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ACPI: add dump_stack() to trace acpi_format_exception programming errors
[linux-2.6-block.git] / drivers / net / spider_net.c
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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
JO		 33#include <linux/init.h>
34#include <linux/ioport.h>
35#include <linux/ip.h>
36#include <linux/kernel.h>
37#include <linux/mii.h>
38#include <linux/module.h>
39#include <linux/netdevice.h>
40#include <linux/device.h>
41#include <linux/pci.h>
42#include <linux/skbuff.h>
43#include <linux/slab.h>
44#include <linux/tcp.h>
45#include <linux/types.h>
11f1a52b 46#include <linux/vmalloc.h>
aaec0fab
JO		 47#include <linux/wait.h>
48#include <linux/workqueue.h>
49#include <asm/bitops.h>
50#include <asm/pci-bridge.h>
51#include <net/checksum.h>
52
53#include "spider_net.h"
54
55MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com> and Jens Osterkamp " \
56 "<Jens.Osterkamp@de.ibm.com>");
57MODULE_DESCRIPTION("Spider Southbridge Gigabit Ethernet driver");
58MODULE_LICENSE("GPL");
90f10841 59MODULE_VERSION(VERSION);
aaec0fab
JO		 60
61static int rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_DEFAULT;
62static int tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_DEFAULT;
63
e2874f2e
LV		 64module_param(rx_descriptors, int, 0444);
65module_param(tx_descriptors, int, 0444);
aaec0fab
JO		 66
67MODULE_PARM_DESC(rx_descriptors, "number of descriptors used " \
68 "in rx chains");
69MODULE_PARM_DESC(tx_descriptors, "number of descriptors used " \
70 "in tx chain");
71
72char spider_net_driver_name[] = "spidernet";
73
74static struct pci_device_id spider_net_pci_tbl[] = {
75 { PCI_VENDOR_ID_TOSHIBA_2, PCI_DEVICE_ID_TOSHIBA_SPIDER_NET,
76 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
77 { 0, }
78};
79
80MODULE_DEVICE_TABLE(pci, spider_net_pci_tbl);
81
82/**
83 * spider_net_read_reg - reads an SMMIO register of a card
84 * @card: device structure
85 * @reg: register to read from
86 *
87 * returns the content of the specified SMMIO register.
88 */
bdd01503 89static inline u32
aaec0fab
JO		 90spider_net_read_reg(struct spider_net_card *card, u32 reg)
91{
3bc0f40c
BH		 92 /* We use the powerpc specific variants instead of readl_be() because
93 * we know spidernet is not a real PCI device and we can thus avoid the
94 * performance hit caused by the PCI workarounds.
95 */
96 return in_be32(card->regs + reg);
aaec0fab
JO		 97}
98
99/**
100 * spider_net_write_reg - writes to an SMMIO register of a card
101 * @card: device structure
102 * @reg: register to write to
103 * @value: value to write into the specified SMMIO register
104 */
bdd01503 105static inline void
aaec0fab
JO		 106spider_net_write_reg(struct spider_net_card *card, u32 reg, u32 value)
107{
3bc0f40c
BH		 108 /* We use the powerpc specific variants instead of writel_be() because
109 * we know spidernet is not a real PCI device and we can thus avoid the
110 * performance hit caused by the PCI workarounds.
111 */
112 out_be32(card->regs + reg, value);
aaec0fab
JO		 113}
114
aaec0fab
JO		 115/** spider_net_write_phy - write to phy register
116 * @netdev: adapter to be written to
117 * @mii_id: id of MII
118 * @reg: PHY register
119 * @val: value to be written to phy register
120 *
121 * spider_net_write_phy_register writes to an arbitrary PHY
122 * register via the spider GPCWOPCMD register. We assume the queue does
123 * not run full (not more than 15 commands outstanding).
124 **/
125static void
126spider_net_write_phy(struct net_device *netdev, int mii_id,
127 int reg, int val)
128{
129 struct spider_net_card *card = netdev_priv(netdev);
130 u32 writevalue;
131
132 writevalue = ((u32)mii_id << 21) |
133 ((u32)reg << 16) | ((u32)val);
134
135 spider_net_write_reg(card, SPIDER_NET_GPCWOPCMD, writevalue);
136}
137
138/** spider_net_read_phy - read from phy register
139 * @netdev: network device to be read from
140 * @mii_id: id of MII
141 * @reg: PHY register
142 *
143 * Returns value read from PHY register
144 *
145 * spider_net_write_phy reads from an arbitrary PHY
146 * register via the spider GPCROPCMD register
147 **/
148static int
149spider_net_read_phy(struct net_device *netdev, int mii_id, int reg)
150{
151 struct spider_net_card *card = netdev_priv(netdev);
152 u32 readvalue;
153
154 readvalue = ((u32)mii_id << 21) | ((u32)reg << 16);
155 spider_net_write_reg(card, SPIDER_NET_GPCROPCMD, readvalue);
156
157 /* we don't use semaphores to wait for an SPIDER_NET_GPROPCMPINT
158 * interrupt, as we poll for the completion of the read operation
159 * in spider_net_read_phy. Should take about 50 us */
160 do {
161 readvalue = spider_net_read_reg(card, SPIDER_NET_GPCROPCMD);
162 } while (readvalue & SPIDER_NET_GPREXEC);
163
164 readvalue &= SPIDER_NET_GPRDAT_MASK;
165
166 return readvalue;
167}
168
abdb66b5
KI		 169/**
170 * spider_net_setup_aneg - initial auto-negotiation setup
171 * @card: device structure
172 **/
173static void
174spider_net_setup_aneg(struct spider_net_card *card)
175{
176 struct mii_phy *phy = &card->phy;
177 u32 advertise = 0;
a1c38a4a 178 u16 bmsr, estat;
abdb66b5 179
a1c38a4a
IK		 180 bmsr = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
181 estat = spider_net_read_phy(card->netdev, phy->mii_id, MII_ESTATUS);
abdb66b5
KI		 182
183 if (bmsr & BMSR_10HALF)
184 advertise |= ADVERTISED_10baseT_Half;
185 if (bmsr & BMSR_10FULL)
186 advertise |= ADVERTISED_10baseT_Full;
187 if (bmsr & BMSR_100HALF)
188 advertise |= ADVERTISED_100baseT_Half;
189 if (bmsr & BMSR_100FULL)
190 advertise |= ADVERTISED_100baseT_Full;
191
192 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_TFULL))
193 advertise |= SUPPORTED_1000baseT_Full;
194 if ((bmsr & BMSR_ESTATEN) && (estat & ESTATUS_1000_THALF))
195 advertise |= SUPPORTED_1000baseT_Half;
196
197 mii_phy_probe(phy, phy->mii_id);
198 phy->def->ops->setup_aneg(phy, advertise);
199
200}
201
aaec0fab 202/**
11f1a52b 203 * spider_net_rx_irq_off - switch off rx irq on this spider card
aaec0fab
JO		 204 * @card: device structure
205 *
11f1a52b 206 * switches off rx irq by masking them out in the GHIINTnMSK register
aaec0fab
JO		 207 */
208static void
11f1a52b 209spider_net_rx_irq_off(struct spider_net_card *card)
aaec0fab
JO		 210{
211 u32 regvalue;
aaec0fab 212
11f1a52b
AB		 213 regvalue = SPIDER_NET_INT0_MASK_VALUE & (~SPIDER_NET_RXINT);
214 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
aaec0fab
JO		 215}
216
217/**
11f1a52b 218 * spider_net_rx_irq_on - switch on rx irq on this spider card
aaec0fab
JO		 219 * @card: device structure
220 *
11f1a52b 221 * switches on rx irq by enabling them in the GHIINTnMSK register
aaec0fab
JO		 222 */
223static void
11f1a52b 224spider_net_rx_irq_on(struct spider_net_card *card)
aaec0fab
JO		 225{
226 u32 regvalue;
aaec0fab 227
11f1a52b
AB		 228 regvalue = SPIDER_NET_INT0_MASK_VALUE | SPIDER_NET_RXINT;
229 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, regvalue);
aaec0fab
JO		 230}
231
232/**
233 * spider_net_set_promisc - sets the unicast address or the promiscuous mode
234 * @card: card structure
235 *
236 * spider_net_set_promisc sets the unicast destination address filter and
237 * thus either allows for non-promisc mode or promisc mode
238 */
239static void
240spider_net_set_promisc(struct spider_net_card *card)
241{
242 u32 macu, macl;
243 struct net_device *netdev = card->netdev;
244
245 if (netdev->flags & IFF_PROMISC) {
246 /* clear destination entry 0 */
247 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, 0);
248 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, 0);
249 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
250 SPIDER_NET_PROMISC_VALUE);
251 } else {
252 macu = netdev->dev_addr[0];
253 macu <<= 8;
254 macu |= netdev->dev_addr[1];
255 memcpy(&macl, &netdev->dev_addr[2], sizeof(macl));
256
257 macu |= SPIDER_NET_UA_DESCR_VALUE;
258 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR, macu);
259 spider_net_write_reg(card, SPIDER_NET_GMRUAFILnR + 0x04, macl);
260 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R,
261 SPIDER_NET_NONPROMISC_VALUE);
262 }
263}
264
265/**
266 * spider_net_get_mac_address - read mac address from spider card
267 * @card: device structure
268 *
269 * reads MAC address from GMACUNIMACU and GMACUNIMACL registers
270 */
271static int
272spider_net_get_mac_address(struct net_device *netdev)
273{
274 struct spider_net_card *card = netdev_priv(netdev);
275 u32 macl, macu;
276
277 macl = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACL);
278 macu = spider_net_read_reg(card, SPIDER_NET_GMACUNIMACU);
279
280 netdev->dev_addr[0] = (macu >> 24) & 0xff;
281 netdev->dev_addr[1] = (macu >> 16) & 0xff;
282 netdev->dev_addr[2] = (macu >> 8) & 0xff;
283 netdev->dev_addr[3] = macu & 0xff;
284 netdev->dev_addr[4] = (macl >> 8) & 0xff;
285 netdev->dev_addr[5] = macl & 0xff;
286
287 if (!is_valid_ether_addr(&netdev->dev_addr[0]))
288 return -EINVAL;
289
290 return 0;
291}
292
293/**
294 * spider_net_get_descr_status -- returns the status of a descriptor
295 * @descr: descriptor to look at
296 *
297 * returns the status as in the dmac_cmd_status field of the descriptor
298 */
bdd01503 299static inline int
4cb6f9e5 300spider_net_get_descr_status(struct spider_net_hw_descr *hwdescr)
aaec0fab 301{
4cb6f9e5 302 return hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_IND_PROC_MASK;
aaec0fab
JO		 303}
304
305/**
306 * spider_net_free_chain - free descriptor chain
307 * @card: card structure
308 * @chain: address of chain
309 *
310 */
311static void
312spider_net_free_chain(struct spider_net_card *card,
313 struct spider_net_descr_chain *chain)
314{
315 struct spider_net_descr *descr;
316
d4ed8f8d
LV		 317 descr = chain->ring;
318 do {
aaec0fab 319 descr->bus_addr = 0;
4cb6f9e5 320 descr->hwdescr->next_descr_addr = 0;
d4ed8f8d
LV		 321 descr = descr->next;
322 } while (descr != chain->ring);
323
324 dma_free_coherent(&card->pdev->dev, chain->num_desc,
4cb6f9e5 325 chain->hwring, chain->dma_addr);
aaec0fab
JO		 326}
327
328/**
d4ed8f8d 329 * spider_net_init_chain - alloc and link descriptor chain
aaec0fab
JO		 330 * @card: card structure
331 * @chain: address of chain
aaec0fab 332 *
d4ed8f8d 333 * We manage a circular list that mirrors the hardware structure,
aaec0fab
JO		 334 * except that the hardware uses bus addresses.
