIDER_NET_GMCROVRINT:
1599 case SPIDER_NET_GMCRRNTINT:
1600 case SPIDER_NET_GMCRRXERINT:
1601 case SPIDER_NET_GTITCSERINT:
1602 case SPIDER_NET_GTIFMTERINT:
1603 case SPIDER_NET_GTIPKTRVKINT:
1604 case SPIDER_NET_GTISPINGINT:
1605 case SPIDER_NET_GTISADNGINT:
1606 case SPIDER_NET_GTISPDNGINT:
1607 case SPIDER_NET_GRIFMTERINT:
1608 case SPIDER_NET_GRIPKTRVKINT:
1609 case SPIDER_NET_GRISPINGINT:
1610 case SPIDER_NET_GRISADNGINT:
1611 case SPIDER_NET_GRISPDNGINT:
1612 break;
1613 */
1614 default:
1615 break;
1616 }
1617
5a028877 1618 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
e6311d85 1619 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
aaec0fab
JO		 1620 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1621 status_reg, error_reg1, error_reg2);
1622
1623 /* clear interrupt sources */
1624 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
1625 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
1626}
1627
1628/**
1629 * spider_net_interrupt - interrupt handler for spider_net
3a4fa0a2 1630 * @irq: interrupt number
aaec0fab 1631 * @ptr: pointer to net_device
aaec0fab
JO		 1632 *
1633 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
1634 * interrupt found raised by card.
1635 *
1636 * This is the interrupt handler, that turns off
1637 * interrupts for this device and makes the stack poll the driver
1638 */
1639static irqreturn_t
7d12e780 1640spider_net_interrupt(int irq, void *ptr)
aaec0fab
JO		 1641{
1642 struct net_device *netdev = ptr;
1643 struct spider_net_card *card = netdev_priv(netdev);
9a11fcb5 1644 u32 status_reg, error_reg1, error_reg2;
aaec0fab
JO		 1645
1646 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
9a11fcb5
IK		 1647 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
1648 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
aaec0fab 1649
9a11fcb5
IK		 1650 if (!(status_reg & SPIDER_NET_INT0_MASK_VALUE) &&
1651 !(error_reg1 & SPIDER_NET_INT1_MASK_VALUE) &&
1652 !(error_reg2 & SPIDER_NET_INT2_MASK_VALUE))
aaec0fab
JO		 1653 return IRQ_NONE;
1654
aaec0fab
JO		 1655 if (status_reg & SPIDER_NET_RXINT ) {
1656 spider_net_rx_irq_off(card);
288379f0 1657 napi_schedule(&card->napi);
4c4bd5a9 1658 card->num_rx_ints ++;
aaec0fab 1659 }
68a8c609 1660 if (status_reg & SPIDER_NET_TXINT)
288379f0 1661 napi_schedule(&card->napi);
aaec0fab 1662
abdb66b5
KI		 1663 if (status_reg & SPIDER_NET_LINKINT)
1664 spider_net_link_reset(netdev);
1665
11f1a52b 1666 if (status_reg & SPIDER_NET_ERRINT )
9a11fcb5
IK		 1667 spider_net_handle_error_irq(card, status_reg,
1668 error_reg1, error_reg2);
aaec0fab
JO		 1669
1670 /* clear interrupt sources */
1671 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
1672
1673 return IRQ_HANDLED;
1674}
1675
1676#ifdef CONFIG_NET_POLL_CONTROLLER
1677/**
1678 * spider_net_poll_controller - artificial interrupt for netconsole etc.