335 *
d4ed8f8d 336 * Returns 0 on success, <0 on failure
aaec0fab
JO		 337 */
338static int
339spider_net_init_chain(struct spider_net_card *card,
d4ed8f8d 340 struct spider_net_descr_chain *chain)
aaec0fab
JO		 341{
342 int i;
343 struct spider_net_descr *descr;
4cb6f9e5 344 struct spider_net_hw_descr *hwdescr;
11f1a52b 345 dma_addr_t buf;
d4ed8f8d 346 size_t alloc_size;
aaec0fab 347
4cb6f9e5 348 alloc_size = chain->num_desc * sizeof(struct spider_net_hw_descr);
aaec0fab 349
4cb6f9e5 350 chain->hwring = dma_alloc_coherent(&card->pdev->dev, alloc_size,
d4ed8f8d 351 &chain->dma_addr, GFP_KERNEL);
aaec0fab 352
4cb6f9e5 353 if (!chain->hwring)
d4ed8f8d 354 return -ENOMEM;
aaec0fab 355
4cb6f9e5 356 memset(chain->ring, 0, chain->num_desc * sizeof(struct spider_net_descr));
d4ed8f8d
LV		 357
358 /* Set up the hardware pointers in each descriptor */
4cb6f9e5
LV		 359 descr = chain->ring;
360 hwdescr = chain->hwring;
d4ed8f8d 361 buf = chain->dma_addr;
4cb6f9e5
LV		 362 for (i=0; i < chain->num_desc; i++, descr++, hwdescr++) {
363 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
364 hwdescr->next_descr_addr = 0;
aaec0fab 365
4cb6f9e5 366 descr->hwdescr = hwdescr;
11f1a52b 367 descr->bus_addr = buf;
aaec0fab
JO		 368 descr->next = descr + 1;
369 descr->prev = descr - 1;
370
4cb6f9e5 371 buf += sizeof(struct spider_net_hw_descr);
aaec0fab
JO		 372 }
373 /* do actual circular list */
d4ed8f8d
LV		 374 (descr-1)->next = chain->ring;
375 chain->ring->prev = descr-1;
aaec0fab 376
bdd01503 377 spin_lock_init(&chain->lock);
d4ed8f8d
LV		 378 chain->head = chain->ring;
379 chain->tail = chain->ring;
aaec0fab 380 return 0;
aaec0fab
JO		 381}
382
383/**
384 * spider_net_free_rx_chain_contents - frees descr contents in rx chain
385 * @card: card structure
386 *
387 * returns 0 on success, <0 on failure
388 */
389static void
390spider_net_free_rx_chain_contents(struct spider_net_card *card)
391{
392 struct spider_net_descr *descr;
393
394 descr = card->rx_chain.head;
64751910 395 do {
aaec0fab 396 if (descr->skb) {
4cb6f9e5 397 pci_unmap_single(card->pdev, descr->hwdescr->buf_addr,
11f1a52b 398 SPIDER_NET_MAX_FRAME,
348bc2a6 399 PCI_DMA_BIDIRECTIONAL);
d9c199ee
LV		 400 dev_kfree_skb(descr->skb);
401 descr->skb = NULL;
aaec0fab
JO		 402 }
403 descr = descr->next;
64751910 404 } while (descr != card->rx_chain.head);
aaec0fab
JO		 405}
406
407/**
a4182c50 408 * spider_net_prepare_rx_descr - Reinitialize RX descriptor
aaec0fab
JO		 409 * @card: card structure
410 * @descr: descriptor to re-init
411 *
a4182c50 412 * Return 0 on succes, <0 on failure.
aaec0fab 413 *
a4182c50
LV		 414 * Allocates a new rx skb, iommu-maps it and attaches it to the
415 * descriptor. Mark the descriptor as activated, ready-to-use.
aaec0fab
JO		 416 */
417static int
418spider_net_prepare_rx_descr(struct spider_net_card *card,
419 struct spider_net_descr *descr)
420{
4cb6f9e5 421 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
8e0a613b 422 dma_addr_t buf;
aaec0fab
JO		 423 int offset;
424 int bufsize;
425
426 /* we need to round up the buffer size to a multiple of 128 */
11f1a52b 427 bufsize = (SPIDER_NET_MAX_FRAME + SPIDER_NET_RXBUF_ALIGN - 1) &
aaec0fab
JO		 428 (~(SPIDER_NET_RXBUF_ALIGN - 1));
429
430 /* and we need to have it 128 byte aligned, therefore we allocate a
431 * bit more */
432 /* allocate an skb */
98739407
CH		 433 descr->skb = netdev_alloc_skb(card->netdev,
434 bufsize + SPIDER_NET_RXBUF_ALIGN - 1);
aaec0fab 435 if (!descr->skb) {
11f1a52b 436 if (netif_msg_rx_err(card) && net_ratelimit())
e6311d85
LV		 437 dev_err(&card->netdev->dev,
438 "Not enough memory to allocate rx buffer\n");
9b6b0b81 439 card->spider_stats.alloc_rx_skb_error++;
aaec0fab
JO		 440 return -ENOMEM;
441 }
4cb6f9e5
LV		 442 hwdescr->buf_size = bufsize;
443 hwdescr->result_size = 0;
444 hwdescr->valid_size = 0;
445 hwdescr->data_status = 0;
446 hwdescr->data_error = 0;
aaec0fab
JO		 447
448 offset = ((unsigned long)descr->skb->data) &
449 (SPIDER_NET_RXBUF_ALIGN - 1);
450 if (offset)
451 skb_reserve(descr->skb, SPIDER_NET_RXBUF_ALIGN - offset);
a4182c50 452 /* iommu-map the skb */
8e0a613b 453 buf = pci_map_single(card->pdev, descr->skb->data,
bdd01503 454 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
d4b0a4c1 455 if (pci_dma_mapping_error(buf)) {
aaec0fab 456 dev_kfree_skb_any(descr->skb);
d9c199ee 457 descr->skb = NULL;
11f1a52b 458 if (netif_msg_rx_err(card) && net_ratelimit())
e6311d85 459 dev_err(&card->netdev->dev, "Could not iommu-map rx buffer\n");
9b6b0b81 460 card->spider_stats.rx_iommu_map_error++;
4cb6f9e5 461 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
aaec0fab 462 } else {
4cb6f9e5 463 hwdescr->buf_addr = buf;
90476a20 464 wmb();
4cb6f9e5 465 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_CARDOWNED |
bdd01503 466 SPIDER_NET_DMAC_NOINTR_COMPLETE;
aaec0fab
JO		 467 }
468
a4182c50 469 return 0;
aaec0fab
JO		 470}
471
472/**
11f1a52b 473 * spider_net_enable_rxchtails - sets RX dmac chain tail addresses
aaec0fab
JO		 474 * @card: card structure
475 *
11f1a52b 476 * spider_net_enable_rxchtails sets the RX DMAC chain tail adresses in the
aaec0fab
JO		 477 * chip by writing to the appropriate register. DMA is enabled in
478 * spider_net_enable_rxdmac.
479 */
bdd01503 480static inline void
aaec0fab
JO		 481spider_net_enable_rxchtails(struct spider_net_card *card)
482{
483 /* assume chain is aligned correctly */
484 spider_net_write_reg(card, SPIDER_NET_GDADCHA ,
485 card->rx_chain.tail->bus_addr);
486}
487
488/**
489 * spider_net_enable_rxdmac - enables a receive DMA controller
490 * @card: card structure
491 *
492 * spider_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
493 * in the GDADMACCNTR register
494 */
bdd01503 495static inline void
aaec0fab
JO		 496spider_net_enable_rxdmac(struct spider_net_card *card)
497{
11f1a52b 498 wmb();
aaec0fab
JO		 499 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
500 SPIDER_NET_DMA_RX_VALUE);
501}
502
59a11f88
LV		 503/**
504 * spider_net_disable_rxdmac - disables the receive DMA controller
505 * @card: card structure
506 *
507 * spider_net_disable_rxdmac terminates processing on the DMA controller
508 * by turing off the DMA controller, with the force-end flag set.