1679 * @netdev: interface device structure
1680 *
1681 * see Documentation/networking/netconsole.txt
1682 */
1683static void
1684spider_net_poll_controller(struct net_device *netdev)
1685{
1686 disable_irq(netdev->irq);
7d12e780 1687 spider_net_interrupt(netdev->irq, netdev);
aaec0fab
JO		 1688 enable_irq(netdev->irq);
1689}
1690#endif /* CONFIG_NET_POLL_CONTROLLER */
1691
7a627558
IK		 1692/**
1693 * spider_net_enable_interrupts - enable interrupts
1694 * @card: card structure
1695 *
1696 * spider_net_enable_interrupt enables several interrupts
1697 */
7d2e3cb7 1698static void
7a627558
IK		 1699spider_net_enable_interrupts(struct spider_net_card *card)
1700{
1701 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
1702 SPIDER_NET_INT0_MASK_VALUE);
1703 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
1704 SPIDER_NET_INT1_MASK_VALUE);
1705 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
1706 SPIDER_NET_INT2_MASK_VALUE);
1707}
1708
1709/**
1710 * spider_net_disable_interrupts - disable interrupts
1711 * @card: card structure
1712 *
1713 * spider_net_disable_interrupts disables all the interrupts
1714 */
7d2e3cb7 1715static void
7a627558
IK		 1716spider_net_disable_interrupts(struct spider_net_card *card)
1717{
1718 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
1719 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
1720 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
1721 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1722}
1723
aaec0fab
JO		 1724/**
1725 * spider_net_init_card - initializes the card
1726 * @card: card structure
1727 *
1728 * spider_net_init_card initializes the card so that other registers can
1729 * be used
1730 */
1731static void
1732spider_net_init_card(struct spider_net_card *card)
1733{
1734 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1735 SPIDER_NET_CKRCTRL_STOP_VALUE);
1736
1737 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1738 SPIDER_NET_CKRCTRL_RUN_VALUE);
3342cf0e
KI		 1739
1740 /* trigger ETOMOD signal */
1741 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1742 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
1743
7a627558 1744 spider_net_disable_interrupts(card);
aaec0fab
JO		 1745}
1746
1747/**
1748 * spider_net_enable_card - enables the card by setting all kinds of regs
1749 * @card: card structure
1750 *
1751 * spider_net_enable_card sets a lot of SMMIO registers to enable the device
1752 */
1753static void
1754spider_net_enable_card(struct spider_net_card *card)
1755{
1756 int i;
1757 /* the following array consists of (register),(value) pairs
1758 * that are set in this function. A register of 0 ends the list */
1759 u32 regs[][2] = {
1760 { SPIDER_NET_GRESUMINTNUM, 0 },
1761 { SPIDER_NET_GREINTNUM, 0 },
1762
1763 /* set interrupt frame number registers */
1764 /* clear the single DMA engine registers first */
1765 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1766 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1767 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1768 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1769 /* then set, what we really need */
1770 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
1771
1772 /* timer counter registers and stuff */
1773 { SPIDER_NET_GFREECNNUM, 0 },
1774 { SPIDER_NET_GONETIMENUM, 0 },
1775 { SPIDER_NET_GTOUTFRMNUM, 0 },
1776
1777 /* RX mode setting */
1778 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
1779 /* TX mode setting */
1780 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
1781 /* IPSEC mode setting */
1782 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
1783
1784 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
1785
1786 { SPIDER_NET_GMRWOLCTRL, 0 },
b636d17a
JO		 1787 { SPIDER_NET_GTESTMD, 0x10000000 },
1788 { SPIDER_NET_GTTQMSK, 0x00400040 },
aaec0fab
JO		 1789
1790 { SPIDER_NET_GMACINTEN, 0 },
1791
1792 /* flow control stuff */
1793 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
1794 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
1795
1796 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
1797 { 0, 0}
1798 };
1799
1800 i = 0;
1801 while (regs[i][0]) {
1802 spider_net_write_reg(card, regs[i][0], regs[i][1]);
1803 i++;
1804 }
1805
1806 /* clear unicast filter table entries 1 to 14 */
1807 for (i = 1; i <= 14; i++) {
1808 spider_net_write_reg(card,
1809 SPIDER_NET_GMRUAFILnR + i * 8,
1810 0x00080000);
1811 spider_net_write_reg(card,
1812 SPIDER_NET_GMRUAFILnR + i * 8 + 4,
1813 0x00000000);
1814 }
1815
1816 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
1817
1818 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
1819
3ad2f3fb 1820 /* set chain tail address for RX chains and
aaec0fab
JO		 1821 * enable DMA */
1822 spider_net_enable_rxchtails(card);
1823 spider_net_enable_rxdmac(card);
1824
1825 spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
1826
aaec0fab
JO		 1827 spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
1828 SPIDER_NET_LENLMT_VALUE);
aaec0fab
JO		 1829 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1830 SPIDER_NET_OPMODE_VALUE);
1831
bdd01503 1832 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
7bd54c86 1833 SPIDER_NET_GDTBSTA);
aaec0fab
JO		 1834}
1835
3cf761dd
KI		 1836/**
1837 * spider_net_download_firmware - loads firmware into the adapter
1838 * @card: card structure
1839 * @firmware_ptr: pointer to firmware data
1840 *
1841 * spider_net_download_firmware loads the firmware data into the
1842 * adapter. It assumes the length etc. to be allright.