509 */
510static inline void
511spider_net_disable_rxdmac(struct spider_net_card *card)
512{
513 spider_net_write_reg(card, SPIDER_NET_GDADMACCNTR,
514 SPIDER_NET_DMA_RX_FEND_VALUE);
515}
516
aaec0fab
JO		 517/**
518 * spider_net_refill_rx_chain - refills descriptors/skbs in the rx chains
519 * @card: card structure
520 *
11f1a52b 521 * refills descriptors in the rx chain: allocates skbs and iommu-maps them.
aaec0fab
JO		 522 */
523static void
524spider_net_refill_rx_chain(struct spider_net_card *card)
525{
bdd01503
JO		 526 struct spider_net_descr_chain *chain = &card->rx_chain;
527 unsigned long flags;
aaec0fab 528
11f1a52b
AB		 529 /* one context doing the refill (and a second context seeing that
530 * and omitting it) is ok. If called by NAPI, we'll be called again
531 * as spider_net_decode_one_descr is called several times. If some
532 * interrupt calls us, the NAPI is about to clean up anyway. */
bdd01503
JO		 533 if (!spin_trylock_irqsave(&chain->lock, flags))
534 return;
535
4cb6f9e5 536 while (spider_net_get_descr_status(chain->head->hwdescr) ==
bdd01503
JO		 537 SPIDER_NET_DESCR_NOT_IN_USE) {
538 if (spider_net_prepare_rx_descr(card, chain->head))
539 break;
540 chain->head = chain->head->next;
541 }
aaec0fab 542
bdd01503 543 spin_unlock_irqrestore(&chain->lock, flags);
aaec0fab
JO		 544}
545
546/**
2c307db7 547 * spider_net_alloc_rx_skbs - Allocates rx skbs in rx descriptor chains
aaec0fab
JO		 548 * @card: card structure
549 *
2c307db7 550 * Returns 0 on success, <0 on failure.
aaec0fab
JO		 551 */
552static int
553spider_net_alloc_rx_skbs(struct spider_net_card *card)
554{
2bf27a0d
LV		 555 struct spider_net_descr_chain *chain = &card->rx_chain;
556 struct spider_net_descr *start = chain->tail;
557 struct spider_net_descr *descr = start;
aaec0fab 558
2bf27a0d
LV		 559 /* Link up the hardware chain pointers */
560 do {
561 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
562 descr = descr->next;
563 } while (descr != start);
aaec0fab 564
2c307db7
LV		 565 /* Put at least one buffer into the chain. if this fails,
566 * we've got a problem. If not, spider_net_refill_rx_chain
567 * will do the rest at the end of this function. */
aaec0fab
JO		 568 if (spider_net_prepare_rx_descr(card, chain->head))
569 goto error;
570 else
571 chain->head = chain->head->next;
572
2c307db7
LV		 573 /* This will allocate the rest of the rx buffers;
574 * if not, it's business as usual later on. */
aaec0fab 575 spider_net_refill_rx_chain(card);
11f1a52b 576 spider_net_enable_rxdmac(card);
aaec0fab
JO		 577 return 0;
578
579error:
580 spider_net_free_rx_chain_contents(card);
2bf27a0d 581 return -ENOMEM;
aaec0fab
JO		 582}
583
aaec0fab
JO		 584/**
585 * spider_net_get_multicast_hash - generates hash for multicast filter table
586 * @addr: multicast address
587 *
588 * returns the hash value.
589 *
590 * spider_net_get_multicast_hash calculates a hash value for a given multicast
591 * address, that is used to set the multicast filter tables
592 */
593static u8
594spider_net_get_multicast_hash(struct net_device *netdev, __u8 *addr)
595{
aaec0fab
JO		 596 u32 crc;
597 u8 hash;
11f1a52b
AB		 598 char addr_for_crc[ETH_ALEN] = { 0, };
599 int i, bit;
600
601 for (i = 0; i < ETH_ALEN * 8; i++) {
602 bit = (addr[i / 8] >> (i % 8)) & 1;
603 addr_for_crc[ETH_ALEN - 1 - i / 8] += bit << (7 - (i % 8));
604 }
aaec0fab 605
11f1a52b 606 crc = crc32_be(~0, addr_for_crc, netdev->addr_len);
aaec0fab
JO		 607
608 hash = (crc >> 27);
609 hash <<= 3;
610 hash |= crc & 7;
11f1a52b 611 hash &= 0xff;
aaec0fab
JO		 612
613 return hash;
614}
615
616/**
617 * spider_net_set_multi - sets multicast addresses and promisc flags
618 * @netdev: interface device structure
619 *
620 * spider_net_set_multi configures multicast addresses as needed for the
621 * netdev interface. It also sets up multicast, allmulti and promisc
622 * flags appropriately
623 */
624static void
625spider_net_set_multi(struct net_device *netdev)
626{
627 struct dev_mc_list *mc;
628 u8 hash;
629 int i;
630 u32 reg;
631 struct spider_net_card *card = netdev_priv(netdev);
632 unsigned long bitmask[SPIDER_NET_MULTICAST_HASHES / BITS_PER_LONG] =
633 {0, };
634
635 spider_net_set_promisc(card);
636
637 if (netdev->flags & IFF_ALLMULTI) {
638 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES; i++) {
639 set_bit(i, bitmask);
640 }
641 goto write_hash;
642 }
643
644 /* well, we know, what the broadcast hash value is: it's xfd
645 hash = spider_net_get_multicast_hash(netdev, netdev->broadcast); */
646 set_bit(0xfd, bitmask);
647
648 for (mc = netdev->mc_list; mc; mc = mc->next) {
649 hash = spider_net_get_multicast_hash(netdev, mc->dmi_addr);
650 set_bit(hash, bitmask);
651 }
652
653write_hash:
654 for (i = 0; i < SPIDER_NET_MULTICAST_HASHES / 4; i++) {
655 reg = 0;
656 if (test_bit(i * 4, bitmask))
657 reg += 0x08;
658 reg <<= 8;
659 if (test_bit(i * 4 + 1, bitmask))
660 reg += 0x08;
661 reg <<= 8;
662 if (test_bit(i * 4 + 2, bitmask))
663 reg += 0x08;
664 reg <<= 8;
665 if (test_bit(i * 4 + 3, bitmask))
666 reg += 0x08;
667
668 spider_net_write_reg(card, SPIDER_NET_GMRMHFILnR + i * 4, reg);
669 }
670}
671
aaec0fab
JO		 672/**
673 * spider_net_prepare_tx_descr - fill tx descriptor with skb data
674 * @card: card structure
675 * @descr: descriptor structure to fill out
676 * @skb: packet to use
677 *
678 * returns 0 on success, <0 on failure.
679 *
680 * fills out the descriptor structure with skb data and len. Copies data,
681 * if needed (32bit DMA!)
682 */
683static int
684spider_net_prepare_tx_descr(struct spider_net_card *card,
aaec0fab
JO		 685 struct sk_buff *skb)
686{
d9c199ee 687 struct spider_net_descr_chain *chain = &card->tx_chain;
9cc7bf7e 688 struct spider_net_descr *descr;
4cb6f9e5 689 struct spider_net_hw_descr *hwdescr;
11f1a52b 690 dma_addr_t buf;
9cc7bf7e 691 unsigned long flags;
11f1a52b 692
9c434f5e 693 buf = pci_map_single(card->pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
d4b0a4c1 694 if (pci_dma_mapping_error(buf)) {
11f1a52b 695 if (netif_msg_tx_err(card) && net_ratelimit())
e6311d85 696 dev_err(&card->netdev->dev, "could not iommu-map packet (%p, %i). "
9c434f5e 697 "Dropping packet\n", skb->data, skb->len);
9b6b0b81 698 card->spider_stats.tx_iommu_map_error++;
aaec0fab
JO		 699 return -ENOMEM;
700 }
701
d9c199ee 702 spin_lock_irqsave(&chain->lock, flags);
9cc7bf7e 703 descr = card->tx_chain.head;
d9c199ee
LV		 704 if (descr->next == chain->tail->prev) {
705 spin_unlock_irqrestore(&chain->lock, flags);
706 pci_unmap_single(card->pdev, buf, skb->len, PCI_DMA_TODEVICE);
707 return -ENOMEM;
708 }
4cb6f9e5 709 hwdescr = descr->hwdescr;
d9c199ee 710 chain->head = descr->next;
9cc7bf7e 711
aaec0fab 712 descr->skb = skb;
4cb6f9e5
LV		 713 hwdescr->buf_addr = buf;
714 hwdescr->buf_size = skb->len;
715 hwdescr->next_descr_addr = 0;
716 hwdescr->data_status = 0;
aaec0fab 717
4cb6f9e5 718 hwdescr->dmac_cmd_status =
5f309b90 719 SPIDER_NET_DESCR_CARDOWNED | SPIDER_NET_DMAC_TXFRMTL;
d9c199ee 720 spin_unlock_irqrestore(&chain->lock, flags);
9cc7bf7e 721
3a2c892d 722 if (skb->ip_summed == CHECKSUM_PARTIAL)
eddc9ec5 723 switch (ip_hdr(skb)->protocol) {
bdd01503 724 case IPPROTO_TCP:
4cb6f9e5 725 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_TCP;
bdd01503
JO		 726 break;
727 case IPPROTO_UDP:
4cb6f9e5 728 hwdescr->dmac_cmd_status |= SPIDER_NET_DMAC_UDP;
bdd01503
JO		 729 break;
730 }
731
204e5fa1 732 /* Chain the bus address, so that the DMA engine finds this descr. */
4cb6f9e5
LV		 733 wmb();
734 descr->prev->hwdescr->next_descr_addr = descr->bus_addr;
bdd01503 735
917a5b8e 736 card->netdev->trans_start = jiffies; /* set netdev watchdog timer */
bdd01503
JO		 737 return 0;
738}
739
a664ccf4 740static int
204e5fa1
LV		 741spider_net_set_low_watermark(struct spider_net_card *card)
742{
4cb6f9e5
LV		 743 struct spider_net_descr *descr = card->tx_chain.tail;
744 struct spider_net_hw_descr *hwdescr;
9cc7bf7e 745 unsigned long flags;
204e5fa1
LV		 746 int status;
747 int cnt=0;
748 int i;
204e5fa1 749
9cc7bf7e
LV		 750 /* Measure the length of the queue. Measurement does not
751 * need to be precise -- does not need a lock. */
204e5fa1 752 while (descr != card->tx_chain.head) {
4cb6f9e5 753 status = descr->hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_NOT_IN_USE;
204e5fa1
LV		 754 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
755 break;
756 descr = descr->next;
757 cnt++;
758 }
759
760 /* If TX queue is short, don't even bother with interrupts */
d4ed8f8d 761 if (cnt < card->tx_chain.num_desc/4)
a664ccf4 762 return cnt;
204e5fa1
LV		 763
764 /* Set low-watermark 3/4th's of the way into the queue. */
765 descr = card->tx_chain.tail;
766 cnt = (cnt*3)/4;
767 for (i=0;i<cnt; i++)
768 descr = descr->next;
769
770 /* Set the new watermark, clear the old watermark */
9cc7bf7e 771 spin_lock_irqsave(&card->tx_chain.lock, flags);
4cb6f9e5
LV		 772 descr->hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_TXDESFLG;
773 if (card->low_watermark && card->low_watermark != descr) {
774 hwdescr = card->low_watermark->hwdescr;
775 hwdescr->dmac_cmd_status =
776 hwdescr->dmac_cmd_status & ~SPIDER_NET_DESCR_TXDESFLG;
777 }
204e5fa1 778 card->low_watermark = descr;
9cc7bf7e 779 spin_unlock_irqrestore(&card->tx_chain.lock, flags);
a664ccf4 780 return cnt;
204e5fa1
LV		 781}
782
bdd01503
JO		 783/**
784 * spider_net_release_tx_chain - processes sent tx descriptors
785 * @card: adapter structure
786 * @brutal: if set, don't care about whether descriptor seems to be in use
787 *
788 * returns 0 if the tx ring is empty, otherwise 1.
789 *
790 * spider_net_release_tx_chain releases the tx descriptors that spider has
791 * finished with (if non-brutal) or simply release tx descriptors (if brutal).
792 * If some other context is calling this function, we return 1 so that we're
793 * scheduled again (if we were scheduled) and will not loose initiative.
794 */
795static int
796spider_net_release_tx_chain(struct spider_net_card *card, int brutal)
797{
798 struct spider_net_descr_chain *chain = &card->tx_chain;
9cc7bf7e 799 struct spider_net_descr *descr;
4cb6f9e5 800 struct spider_net_hw_descr *hwdescr;
9cc7bf7e
LV		 801 struct sk_buff *skb;
802 u32 buf_addr;
803 unsigned long flags;
bdd01503
JO		 804 int status;
805
5c8e98fe 806 while (1) {
9cc7bf7e 807 spin_lock_irqsave(&chain->lock, flags);
5c8e98fe
LV		 808 if (chain->tail == chain->head) {
809 spin_unlock_irqrestore(&chain->lock, flags);
810 return 0;
811 }
9cc7bf7e 812 descr = chain->tail;
4cb6f9e5 813 hwdescr = descr->hwdescr;
9cc7bf7e 814
4cb6f9e5 815 status = spider_net_get_descr_status(hwdescr);
bdd01503
JO		 816 switch (status) {
817 case SPIDER_NET_DESCR_COMPLETE:
818 card->netdev_stats.tx_packets++;
9cc7bf7e 819 card->netdev_stats.tx_bytes += descr->skb->len;
bdd01503
JO		 820 break;
821
822 case SPIDER_NET_DESCR_CARDOWNED:
9cc7bf7e
LV		 823 if (!brutal) {
824 spin_unlock_irqrestore(&chain->lock, flags);
bdd01503 825 return 1;
9cc7bf7e
LV		 826 }
827
bdd01503
JO		 828 /* fallthrough, if we release the descriptors
829 * brutally (then we don't care about
830 * SPIDER_NET_DESCR_CARDOWNED) */
831
832 case SPIDER_NET_DESCR_RESPONSE_ERROR:
833 case SPIDER_NET_DESCR_PROTECTION_ERROR:
834 case SPIDER_NET_DESCR_FORCE_END:
835 if (netif_msg_tx_err(card))
e6311d85
LV		 836 dev_err(&card->netdev->dev, "forcing end of tx descriptor "
837 "with status x%02x\n", status);
bdd01503
JO		 838 card->netdev_stats.tx_errors++;
839 break;
840
841 default:
842 card->netdev_stats.tx_dropped++;
9cc7bf7e
LV		 843 if (!brutal) {
844 spin_unlock_irqrestore(&chain->lock, flags);
c3fee4c5 845 return 1;
9cc7bf7e 846 }
bdd01503 847 }
aaec0fab 848
9cc7bf7e 849 chain->tail = descr->next;
4cb6f9e5 850 hwdescr->dmac_cmd_status |= SPIDER_NET_DESCR_NOT_IN_USE;
9cc7bf7e 851 skb = descr->skb;
d9c199ee 852 descr->skb = NULL;
4cb6f9e5 853 buf_addr = hwdescr->buf_addr;
9cc7bf7e
LV		 854 spin_unlock_irqrestore(&chain->lock, flags);
855
856 /* unmap the skb */
857 if (skb) {
9c434f5e
JL		 858 pci_unmap_single(card->pdev, buf_addr, skb->len,
859 PCI_DMA_TODEVICE);
9cc7bf7e
LV		 860 dev_kfree_skb(skb);
861 }
862 }
aaec0fab
JO		 863 return 0;
864}
865
866/**
867 * spider_net_kick_tx_dma - enables TX DMA processing
868 * @card: card structure
869 * @descr: descriptor address to enable TX processing at
870 *
a664ccf4
LV		 871 * This routine will start the transmit DMA running if
872 * it is not already running. This routine ned only be
873 * called when queueing a new packet to an empty tx queue.
874 * Writes the current tx chain head as start address
875 * of the tx descriptor chain and enables the transmission
876 * DMA engine.
aaec0fab 877 */
bdd01503
JO		 878static inline void
879spider_net_kick_tx_dma(struct spider_net_card *card)
aaec0fab 880{
bdd01503 881 struct spider_net_descr *descr;
aaec0fab 882
bdd01503
JO		 883 if (spider_net_read_reg(card, SPIDER_NET_GDTDMACCNTR) &
884 SPIDER_NET_TX_DMA_EN)
885 goto out;
aaec0fab 886
bdd01503
JO		 887 descr = card->tx_chain.tail;
888 for (;;) {
4cb6f9e5 889 if (spider_net_get_descr_status(descr->hwdescr) ==
bdd01503
JO		 890 SPIDER_NET_DESCR_CARDOWNED) {
891 spider_net_write_reg(card, SPIDER_NET_GDTDCHA,
892 descr->bus_addr);
893 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
894 SPIDER_NET_DMA_TX_VALUE);
895 break;
896 }
897 if (descr == card->tx_chain.head)
898 break;
899 descr = descr->next;
900 }
901
902out:
903 mod_timer(&card->tx_timer, jiffies + SPIDER_NET_TX_TIMER);
aaec0fab
JO		 904}
905
906/**
907 * spider_net_xmit - transmits a frame over the device
908 * @skb: packet to send out
909 * @netdev: interface device structure
910 *
bdd01503 911 * returns 0 on success, !0 on failure
aaec0fab
JO		 912 */
913static int
914spider_net_xmit(struct sk_buff *skb, struct net_device *netdev)
915{
a664ccf4 916 int cnt;
aaec0fab 917 struct spider_net_card *card = netdev_priv(netdev);
bdd01503 918
11f1a52b 919 spider_net_release_tx_chain(card, 0);
aaec0fab 920
d9c199ee 921 if (spider_net_prepare_tx_descr(card, skb) != 0) {
9b6b0b81 922 card->netdev_stats.tx_dropped++;
313ef4b7
LV		 923 netif_stop_queue(netdev);
924 return NETDEV_TX_BUSY;
bdd01503 925 }
aaec0fab 926
a664ccf4
LV		 927 cnt = spider_net_set_low_watermark(card);
928 if (cnt < 5)
929 spider_net_kick_tx_dma(card);
313ef4b7 930 return NETDEV_TX_OK;
bdd01503 931}
11f1a52b 932
bdd01503
JO		 933/**
934 * spider_net_cleanup_tx_ring - cleans up the TX ring
935 * @card: card structure
936 *
68a8c609
LV		 937 * spider_net_cleanup_tx_ring is called by either the tx_timer
938 * or from the NAPI polling routine.
939 * This routine releases resources associted with transmitted
940 * packets, including updating the queue tail pointer.
bdd01503
JO		 941 */
942static void
943spider_net_cleanup_tx_ring(struct spider_net_card *card)
944{
bdd01503 945 if ((spider_net_release_tx_chain(card, 0) != 0) &&
313ef4b7 946 (card->netdev->flags & IFF_UP)) {
bdd01503 947 spider_net_kick_tx_dma(card);
313ef4b7
LV		 948 netif_wake_queue(card->netdev);
949 }
aaec0fab
JO		 950}
951
952/**
953 * spider_net_do_ioctl - called for device ioctls
954 * @netdev: interface device structure
955 * @ifr: request parameter structure for ioctl
956 * @cmd: command code for ioctl
957 *
958 * returns 0 on success, <0 on failure. Currently, we have no special ioctls.
959 * -EOPNOTSUPP is returned, if an unknown ioctl was requested
960 */
961static int
962spider_net_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
963{
964 switch (cmd) {
965 default:
966 return -EOPNOTSUPP;
967 }
968}
969
970/**
971 * spider_net_pass_skb_up - takes an skb from a descriptor and passes it on
972 * @descr: descriptor to process
973 * @card: card structure
974 *
05b346b5
LV		 975 * Fills out skb structure and passes the data to the stack.