1843 */
1844static int
1845spider_net_download_firmware(struct spider_net_card *card,
1846 const void *firmware_ptr)
1847{
1848 int sequencer, i;
1849 const u32 *fw_ptr = firmware_ptr;
1850
1851 /* stop sequencers */
1852 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1853 SPIDER_NET_STOP_SEQ_VALUE);
1854
1855 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
1856 sequencer++) {
1857 spider_net_write_reg(card,
1858 SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
1859 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1860 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
1861 sequencer * 8, *fw_ptr);
1862 fw_ptr++;
1863 }
1864 }
1865
1866 if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
1867 return -EIO;
1868
1869 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1870 SPIDER_NET_RUN_SEQ_VALUE);
1871
1872 return 0;
1873}
1874
1875/**
1876 * spider_net_init_firmware - reads in firmware parts
1877 * @card: card structure
1878 *
1879 * Returns 0 on success, <0 on failure
1880 *
1881 * spider_net_init_firmware opens the sequencer firmware and does some basic
1882 * checks. This function opens and releases the firmware structure. A call
1883 * to download the firmware is performed before the release.
1884 *
1885 * Firmware format
1886 * ===============
1887 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
1888 * the program for each sequencer. Use the command
1889 * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \
1890 * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \
1891 * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
1892 *
1893 * to generate spider_fw.bin, if you have sequencer programs with something
1894 * like the following contents for each sequencer:
1895 * <ONE LINE COMMENT>
1896 * <FIRST 4-BYTES-WORD FOR SEQUENCER>
1897 * <SECOND 4-BYTES-WORD FOR SEQUENCER>
1898 * ...
1899 * <1024th 4-BYTES-WORD FOR SEQUENCER>
1900 */
1901static int
1902spider_net_init_firmware(struct spider_net_card *card)
1903{
1904 struct firmware *firmware = NULL;
1905 struct device_node *dn;
1906 const u8 *fw_prop = NULL;
1907 int err = -ENOENT;
1908 int fw_size;
1909
1910 if (request_firmware((const struct firmware **)&firmware,
1911 SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
1912 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
1913 netif_msg_probe(card) ) {
e6311d85
LV		 1914 dev_err(&card->netdev->dev,
1915 "Incorrect size of spidernet firmware in " \
3cf761dd
KI		 1916 "filesystem. Looking in host firmware...\n");
1917 goto try_host_fw;
1918 }
1919 err = spider_net_download_firmware(card, firmware->data);
1920
1921 release_firmware(firmware);
1922 if (err)
1923 goto try_host_fw;
1924
1925 goto done;
1926 }
1927
1928try_host_fw:
1929 dn = pci_device_to_OF_node(card->pdev);
1930 if (!dn)
1931 goto out_err;
1932
40cd3a45 1933 fw_prop = of_get_property(dn, "firmware", &fw_size);
3cf761dd
KI		 1934 if (!fw_prop)
1935 goto out_err;
1936
1937 if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
1938 netif_msg_probe(card) ) {
e6311d85
LV		 1939 dev_err(&card->netdev->dev,
1940 "Incorrect size of spidernet firmware in host firmware\n");
3cf761dd
KI		 1941 goto done;
1942 }
1943
1944 err = spider_net_download_firmware(card, fw_prop);
1945
1946done:
1947 return err;
1948out_err:
1949 if (netif_msg_probe(card))
e6311d85
LV		 1950 dev_err(&card->netdev->dev,
1951 "Couldn't find spidernet firmware in filesystem " \
3cf761dd
KI		 1952 "or host firmware\n");
1953 return err;
1954}
1955
aaec0fab
JO		 1956/**
1957 * spider_net_open - called upon ifonfig up
1958 * @netdev: interface device structure
1959 *
1960 * returns 0 on success, <0 on failure
1961 *
1962 * spider_net_open allocates all the descriptors and memory needed for
1963 * operation, sets up multicast list and enables interrupts
1964 */
1965int
1966spider_net_open(struct net_device *netdev)
1967{
1968 struct spider_net_card *card = netdev_priv(netdev);
d4ed8f8d 1969 int result;
aaec0fab 1970
3cf761dd
KI		 1971 result = spider_net_init_firmware(card);
1972 if (result)
1973 goto init_firmware_failed;
1974
abdb66b5 1975 /* start probing with copper */