976 * The descriptor state is not changed.
aaec0fab 977 */
7f7223b8 978static void
aaec0fab 979spider_net_pass_skb_up(struct spider_net_descr *descr,
1cd173f6 980 struct spider_net_card *card)
aaec0fab 981{
4cb6f9e5 982 struct spider_net_hw_descr *hwdescr= descr->hwdescr;
aaec0fab
JO		 983 struct sk_buff *skb;
984 struct net_device *netdev;
985 u32 data_status, data_error;
986
4cb6f9e5
LV		 987 data_status = hwdescr->data_status;
988 data_error = hwdescr->data_error;
aaec0fab
JO		 989 netdev = card->netdev;
990
11f1a52b 991 skb = descr->skb;
4cb6f9e5 992 skb_put(skb, hwdescr->valid_size);
aaec0fab
JO		 993
994 /* the card seems to add 2 bytes of junk in front
995 * of the ethernet frame */
996#define SPIDER_MISALIGN 2
997 skb_pull(skb, SPIDER_MISALIGN);
998 skb->protocol = eth_type_trans(skb, netdev);
999
1000 /* checksum offload */
1001 if (card->options.rx_csum) {
11f1a52b
AB		 1002 if ( ( (data_status & SPIDER_NET_DATA_STATUS_CKSUM_MASK) ==
1003 SPIDER_NET_DATA_STATUS_CKSUM_MASK) &&
1004 !(data_error & SPIDER_NET_DATA_ERR_CKSUM_MASK))
aaec0fab
JO		 1005 skb->ip_summed = CHECKSUM_UNNECESSARY;
1006 else
1007 skb->ip_summed = CHECKSUM_NONE;
11f1a52b 1008 } else
aaec0fab 1009 skb->ip_summed = CHECKSUM_NONE;
aaec0fab
JO		 1010
1011 if (data_status & SPIDER_NET_VLAN_PACKET) {
1012 /* further enhancements: HW-accel VLAN
1013 * vlan_hwaccel_receive_skb
1014 */
1015 }
1016
aaec0fab
JO		 1017 /* update netdevice statistics */
1018 card->netdev_stats.rx_packets++;
1019 card->netdev_stats.rx_bytes += skb->len;
93c1d3b7
FM		 1020
1021 /* pass skb up to stack */
1022 netif_receive_skb(skb);
aaec0fab
JO		 1023}
1024
6d24998f
LV		 1025static void show_rx_chain(struct spider_net_card *card)
1026{
1027 struct spider_net_descr_chain *chain = &card->rx_chain;
1028 struct spider_net_descr *start= chain->tail;
1029 struct spider_net_descr *descr= start;
9948357d
LV		 1030 struct spider_net_hw_descr *hwd = start->hwdescr;
1031 struct device *dev = &card->netdev->dev;
1032 u32 curr_desc, next_desc;
6d24998f
LV		 1033 int status;
1034
9948357d 1035 int tot = 0;
6d24998f 1036 int cnt = 0;
9948357d
LV		 1037 int off = start - chain->ring;
1038 int cstat = hwd->dmac_cmd_status;
1039
1040 dev_info(dev, "Total number of descrs=%d\n",
1041 chain->num_desc);
1042 dev_info(dev, "Chain tail located at descr=%d, status=0x%x\n",
1043 off, cstat);
1044
1045 curr_desc = spider_net_read_reg(card, SPIDER_NET_GDACTDPA);
1046 next_desc = spider_net_read_reg(card, SPIDER_NET_GDACNEXTDA);
1047
6d24998f
LV		 1048 status = cstat;
1049 do
1050 {
9948357d
LV		 1051 hwd = descr->hwdescr;
1052 off = descr - chain->ring;
1053 status = hwd->dmac_cmd_status;
1054
1055 if (descr == chain->head)
1056 dev_info(dev, "Chain head is at %d, head status=0x%x\n",
1057 off, status);
1058
1059 if (curr_desc == descr->bus_addr)
1060 dev_info(dev, "HW curr desc (GDACTDPA) is at %d, status=0x%x\n",
1061 off, status);
1062
1063 if (next_desc == descr->bus_addr)
1064 dev_info(dev, "HW next desc (GDACNEXTDA) is at %d, status=0x%x\n",
1065 off, status);
1066
1067 if (hwd->next_descr_addr == 0)
1068 dev_info(dev, "chain is cut at %d\n", off);
1069
6d24998f 1070 if (cstat != status) {
9948357d
LV		 1071 int from = (chain->num_desc + off - cnt) % chain->num_desc;
1072 int to = (chain->num_desc + off - 1) % chain->num_desc;
1073 dev_info(dev, "Have %d (from %d to %d) descrs "
1074 "with stat=0x%08x\n", cnt, from, to, cstat);
6d24998f
LV		 1075 cstat = status;
1076 cnt = 0;
1077 }
9948357d 1078
6d24998f 1079 cnt ++;
9948357d
LV		 1080 tot ++;
1081 descr = descr->next;
1082 } while (descr != start);
1083
1084 dev_info(dev, "Last %d descrs with stat=0x%08x "
1085 "for a total of %d descrs\n", cnt, cstat, tot);
1086
1087#ifdef DEBUG
1088 /* Now dump the whole ring */
1089 descr = start;
1090 do
1091 {
1092 struct spider_net_hw_descr *hwd = descr->hwdescr;
1093 status = spider_net_get_descr_status(hwd);
1094 cnt = descr - chain->ring;
1095 dev_info(dev, "Descr %d stat=0x%08x skb=%p\n",
1096 cnt, status, descr->skb);
1097 dev_info(dev, "bus addr=%08x buf addr=%08x sz=%d\n",
1098 descr->bus_addr, hwd->buf_addr, hwd->buf_size);
1099 dev_info(dev, "next=%08x result sz=%d valid sz=%d\n",
1100 hwd->next_descr_addr, hwd->result_size,
1101 hwd->valid_size);
1102 dev_info(dev, "dmac=%08x data stat=%08x data err=%08x\n",
1103 hwd->dmac_cmd_status, hwd->data_status,
1104 hwd->data_error);
1105 dev_info(dev, "\n");
1106
6d24998f
LV		 1107 descr = descr->next;
1108 } while (descr != start);
6d24998f
LV		 1109#endif
1110
9948357d
LV		 1111}
1112
4c4bd5a9
LV		 1113/**
1114 * spider_net_resync_head_ptr - Advance head ptr past empty descrs
1115 *
1116 * If the driver fails to keep up and empty the queue, then the
1117 * hardware wil run out of room to put incoming packets. This
1118 * will cause the hardware to skip descrs that are full (instead
1119 * of halting/retrying). Thus, once the driver runs, it wil need
1120 * to "catch up" to where the hardware chain pointer is at.
1121 */
1122static void spider_net_resync_head_ptr(struct spider_net_card *card)
1123{
1124 unsigned long flags;
1125 struct spider_net_descr_chain *chain = &card->rx_chain;
1126 struct spider_net_descr *descr;
1127 int i, status;
1128
1129 /* Advance head pointer past any empty descrs */
1130 descr = chain->head;
1131 status = spider_net_get_descr_status(descr->hwdescr);
1132
1133 if (status == SPIDER_NET_DESCR_NOT_IN_USE)
1134 return;
1135
1136 spin_lock_irqsave(&chain->lock, flags);
1137
1138 descr = chain->head;
1139 status = spider_net_get_descr_status(descr->hwdescr);
1140 for (i=0; i<chain->num_desc; i++) {
1141 if (status != SPIDER_NET_DESCR_CARDOWNED) break;
1142 descr = descr->next;
1143 status = spider_net_get_descr_status(descr->hwdescr);
1144 }
1145 chain->head = descr;
1146
1147 spin_unlock_irqrestore(&chain->lock, flags);
1148}
1149
1150static int spider_net_resync_tail_ptr(struct spider_net_card *card)
1151{
1152 struct spider_net_descr_chain *chain = &card->rx_chain;
1153 struct spider_net_descr *descr;
1154 int i, status;
1155
1156 /* Advance tail pointer past any empty and reaped descrs */
1157 descr = chain->tail;
1158 status = spider_net_get_descr_status(descr->hwdescr);
1159
1160 for (i=0; i<chain->num_desc; i++) {
1161 if ((status != SPIDER_NET_DESCR_CARDOWNED) &&
1162 (status != SPIDER_NET_DESCR_NOT_IN_USE)) break;
1163 descr = descr->next;
1164 status = spider_net_get_descr_status(descr->hwdescr);
1165 }
1166 chain->tail = descr;
1167
1168 if ((i == chain->num_desc) || (i == 0))
1169 return 1;
1170 return 0;
1171}
1172
aaec0fab 1173/**
7376e732 1174 * spider_net_decode_one_descr - processes an RX descriptor
aaec0fab
JO		 1175 * @card: card structure
1176 *
7376e732 1177 * Returns 1 if a packet has been sent to the stack, otherwise 0.
aaec0fab 1178 *
7376e732
LV		 1179 * Processes an RX descriptor by iommu-unmapping the data buffer
1180 * and passing the packet up to the stack. This function is called
1181 * in softirq context, e.g. either bottom half from interrupt or
1182 * NAPI polling context.
aaec0fab
JO		 1183 */
1184static int
1cd173f6 1185spider_net_decode_one_descr(struct spider_net_card *card)
aaec0fab 1186{
bdd01503
JO		 1187 struct spider_net_descr_chain *chain = &card->rx_chain;
1188 struct spider_net_descr *descr = chain->tail;
4cb6f9e5 1189 struct spider_net_hw_descr *hwdescr = descr->hwdescr;
9e0a6e25 1190 u32 hw_buf_addr;
bdd01503 1191 int status;
aaec0fab 1192
4cb6f9e5 1193 status = spider_net_get_descr_status(hwdescr);
aaec0fab 1194
80dab7c7
LV		 1195 /* Nothing in the descriptor, or ring must be empty */
1196 if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
1197 (status == SPIDER_NET_DESCR_NOT_IN_USE))
1cd173f6 1198 return 0;
aaec0fab 1199
11f1a52b 1200 /* descriptor definitively used -- move on tail */
aaec0fab
JO		 1201 chain->tail = descr->next;
1202
05b346b5 1203 /* unmap descriptor */
9e0a6e25
LV		 1204 hw_buf_addr = hwdescr->buf_addr;
1205 hwdescr->buf_addr = 0xffffffff;
1206 pci_unmap_single(card->pdev, hw_buf_addr,
05b346b5
LV		 1207 SPIDER_NET_MAX_FRAME, PCI_DMA_FROMDEVICE);
1208
aaec0fab
JO		 1209 if ( (status == SPIDER_NET_DESCR_RESPONSE_ERROR) ||
1210 (status == SPIDER_NET_DESCR_PROTECTION_ERROR) ||
1211 (status == SPIDER_NET_DESCR_FORCE_END) ) {
1212 if (netif_msg_rx_err(card))
e6311d85
LV		 1213 dev_err(&card->netdev->dev,
1214 "dropping RX descriptor with state %d\n", status);
aaec0fab 1215 card->netdev_stats.rx_dropped++;
7f7223b8 1216 goto bad_desc;
aaec0fab
JO		 1217 }
1218
1219 if ( (status != SPIDER_NET_DESCR_COMPLETE) &&
1220 (status != SPIDER_NET_DESCR_FRAME_END) ) {
5a028877 1221 if (netif_msg_rx_err(card))
e6311d85
LV		 1222 dev_err(&card->netdev->dev,
1223 "RX descriptor with unknown state %d\n", status);
5a028877 1224 card->spider_stats.rx_desc_unk_state++;
7f7223b8 1225 goto bad_desc;
aaec0fab
JO		 1226 }
1227
366684bd 1228 /* The cases we'll throw away the packet immediately */
4cb6f9e5 1229 if (hwdescr->data_error & SPIDER_NET_DESTROY_RX_FLAGS) {
366684bd 1230 if (netif_msg_rx_err(card))
e6311d85
LV		 1231 dev_err(&card->netdev->dev,
1232 "error in received descriptor found, "
366684bd 1233 "data_status=x%08x, data_error=x%08x\n",
4cb6f9e5 1234 hwdescr->data_status, hwdescr->data_error);
7f7223b8 1235 goto bad_desc;
366684bd
LV		 1236 }
1237
e65bbf13 1238 if (hwdescr->dmac_cmd_status & SPIDER_NET_DESCR_BAD_STATUS) {
e6311d85 1239 dev_err(&card->netdev->dev, "bad status, cmd_status=x%08x\n",
4cb6f9e5 1240 hwdescr->dmac_cmd_status);
9e0a6e25 1241 pr_err("buf_addr=x%08x\n", hw_buf_addr);
4cb6f9e5
LV		 1242 pr_err("buf_size=x%08x\n", hwdescr->buf_size);
1243 pr_err("next_descr_addr=x%08x\n", hwdescr->next_descr_addr);
1244 pr_err("result_size=x%08x\n", hwdescr->result_size);
1245 pr_err("valid_size=x%08x\n", hwdescr->valid_size);
1246 pr_err("data_status=x%08x\n", hwdescr->data_status);
1247 pr_err("data_error=x%08x\n", hwdescr->data_error);
6d24998f
LV		 1248 pr_err("which=%ld\n", descr - card->rx_chain.ring);
1249
1250 card->spider_stats.rx_desc_error++;
1251 goto bad_desc;
1252 }
1253
7f7223b8
LV		 1254 /* Ok, we've got a packet in descr */
1255 spider_net_pass_skb_up(descr, card);
83d35145 1256 descr->skb = NULL;
4cb6f9e5 1257 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
7f7223b8
LV		 1258 return 1;
1259
1260bad_desc:
9948357d
LV		 1261 if (netif_msg_rx_err(card))
1262 show_rx_chain(card);
7f7223b8 1263 dev_kfree_skb_irq(descr->skb);
d9c199ee 1264 descr->skb = NULL;
4cb6f9e5 1265 hwdescr->dmac_cmd_status = SPIDER_NET_DESCR_NOT_IN_USE;
7f7223b8 1266 return 0;
aaec0fab
JO		 1267}
1268
1269/**
1270 * spider_net_poll - NAPI poll function called by the stack to return packets
1271 * @netdev: interface device structure
1272 * @budget: number of packets we can pass to the stack at most
1273 *
1274 * returns 0 if no more packets available to the driver/stack. Returns 1,
1275 * if the quota is exceeded, but the driver has still packets.
1276 *
1277 * spider_net_poll returns all packets from the rx descriptors to the stack
1278 * (using netif_receive_skb). If all/enough packets are up, the driver
1279 * reenables interrupts and returns 0. If not, 1 is returned.
1280 */
1281static int
1282spider_net_poll(struct net_device *netdev, int *budget)
1283{
1284 struct spider_net_card *card = netdev_priv(netdev);
1285 int packets_to_do, packets_done = 0;
1286 int no_more_packets = 0;
1287
1288 packets_to_do = min(*budget, netdev->quota);
1289
1290 while (packets_to_do) {
1cd173f6 1291 if (spider_net_decode_one_descr(card)) {
aaec0fab
JO		 1292 packets_done++;
1293 packets_to_do--;
1294 } else {
1295 /* no more packets for the stack */
1296 no_more_packets = 1;
1297 break;
1298 }
1299 }
1300
4c4bd5a9
LV		 1301 if ((packets_done == 0) && (card->num_rx_ints != 0)) {
1302 no_more_packets = spider_net_resync_tail_ptr(card);
1303 spider_net_resync_head_ptr(card);
1304 }
1305 card->num_rx_ints = 0;
1306
aaec0fab
JO		 1307 netdev->quota -= packets_done;
1308 *budget -= packets_done;
11f1a52b 1309 spider_net_refill_rx_chain(card);
80dab7c7 1310 spider_net_enable_rxdmac(card);
aaec0fab 1311
e1fd9070
LV		 1312 spider_net_cleanup_tx_ring(card);
1313
aaec0fab
JO		 1314 /* if all packets are in the stack, enable interrupts and return 0 */
1315 /* if not, return 1 */
1316 if (no_more_packets) {
1317 netif_rx_complete(netdev);
1318 spider_net_rx_irq_on(card);
c3d1182a 1319 card->ignore_rx_ramfull = 0;
aaec0fab
JO		 1320 return 0;
1321 }
1322
1323 return 1;
1324}
1325
aaec0fab
JO		 1326/**
1327 * spider_net_get_stats - get interface statistics
1328 * @netdev: interface device structure
1329 *
1330 * returns the interface statistics residing in the spider_net_card struct
1331 */
1332static struct net_device_stats *
1333spider_net_get_stats(struct net_device *netdev)
1334{
1335 struct spider_net_card *card = netdev_priv(netdev);
1336 struct net_device_stats *stats = &card->netdev_stats;
1337 return stats;
1338}
1339
1340/**
1341 * spider_net_change_mtu - changes the MTU of an interface
1342 * @netdev: interface device structure
1343 * @new_mtu: new MTU value
1344 *
1345 * returns 0 on success, <0 on failure
1346 */
1347static int
1348spider_net_change_mtu(struct net_device *netdev, int new_mtu)
1349{
1350 /* no need to re-alloc skbs or so -- the max mtu is about 2.3k
1351 * and mtu is outbound only anyway */
1352 if ( (new_mtu < SPIDER_NET_MIN_MTU ) ||
1353 (new_mtu > SPIDER_NET_MAX_MTU) )
1354 return -EINVAL;
1355 netdev->mtu = new_mtu;
1356 return 0;
1357}
1358
1359/**
1360 * spider_net_set_mac - sets the MAC of an interface
1361 * @netdev: interface device structure
1362 * @ptr: pointer to new MAC address
1363 *
1364 * Returns 0 on success, <0 on failure. Currently, we don't support this
1365 * and will always return EOPNOTSUPP.
1366 */
1367static int
1368spider_net_set_mac(struct net_device *netdev, void *p)
1369{
1370 struct spider_net_card *card = netdev_priv(netdev);
054034db 1371 u32 macl, macu, regvalue;
aaec0fab
JO		 1372 struct sockaddr *addr = p;
1373
aaec0fab
JO		 1374 if (!is_valid_ether_addr(addr->sa_data))
1375 return -EADDRNOTAVAIL;
1376
054034db
JO		 1377 /* switch off GMACTPE and GMACRPE */
1378 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1379 regvalue &= ~((1 << 5) | (1 << 6));
1380 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1381
1382 /* write mac */
aaec0fab
JO		 1383 macu = (addr->sa_data[0]<<24) + (addr->sa_data[1]<<16) +
1384 (addr->sa_data[2]<<8) + (addr->sa_data[3]);
1385 macl = (addr->sa_data[4]<<8) + (addr->sa_data[5]);
1386 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACU, macu);
1387 spider_net_write_reg(card, SPIDER_NET_GMACUNIMACL, macl);
1388
054034db
JO		 1389 /* switch GMACTPE and GMACRPE back on */
1390 regvalue = spider_net_read_reg(card, SPIDER_NET_GMACOPEMD);
1391 regvalue |= ((1 << 5) | (1 << 6));
1392 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD, regvalue);
1393
aaec0fab
JO		 1394 spider_net_set_promisc(card);
1395
1396 /* look up, whether we have been successful */
1397 if (spider_net_get_mac_address(netdev))
1398 return -EADDRNOTAVAIL;
1399 if (memcmp(netdev->dev_addr,addr->sa_data,netdev->addr_len))
1400 return -EADDRNOTAVAIL;
1401
1402 return 0;
1403}
1404
abdb66b5
KI		 1405/**
1406 * spider_net_link_reset
1407 * @netdev: net device structure
1408 *
1409 * This is called when the PHY_LINK signal is asserted. For the blade this is
1410 * not connected so we should never get here.