81971bef
IK		 1976 card->aneg_count = 0;
1977 card->medium = BCM54XX_COPPER;
abdb66b5
KI		 1978 spider_net_setup_aneg(card);
1979 if (card->phy.def->phy_id)
1980 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1981
d4ed8f8d
LV		 1982 result = spider_net_init_chain(card, &card->tx_chain);
1983 if (result)
aaec0fab 1984 goto alloc_tx_failed;
204e5fa1
LV		 1985 card->low_watermark = NULL;
1986
d4ed8f8d
LV		 1987 result = spider_net_init_chain(card, &card->rx_chain);
1988 if (result)
aaec0fab
JO		 1989 goto alloc_rx_failed;
1990
d4ed8f8d 1991 /* Allocate rx skbs */
aaec0fab
JO		 1992 if (spider_net_alloc_rx_skbs(card))
1993 goto alloc_skbs_failed;
1994
1995 spider_net_set_multi(netdev);
1996
1997 /* further enhancement: setup hw vlan, if needed */
1998
1999 result = -EBUSY;
2000 if (request_irq(netdev->irq, spider_net_interrupt,
1fb9df5d 2001 IRQF_SHARED, netdev->name, netdev))
aaec0fab
JO		 2002 goto register_int_failed;
2003
2004 spider_net_enable_card(card);
2005
543cec51
JO		 2006 netif_start_queue(netdev);
2007 netif_carrier_on(netdev);
bea3348e 2008 napi_enable(&card->napi);
543cec51 2009
7a627558
IK		 2010 spider_net_enable_interrupts(card);
2011
aaec0fab
JO		 2012 return 0;
2013
2014register_int_failed:
2015 spider_net_free_rx_chain_contents(card);
2016alloc_skbs_failed:
2017 spider_net_free_chain(card, &card->rx_chain);
2018alloc_rx_failed:
2019 spider_net_free_chain(card, &card->tx_chain);
2020alloc_tx_failed:
abdb66b5 2021 del_timer_sync(&card->aneg_timer);
3cf761dd 2022init_firmware_failed:
aaec0fab
JO		 2023 return result;
2024}
2025
abdb66b5
KI		 2026/**
2027 * spider_net_link_phy
2028 * @data: used for pointer to card structure
2029 *
2030 */
2031static void spider_net_link_phy(unsigned long data)
2032{
2033 struct spider_net_card *card = (struct spider_net_card *)data;
2034 struct mii_phy *phy = &card->phy;
2035
2036 /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
2037 if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
2038
0b50d753
IK		 2039 pr_debug("%s: link is down trying to bring it up\n",
2040 card->netdev->name);
abdb66b5 2041
4b23a554
JO		 2042 switch (card->medium) {
2043 case BCM54XX_COPPER:
abdb66b5
KI		 2044 /* enable fiber with autonegotiation first */
2045 if (phy->def->ops->enable_fiber)
2046 phy->def->ops->enable_fiber(phy, 1);
4b23a554 2047 card->medium = BCM54XX_FIBER;
abdb66b5
KI		 2048 break;
2049
4b23a554 2050 case BCM54XX_FIBER:
abdb66b5
KI		 2051 /* fiber didn't come up, try to disable fiber autoneg */
2052 if (phy->def->ops->enable_fiber)
2053 phy->def->ops->enable_fiber(phy, 0);
4b23a554 2054 card->medium = BCM54XX_UNKNOWN;
abdb66b5
KI		 2055 break;
2056
4b23a554 2057 case BCM54XX_UNKNOWN:
abdb66b5
KI		 2058 /* copper, fiber with and without failed,
2059 * retry from beginning */
2060 spider_net_setup_aneg(card);
4b23a554 2061 card->medium = BCM54XX_COPPER;
abdb66b5
KI		 2062 break;
2063 }
2064
2065 card->aneg_count = 0;
2066 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2067 return;
2068 }
2069
2070 /* link still not up, try again later */
2071 if (!(phy->def->ops->poll_link(phy))) {
2072 card->aneg_count++;
2073 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2074 return;
2075 }
2076
2077 /* link came up, get abilities */
2078 phy->def->ops->read_link(phy);
2079
2080 spider_net_write_reg(card, SPIDER_NET_GMACST,
2081 spider_net_read_reg(card, SPIDER_NET_GMACST));
2082 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
2083
2084 if (phy->speed == 1000)
2085 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
2086 else
2087 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
2088
2089 card->aneg_count = 0;
2090
0b50d753
IK		 2091 pr_info("%s: link up, %i Mbps, %s-duplex %sautoneg.\n",
2092 card->netdev->name, phy->speed,
2093 phy->duplex == 1 ? "Full" : "Half",
2094 phy->autoneg == 1 ? "" : "no ");
abdb66b5
KI		 2095}
2096
aaec0fab
JO		 2097/**
2098 * spider_net_setup_phy - setup PHY
2099 * @card: card structure
2100 *
2101 * returns 0 on success, <0 on failure
2102 *
abdb66b5 2103 * spider_net_setup_phy is used as part of spider_net_probe.