1411 *
1412 */
1413static void
1414spider_net_link_reset(struct net_device *netdev)
1415{
1416
1417 struct spider_net_card *card = netdev_priv(netdev);
1418
1419 del_timer_sync(&card->aneg_timer);
1420
1421 /* clear interrupt, block further interrupts */
1422 spider_net_write_reg(card, SPIDER_NET_GMACST,
1423 spider_net_read_reg(card, SPIDER_NET_GMACST));
1424 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1425
1426 /* reset phy and setup aneg */
1427 spider_net_setup_aneg(card);
1428 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
1429
1430}
1431
aaec0fab
JO		 1432/**
1433 * spider_net_handle_error_irq - handles errors raised by an interrupt
1434 * @card: card structure
1435 * @status_reg: interrupt status register 0 (GHIINT0STS)
1436 *
1437 * spider_net_handle_error_irq treats or ignores all error conditions
1438 * found when an interrupt is presented
1439 */
1440static void
1441spider_net_handle_error_irq(struct spider_net_card *card, u32 status_reg)
1442{
1443 u32 error_reg1, error_reg2;
7a627558 1444 u32 mask_reg1, mask_reg2;
aaec0fab
JO		 1445 u32 i;
1446 int show_error = 1;
1447
1448 error_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1STS);
1449 error_reg2 = spider_net_read_reg(card, SPIDER_NET_GHIINT2STS);
7a627558
IK		 1450 mask_reg1 = spider_net_read_reg(card, SPIDER_NET_GHIINT1MSK);
1451 mask_reg2 = spider_net_read_reg(card,SPIDER_NET_GHIINT2MSK);
1452
1453 error_reg1 &= mask_reg1;
1454 error_reg2 &= mask_reg2;
aaec0fab
JO		 1455
1456 /* check GHIINT0STS ************************************/
1457 if (status_reg)
1458 for (i = 0; i < 32; i++)
1459 if (status_reg & (1<<i))
1460 switch (i)
1461 {
1462 /* let error_reg1 and error_reg2 evaluation decide, what to do
1463 case SPIDER_NET_PHYINT:
1464 case SPIDER_NET_GMAC2INT:
1465 case SPIDER_NET_GMAC1INT:
aaec0fab
JO		 1466 case SPIDER_NET_GFIFOINT:
1467 case SPIDER_NET_DMACINT:
1468 case SPIDER_NET_GSYSINT:
1469 break; */
1470
98b9040c
LV		 1471 case SPIDER_NET_GIPSINT:
1472 show_error = 0;
1473 break;
1474
aaec0fab
JO		 1475 case SPIDER_NET_GPWOPCMPINT:
1476 /* PHY write operation completed */
1477 show_error = 0;
1478 break;
1479 case SPIDER_NET_GPROPCMPINT:
1480 /* PHY read operation completed */
1481 /* we don't use semaphores, as we poll for the completion
1482 * of the read operation in spider_net_read_phy. Should take
1483 * about 50 us */
1484 show_error = 0;
1485 break;
1486 case SPIDER_NET_GPWFFINT:
1487 /* PHY command queue full */
1488 if (netif_msg_intr(card))
e6311d85 1489 dev_err(&card->netdev->dev, "PHY write queue full\n");
aaec0fab
JO		 1490 show_error = 0;
1491 break;
1492
1493 /* case SPIDER_NET_GRMDADRINT: not used. print a message */
1494 /* case SPIDER_NET_GRMARPINT: not used. print a message */
1495 /* case SPIDER_NET_GRMMPINT: not used. print a message */
1496
1497 case SPIDER_NET_GDTDEN0INT:
1498 /* someone has set TX_DMA_EN to 0 */
1499 show_error = 0;
1500 break;
1501
1502 case SPIDER_NET_GDDDEN0INT: /* fallthrough */
1503 case SPIDER_NET_GDCDEN0INT: /* fallthrough */
1504 case SPIDER_NET_GDBDEN0INT: /* fallthrough */
1505 case SPIDER_NET_GDADEN0INT:
1506 /* someone has set RX_DMA_EN to 0 */
1507 show_error = 0;
1508 break;
1509
1510 /* RX interrupts */
1511 case SPIDER_NET_GDDFDCINT:
1512 case SPIDER_NET_GDCFDCINT:
1513 case SPIDER_NET_GDBFDCINT:
1514 case SPIDER_NET_GDAFDCINT:
1515 /* case SPIDER_NET_GDNMINT: not used. print a message */
1516 /* case SPIDER_NET_GCNMINT: not used. print a message */
1517 /* case SPIDER_NET_GBNMINT: not used. print a message */
1518 /* case SPIDER_NET_GANMINT: not used. print a message */
1519 /* case SPIDER_NET_GRFNMINT: not used. print a message */
1520 show_error = 0;
1521 break;
1522
1523 /* TX interrupts */
1524 case SPIDER_NET_GDTFDCINT:
1525 show_error = 0;
1526 break;
1527 case SPIDER_NET_GTTEDINT:
1528 show_error = 0;
1529 break;
1530 case SPIDER_NET_GDTDCEINT:
1531 /* chain end. If a descriptor should be sent, kick off
1532 * tx dma
98b9040c 1533 if (card->tx_chain.tail != card->tx_chain.head)
aaec0fab 1534 spider_net_kick_tx_dma(card);
98b9040c
LV		 1535 */
1536 show_error = 0;
aaec0fab
JO		 1537 break;
1538
1539 /* case SPIDER_NET_G1TMCNTINT: not used. print a message */
1540 /* case SPIDER_NET_GFREECNTINT: not used. print a message */
1541 }
1542
1543 /* check GHIINT1STS ************************************/
1544 if (error_reg1)
1545 for (i = 0; i < 32; i++)
1546 if (error_reg1 & (1<<i))
1547 switch (i)
1548 {
1549 case SPIDER_NET_GTMFLLINT:
fc8e13da
IK		 1550 /* TX RAM full may happen on a usual case.
1551 * Logging is not needed. */
aaec0fab
JO		 1552 show_error = 0;
1553 break;
11f1a52b
AB		 1554 case SPIDER_NET_GRFDFLLINT: /* fallthrough */
1555 case SPIDER_NET_GRFCFLLINT: /* fallthrough */
1556 case SPIDER_NET_GRFBFLLINT: /* fallthrough */
1557 case SPIDER_NET_GRFAFLLINT: /* fallthrough */
aaec0fab 1558 case SPIDER_NET_GRMFLLINT:
4c4bd5a9 1559 /* Could happen when rx chain is full */
c3d1182a
LV		 1560 if (card->ignore_rx_ramfull == 0) {
1561 card->ignore_rx_ramfull = 1;
1562 spider_net_resync_head_ptr(card);
1563 spider_net_refill_rx_chain(card);
1564 spider_net_enable_rxdmac(card);
1565 card->num_rx_ints ++;
1566 netif_rx_schedule(card->netdev);
1567 }
11f1a52b 1568 show_error = 0;
aaec0fab
JO		 1569 break;
1570
1571 /* case SPIDER_NET_GTMSHTINT: problem, print a message */
1572 case SPIDER_NET_GDTINVDINT:
1573 /* allrighty. tx from previous descr ok */
1574 show_error = 0;
1575 break;
aaec0fab
JO		 1576
1577 /* chain end */
1578 case SPIDER_NET_GDDDCEINT: /* fallthrough */
1579 case SPIDER_NET_GDCDCEINT: /* fallthrough */
1580 case SPIDER_NET_GDBDCEINT: /* fallthrough */
1581 case SPIDER_NET_GDADCEINT:
4c4bd5a9 1582 spider_net_resync_head_ptr(card);
aaec0fab 1583 spider_net_refill_rx_chain(card);
11f1a52b 1584 spider_net_enable_rxdmac(card);
4c4bd5a9
LV		 1585 card->num_rx_ints ++;
1586 netif_rx_schedule(card->netdev);
aaec0fab
JO		 1587 show_error = 0;
1588 break;
1589
1590 /* invalid descriptor */
1591 case SPIDER_NET_GDDINVDINT: /* fallthrough */
1592 case SPIDER_NET_GDCINVDINT: /* fallthrough */
1593 case SPIDER_NET_GDBINVDINT: /* fallthrough */
1594 case SPIDER_NET_GDAINVDINT:
4c4bd5a9
LV		 1595 /* Could happen when rx chain is full */
1596 spider_net_resync_head_ptr(card);
aaec0fab 1597 spider_net_refill_rx_chain(card);
11f1a52b 1598 spider_net_enable_rxdmac(card);
4c4bd5a9
LV		 1599 card->num_rx_ints ++;
1600 netif_rx_schedule(card->netdev);
aaec0fab
JO		 1601 show_error = 0;
1602 break;
1603
1604 /* case SPIDER_NET_GDTRSERINT: problem, print a message */
1605 /* case SPIDER_NET_GDDRSERINT: problem, print a message */
1606 /* case SPIDER_NET_GDCRSERINT: problem, print a message */
1607 /* case SPIDER_NET_GDBRSERINT: problem, print a message */
1608 /* case SPIDER_NET_GDARSERINT: problem, print a message */
1609 /* case SPIDER_NET_GDSERINT: problem, print a message */
1610 /* case SPIDER_NET_GDTPTERINT: problem, print a message */
1611 /* case SPIDER_NET_GDDPTERINT: problem, print a message */
1612 /* case SPIDER_NET_GDCPTERINT: problem, print a message */
1613 /* case SPIDER_NET_GDBPTERINT: problem, print a message */
1614 /* case SPIDER_NET_GDAPTERINT: problem, print a message */
1615 default:
1616 show_error = 1;
1617 break;
1618 }
1619
1620 /* check GHIINT2STS ************************************/
1621 if (error_reg2)
1622 for (i = 0; i < 32; i++)
1623 if (error_reg2 & (1<<i))
1624 switch (i)
1625 {
1626 /* there is nothing we can (want to) do at this time. Log a
1627 * message, we can switch on and off the specific values later on
1628 case SPIDER_NET_GPROPERINT:
1629 case SPIDER_NET_GMCTCRSNGINT:
1630 case SPIDER_NET_GMCTLCOLINT:
1631 case SPIDER_NET_GMCTTMOTINT:
1632 case SPIDER_NET_GMCRCAERINT:
1633 case SPIDER_NET_GMCRCALERINT:
1634 case SPIDER_NET_GMCRALNERINT:
1635 case SPIDER_NET_GMCROVRINT:
1636 case SPIDER_NET_GMCRRNTINT:
1637 case SPIDER_NET_GMCRRXERINT:
1638 case SPIDER_NET_GTITCSERINT:
1639 case SPIDER_NET_GTIFMTERINT:
1640 case SPIDER_NET_GTIPKTRVKINT:
1641 case SPIDER_NET_GTISPINGINT:
1642 case SPIDER_NET_GTISADNGINT:
1643 case SPIDER_NET_GTISPDNGINT:
1644 case SPIDER_NET_GRIFMTERINT:
1645 case SPIDER_NET_GRIPKTRVKINT:
1646 case SPIDER_NET_GRISPINGINT:
1647 case SPIDER_NET_GRISADNGINT:
1648 case SPIDER_NET_GRISPDNGINT:
1649 break;
1650 */
1651 default:
1652 break;
1653 }
1654
5a028877 1655 if ((show_error) && (netif_msg_intr(card)) && net_ratelimit())
e6311d85 1656 dev_err(&card->netdev->dev, "Error interrupt, GHIINT0STS = 0x%08x, "
aaec0fab
JO		 1657 "GHIINT1STS = 0x%08x, GHIINT2STS = 0x%08x\n",
1658 status_reg, error_reg1, error_reg2);
1659
1660 /* clear interrupt sources */
1661 spider_net_write_reg(card, SPIDER_NET_GHIINT1STS, error_reg1);
1662 spider_net_write_reg(card, SPIDER_NET_GHIINT2STS, error_reg2);
1663}
1664
1665/**
1666 * spider_net_interrupt - interrupt handler for spider_net
1667 * @irq: interupt number
1668 * @ptr: pointer to net_device
1669 * @regs: PU registers
1670 *
1671 * returns IRQ_HANDLED, if interrupt was for driver, or IRQ_NONE, if no
1672 * interrupt found raised by card.