aaec0fab
JO		 2104 **/
2105static int
2106spider_net_setup_phy(struct spider_net_card *card)
2107{
2108 struct mii_phy *phy = &card->phy;
2109
2110 spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
2111 SPIDER_NET_DMASEL_VALUE);
2112 spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
2113 SPIDER_NET_PHY_CTRL_VALUE);
abdb66b5 2114
aaec0fab
JO		 2115 phy->dev = card->netdev;
2116 phy->mdio_read = spider_net_read_phy;
2117 phy->mdio_write = spider_net_write_phy;
2118
abdb66b5
KI		 2119 for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
2120 unsigned short id;
2121 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
2122 if (id != 0x0000 && id != 0xffff) {
2123 if (!mii_phy_probe(phy, phy->mii_id)) {
2124 pr_info("Found %s.\n", phy->def->name);
2125 break;
2126 }
2127 }
2128 }
aaec0fab
JO		 2129
2130 return 0;
2131}
2132
aaec0fab
JO		 2133/**
2134 * spider_net_workaround_rxramfull - work around firmware bug
2135 * @card: card structure
2136 *
2137 * no return value
2138 **/
2139static void
2140spider_net_workaround_rxramfull(struct spider_net_card *card)
2141{
2142 int i, sequencer = 0;
2143
2144 /* cancel reset */
2145 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2146 SPIDER_NET_CKRCTRL_RUN_VALUE);
2147
2148 /* empty sequencer data */
11f1a52b
AB		 2149 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
2150 sequencer++) {
ee962a5c 2151 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
aaec0fab 2152 sequencer * 8, 0x0);
11f1a52b 2153 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
aaec0fab
JO		 2154 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
2155 sequencer * 8, 0x0);
2156 }
2157 }
2158
2159 /* set sequencer operation */
2160 spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
2161
2162 /* reset */
2163 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2164 SPIDER_NET_CKRCTRL_STOP_VALUE);
2165}
2166
bdd01503
JO		 2167/**
2168 * spider_net_stop - called upon ifconfig down
2169 * @netdev: interface device structure
2170 *
2171 * always returns 0
2172 */
2173int
2174spider_net_stop(struct net_device *netdev)
2175{
2176 struct spider_net_card *card = netdev_priv(netdev);
2177
bea3348e 2178 napi_disable(&card->napi);
bdd01503
JO		 2179 netif_carrier_off(netdev);
2180 netif_stop_queue(netdev);
2181 del_timer_sync(&card->tx_timer);
abdb66b5 2182 del_timer_sync(&card->aneg_timer);
bdd01503 2183
7a627558 2184 spider_net_disable_interrupts(card);
bdd01503 2185
d406eafe 2186 free_irq(netdev->irq, netdev);
bdd01503
JO		 2187
2188 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
2189 SPIDER_NET_DMA_TX_FEND_VALUE);
2190
2191 /* turn off DMA, force end */
2192 spider_net_disable_rxdmac(card);
2193
2194 /* release chains */
9cc7bf7e 2195 spider_net_release_tx_chain(card, 1);
d4ed8f8d 2196 spider_net_free_rx_chain_contents(card);
bdd01503
JO		 2197
2198 spider_net_free_chain(card, &card->tx_chain);
2199 spider_net_free_chain(card, &card->rx_chain);
2200
2201 return 0;
2202}
2203
aaec0fab
JO		 2204/**
2205 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
2206 * function (to be called not under interrupt status)
2207 * @data: data, is interface device structure
2208 *
2209 * called as task when tx hangs, resets interface (if interface is up)
2210 */
2211static void
c4028958 2212spider_net_tx_timeout_task(struct work_struct *work)
aaec0fab 2213{
c4028958
DH		 2214 struct spider_net_card *card =
2215 container_of(work, struct spider_net_card, tx_timeout_task);
2216 struct net_device *netdev = card->netdev;
aaec0fab
JO		 2217
2218 if (!(netdev->flags & IFF_UP))
2219 goto out;
2220
2221 netif_device_detach(netdev);
2222 spider_net_stop(netdev);
2223
2224 spider_net_workaround_rxramfull(card);
2225 spider_net_init_card(card);
2226
2227 if (spider_net_setup_phy(card))
2228 goto out;
aaec0fab
JO		 2229
2230 spider_net_open(netdev);
bdd01503 2231 spider_net_kick_tx_dma(card);
aaec0fab
JO		 2232 netif_device_attach(netdev);
2233
2234out:
2235 atomic_dec(&card->tx_timeout_task_counter);
2236}
2237
2238/**
2239 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
2240 * @netdev: interface device structure
2241 *
2242 * called, if tx hangs. Schedules a task that resets the interface
2243 */
2244static void
2245spider_net_tx_timeout(struct net_device *netdev)
2246{
2247 struct spider_net_card *card;
2248
2249 card = netdev_priv(netdev);
2250 atomic_inc(&card->tx_timeout_task_counter);
2251 if (netdev->flags & IFF_UP)
2252 schedule_work(&card->tx_timeout_task);
2253 else
2254 atomic_dec(&card->tx_timeout_task_counter);
9b6b0b81 2255 card->spider_stats.tx_timeouts++;
aaec0fab
JO		 2256}
2257
6e06cb62 2258static const struct net_device_ops spider_net_ops = {
da4a99e3
DM		 2259 .ndo_open = spider_net_open,
2260 .ndo_stop = spider_net_stop,
2261 .ndo_start_xmit = spider_net_xmit,
2262 .ndo_set_multicast_list = spider_net_set_multi,
2263 .ndo_set_mac_address = spider_net_set_mac,
2264 .ndo_change_mtu = spider_net_change_mtu,
2265 .ndo_do_ioctl = spider_net_do_ioctl,
2266 .ndo_tx_timeout = spider_net_tx_timeout,
3e303dc1 2267 .ndo_validate_addr = eth_validate_addr,
6e06cb62
YH		 2268 /* HW VLAN */
2269#ifdef CONFIG_NET_POLL_CONTROLLER
2270 /* poll controller */
da4a99e3 2271 .ndo_poll_controller = spider_net_poll_controller,
6e06cb62
YH		 2272#endif /* CONFIG_NET_POLL_CONTROLLER */
2273};
2274
aaec0fab
JO		 2275/**
2276 * spider_net_setup_netdev_ops - initialization of net_device operations
2277 * @netdev: net_device structure
2278 *
2279 * fills out function pointers in the net_device structure
2280 */
2281static void
2282spider_net_setup_netdev_ops(struct net_device *netdev)
2283{
6e06cb62 2284 netdev->netdev_ops = &spider_net_ops;
aaec0fab 2285 netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
aaec0fab
JO		 2286 /* ethtool ops */
2287 netdev->ethtool_ops = &spider_net_ethtool_ops;
2288}
2289
2290/**
2291 * spider_net_setup_netdev - initialization of net_device
2292 * @card: card structure
2293 *
2294 * Returns 0 on success or <0 on failure
2295 *
2296 * spider_net_setup_netdev initializes the net_device structure
2297 **/
2298static int
2299spider_net_setup_netdev(struct spider_net_card *card)
2300{
2301 int result;
2302 struct net_device *netdev = card->netdev;
2303 struct device_node *dn;
2304 struct sockaddr addr;
1a2509c9 2305 const u8 *mac;
aaec0fab 2306
aaec0fab
JO		 2307 SET_NETDEV_DEV(netdev, &card->pdev->dev);
2308
2309 pci_set_drvdata(card->pdev, netdev);
11f1a52b 2310
11f1a52b
AB		 2311 init_timer(&card->tx_timer);
2312 card->tx_timer.function =
2313 (void (*)(unsigned long)) spider_net_cleanup_tx_ring;
2314 card->tx_timer.data = (unsigned long) card;
aaec0fab
JO		 2315 netdev->irq = card->pdev->irq;
2316
abdb66b5
KI		 2317 card->aneg_count = 0;
2318 init_timer(&card->aneg_timer);
2319 card->aneg_timer.function = spider_net_link_phy;
2320 card->aneg_timer.data = (unsigned long) card;
2321
bea3348e
SH		 2322 netif_napi_add(netdev, &card->napi,
2323 spider_net_poll, SPIDER_NET_NAPI_WEIGHT);
2324
aaec0fab
JO		 2325 spider_net_setup_netdev_ops(netdev);
2326
6de240b7
MM		 2327 netdev->hw_features = NETIF_F_RXCSUM | NETIF_F_IP_CSUM;
2328 if (SPIDER_NET_RX_CSUM_DEFAULT)
2329 netdev->features |= NETIF_F_RXCSUM;
2330 netdev->features |= NETIF_F_IP_CSUM | NETIF_F_LLTX;
aaec0fab
JO		 2331 /* some time: NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
2332 * NETIF_F_HW_VLAN_FILTER */
2333
2334 netdev->irq = card->pdev->irq;
4c4bd5a9 2335 card->num_rx_ints = 0;
c3d1182a 2336 card->ignore_rx_ramfull = 0;
aaec0fab
JO		 2337
2338 dn = pci_device_to_OF_node(card->pdev);
543cec51
JO		 2339 if (!dn)
2340 return -EIO;
2341
40cd3a45 2342 mac = of_get_property(dn, "local-mac-address", NULL);
543cec51
JO		 2343 if (!mac)
2344 return -EIO;
aaec0fab
JO		 2345 memcpy(addr.sa_data, mac, ETH_ALEN);
2346
2347 result = spider_net_set_mac(netdev, &addr);
2348 if ((result) && (netif_msg_probe(card)))
e6311d85
LV		 2349 dev_err(&card->netdev->dev,
2350 "Failed to set MAC address: %i\n", result);
aaec0fab
JO		 2351
2352 result = register_netdev(netdev);
2353 if (result) {
2354 if (netif_msg_probe(card))
e6311d85
LV		 2355 dev_err(&card->netdev->dev,
2356 "Couldn't register net_device: %i\n", result);
aaec0fab
JO		 2357 return result;
2358 }
2359
2360 if (netif_msg_probe(card))
2361 pr_info("Initialized device %s.\n", netdev->name);
2362
2363 return 0;
2364}
2365
2366/**
2367 * spider_net_alloc_card - allocates net_device and card structure
2368 *
2369 * returns the card structure or NULL in case of errors
2370 *
2371 * the card and net_device structures are linked to each other
2372 */
2373static struct spider_net_card *
2374spider_net_alloc_card(void)
2375{
2376 struct net_device *netdev;
2377 struct spider_net_card *card;
4cb6f9e5 2378 size_t alloc_size;
aaec0fab 2379
4cb6f9e5
LV		 2380 alloc_size = sizeof(struct spider_net_card) +
2381 (tx_descriptors + rx_descriptors) * sizeof(struct spider_net_descr);
2382 netdev = alloc_etherdev(alloc_size);
aaec0fab
JO		 2383 if (!netdev)
2384 return NULL;
2385
2386 card = netdev_priv(netdev);
2387 card->netdev = netdev;
2388 card->msg_enable = SPIDER_NET_DEFAULT_MSG;
c4028958 2389 INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
aaec0fab
JO		 2390 init_waitqueue_head(&card->waitq);
2391 atomic_set(&card->tx_timeout_task_counter, 0);
2392
4cb6f9e5
LV		 2393 card->rx_chain.num_desc = rx_descriptors;
2394 card->rx_chain.ring = card->darray;
2395 card->tx_chain.num_desc = tx_descriptors;
2396 card->tx_chain.ring = card->darray + rx_descriptors;
2397
aaec0fab
JO		 2398 return card;
2399}
2400
2401/**
2402 * spider_net_undo_pci_setup - releases PCI ressources
2403 * @card: card structure
2404 *
2405 * spider_net_undo_pci_setup releases the mapped regions
2406 */
2407static void
2408spider_net_undo_pci_setup(struct spider_net_card *card)
2409{
2410 iounmap(card->regs);
2411 pci_release_regions(card->pdev);
2412}
2413
2414/**
2415 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
aaec0fab
JO		 2416 * @pdev: PCI device
2417 *
2418 * Returns the card structure or NULL if any errors occur
2419 *
2420 * spider_net_setup_pci_dev initializes pdev and together with the
2421 * functions called in spider_net_open configures the device so that
2422 * data can be transferred over it
2423 * The net_device structure is attached to the card structure, if the
2424 * function returns without error.
2425 **/
2426static struct spider_net_card *
2427spider_net_setup_pci_dev(struct pci_dev *pdev)
2428{
2429 struct spider_net_card *card;
2430 unsigned long mmio_start, mmio_len;
2431
2432 if (pci_enable_device(pdev)) {
e6311d85 2433 dev_err(&pdev->dev, "Couldn't enable PCI device\n");
aaec0fab
JO		 2434 return NULL;
2435 }
2436
2437 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
e6311d85
LV		 2438 dev_err(&pdev->dev,
2439 "Couldn't find proper PCI device base address.\n");
aaec0fab
JO		 2440 goto out_disable_dev;
2441 }
2442
2443 if (pci_request_regions(pdev, spider_net_driver_name)) {
e6311d85
LV		 2444 dev_err(&pdev->dev,
2445 "Couldn't obtain PCI resources, aborting.\n");
aaec0fab
JO		 2446 goto out_disable_dev;
2447 }
2448
2449 pci_set_master(pdev);
2450
2451 card = spider_net_alloc_card();
2452 if (!card) {
e6311d85
LV		 2453 dev_err(&pdev->dev,
2454 "Couldn't allocate net_device structure, aborting.\n");
aaec0fab
JO		 2455 goto out_release_regions;
2456 }
2457 card->pdev = pdev;
2458
2459 /* fetch base address and length of first resource */
2460 mmio_start = pci_resource_start(pdev, 0);
2461 mmio_len = pci_resource_len(pdev, 0);
2462
2463 card->netdev->mem_start = mmio_start;
2464 card->netdev->mem_end = mmio_start + mmio_len;
2465 card->regs = ioremap(mmio_start, mmio_len);
2466
2467 if (!card->regs) {
e6311d85
LV		 2468 dev_err(&pdev->dev,
2469 "Couldn't obtain PCI resources, aborting.\n");
aaec0fab
JO		 2470 goto out_release_regions;
2471 }
2472
2473 return card;
2474
2475out_release_regions:
2476 pci_release_regions(pdev);
2477out_disable_dev:
2478 pci_disable_device(pdev);
2479 pci_set_drvdata(pdev, NULL);
2480 return NULL;
2481}
2482
2483/**
2484 * spider_net_probe - initialization of a device
2485 * @pdev: PCI device
2486 * @ent: entry in the device id list
2487 *
2488 * Returns 0 on success, <0 on failure
2489 *
2490 * spider_net_probe initializes pdev and registers a net_device
2491 * structure for it. After that, the device can be ifconfig'ed up
2492 **/
2493static int __devinit
2494spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2495{
2496 int err = -EIO;
2497 struct spider_net_card *card;
2498
2499 card = spider_net_setup_pci_dev(pdev);
2500 if (!card)
2501 goto out;
2502
2503 spider_net_workaround_rxramfull(card);
2504 spider_net_init_card(card);
2505
2506 err = spider_net_setup_phy(card);
2507 if (err)
2508 goto out_undo_pci;
2509
aaec0fab
JO		 2510 err = spider_net_setup_netdev(card);
2511 if (err)
2512 goto out_undo_pci;
2513
2514 return 0;
2515
2516out_undo_pci:
2517 spider_net_undo_pci_setup(card);
2518 free_netdev(card->netdev);
2519out:
2520 return err;
2521}
2522
2523/**
2524 * spider_net_remove - removal of a device
2525 * @pdev: PCI device
2526 *
2527 * Returns 0 on success, <0 on failure
2528 *
2529 * spider_net_remove is called to remove the device and unregisters the
2530 * net_device
2531 **/
2532static void __devexit
2533spider_net_remove(struct pci_dev *pdev)
2534{
2535 struct net_device *netdev;
2536 struct spider_net_card *card;
2537
2538 netdev = pci_get_drvdata(pdev);
2539 card = netdev_priv(netdev);
2540
2541 wait_event(card->waitq,
2542 atomic_read(&card->tx_timeout_task_counter) == 0);
2543
2544 unregister_netdev(netdev);
543cec51
JO		 2545
2546 /* switch off card */
2547 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2548 SPIDER_NET_CKRCTRL_STOP_VALUE);
2549 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2550 SPIDER_NET_CKRCTRL_RUN_VALUE);
2551
aaec0fab
JO		 2552 spider_net_undo_pci_setup(card);
2553 free_netdev(netdev);
aaec0fab
JO		 2554}
2555
2556static struct pci_driver spider_net_driver = {
aaec0fab
JO		 2557 .name = spider_net_driver_name,
2558 .id_table = spider_net_pci_tbl,
2559 .probe = spider_net_probe,
2560 .remove = __devexit_p(spider_net_remove)
2561};
2562
2563/**
2564 * spider_net_init - init function when the driver is loaded
2565 *
2566 * spider_net_init registers the device driver
2567 */
2568static int __init spider_net_init(void)
2569{
90f10841
LV		 2570 printk(KERN_INFO "Spidernet version %s.\n", VERSION);
2571
aaec0fab
JO		 2572 if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
2573 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
2574 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2575 }
2576 if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
2577 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
2578 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2579 }
2580 if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
2581 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
2582 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2583 }
2584 if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
2585 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
2586 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2587 }
2588
2589 return pci_register_driver(&spider_net_driver);
2590}
2591
2592/**
2593 * spider_net_cleanup - exit function when driver is unloaded
2594 *
2595 * spider_net_cleanup unregisters the device driver
2596 */
2597static void __exit spider_net_cleanup(void)
2598{
2599 pci_unregister_driver(&spider_net_driver);
2600}
2601
2602module_init(spider_net_init);
2603module_exit(spider_net_cleanup);
Linux kernel - Deliverables
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