1673 *
1674 * This is the interrupt handler, that turns off
1675 * interrupts for this device and makes the stack poll the driver
1676 */
1677static irqreturn_t
7d12e780 1678spider_net_interrupt(int irq, void *ptr)
aaec0fab
JO		 1679{
1680 struct net_device *netdev = ptr;
1681 struct spider_net_card *card = netdev_priv(netdev);
7a627558 1682 u32 status_reg, mask_reg;
aaec0fab
JO		 1683
1684 status_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0STS);
7a627558
IK		 1685 mask_reg = spider_net_read_reg(card, SPIDER_NET_GHIINT0MSK);
1686 status_reg &= mask_reg;
aaec0fab
JO		 1687
1688 if (!status_reg)
1689 return IRQ_NONE;
1690
aaec0fab
JO		 1691 if (status_reg & SPIDER_NET_RXINT ) {
1692 spider_net_rx_irq_off(card);
1693 netif_rx_schedule(netdev);
4c4bd5a9 1694 card->num_rx_ints ++;
aaec0fab 1695 }
68a8c609
LV		 1696 if (status_reg & SPIDER_NET_TXINT)
1697 netif_rx_schedule(netdev);
aaec0fab 1698
abdb66b5
KI		 1699 if (status_reg & SPIDER_NET_LINKINT)
1700 spider_net_link_reset(netdev);
1701
11f1a52b
AB		 1702 if (status_reg & SPIDER_NET_ERRINT )
1703 spider_net_handle_error_irq(card, status_reg);
aaec0fab
JO		 1704
1705 /* clear interrupt sources */
1706 spider_net_write_reg(card, SPIDER_NET_GHIINT0STS, status_reg);
1707
1708 return IRQ_HANDLED;
1709}
1710
1711#ifdef CONFIG_NET_POLL_CONTROLLER
1712/**
1713 * spider_net_poll_controller - artificial interrupt for netconsole etc.
1714 * @netdev: interface device structure
1715 *
1716 * see Documentation/networking/netconsole.txt
1717 */
1718static void
1719spider_net_poll_controller(struct net_device *netdev)
1720{
1721 disable_irq(netdev->irq);
7d12e780 1722 spider_net_interrupt(netdev->irq, netdev);
aaec0fab
JO		 1723 enable_irq(netdev->irq);
1724}
1725#endif /* CONFIG_NET_POLL_CONTROLLER */
1726
7a627558
IK		 1727/**
1728 * spider_net_enable_interrupts - enable interrupts
1729 * @card: card structure
1730 *
1731 * spider_net_enable_interrupt enables several interrupts
1732 */
1733static void
1734spider_net_enable_interrupts(struct spider_net_card *card)
1735{
1736 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK,
1737 SPIDER_NET_INT0_MASK_VALUE);
1738 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK,
1739 SPIDER_NET_INT1_MASK_VALUE);
1740 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK,
1741 SPIDER_NET_INT2_MASK_VALUE);
1742}
1743
1744/**
1745 * spider_net_disable_interrupts - disable interrupts
1746 * @card: card structure
1747 *
1748 * spider_net_disable_interrupts disables all the interrupts
1749 */
1750static void
1751spider_net_disable_interrupts(struct spider_net_card *card)
1752{
1753 spider_net_write_reg(card, SPIDER_NET_GHIINT0MSK, 0);
1754 spider_net_write_reg(card, SPIDER_NET_GHIINT1MSK, 0);
1755 spider_net_write_reg(card, SPIDER_NET_GHIINT2MSK, 0);
1756 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0);
1757}
1758
aaec0fab
JO		 1759/**
1760 * spider_net_init_card - initializes the card
1761 * @card: card structure
1762 *
1763 * spider_net_init_card initializes the card so that other registers can
1764 * be used
1765 */
1766static void
1767spider_net_init_card(struct spider_net_card *card)
1768{
1769 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1770 SPIDER_NET_CKRCTRL_STOP_VALUE);
1771
1772 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
1773 SPIDER_NET_CKRCTRL_RUN_VALUE);
3342cf0e
KI		 1774
1775 /* trigger ETOMOD signal */
1776 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1777 spider_net_read_reg(card, SPIDER_NET_GMACOPEMD) | 0x4);
1778
7a627558 1779 spider_net_disable_interrupts(card);
aaec0fab
JO		 1780}
1781
1782/**
1783 * spider_net_enable_card - enables the card by setting all kinds of regs
1784 * @card: card structure
1785 *
1786 * spider_net_enable_card sets a lot of SMMIO registers to enable the device
1787 */
1788static void
1789spider_net_enable_card(struct spider_net_card *card)
1790{
1791 int i;
1792 /* the following array consists of (register),(value) pairs
1793 * that are set in this function. A register of 0 ends the list */
1794 u32 regs[][2] = {
1795 { SPIDER_NET_GRESUMINTNUM, 0 },
1796 { SPIDER_NET_GREINTNUM, 0 },
1797
1798 /* set interrupt frame number registers */
1799 /* clear the single DMA engine registers first */
1800 { SPIDER_NET_GFAFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1801 { SPIDER_NET_GFBFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1802 { SPIDER_NET_GFCFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1803 { SPIDER_NET_GFDFRMNUM, SPIDER_NET_GFXFRAMES_VALUE },
1804 /* then set, what we really need */
1805 { SPIDER_NET_GFFRMNUM, SPIDER_NET_FRAMENUM_VALUE },
1806
1807 /* timer counter registers and stuff */
1808 { SPIDER_NET_GFREECNNUM, 0 },
1809 { SPIDER_NET_GONETIMENUM, 0 },
1810 { SPIDER_NET_GTOUTFRMNUM, 0 },
1811
1812 /* RX mode setting */
1813 { SPIDER_NET_GRXMDSET, SPIDER_NET_RXMODE_VALUE },
1814 /* TX mode setting */
1815 { SPIDER_NET_GTXMDSET, SPIDER_NET_TXMODE_VALUE },
1816 /* IPSEC mode setting */
1817 { SPIDER_NET_GIPSECINIT, SPIDER_NET_IPSECINIT_VALUE },
1818
1819 { SPIDER_NET_GFTRESTRT, SPIDER_NET_RESTART_VALUE },
1820
1821 { SPIDER_NET_GMRWOLCTRL, 0 },
b636d17a
JO		 1822 { SPIDER_NET_GTESTMD, 0x10000000 },
1823 { SPIDER_NET_GTTQMSK, 0x00400040 },
aaec0fab
JO		 1824
1825 { SPIDER_NET_GMACINTEN, 0 },
1826
1827 /* flow control stuff */
1828 { SPIDER_NET_GMACAPAUSE, SPIDER_NET_MACAPAUSE_VALUE },
1829 { SPIDER_NET_GMACTXPAUSE, SPIDER_NET_TXPAUSE_VALUE },
1830
1831 { SPIDER_NET_GMACBSTLMT, SPIDER_NET_BURSTLMT_VALUE },
1832 { 0, 0}
1833 };
1834
1835 i = 0;
1836 while (regs[i][0]) {
1837 spider_net_write_reg(card, regs[i][0], regs[i][1]);
1838 i++;
1839 }
1840
1841 /* clear unicast filter table entries 1 to 14 */
1842 for (i = 1; i <= 14; i++) {
1843 spider_net_write_reg(card,
1844 SPIDER_NET_GMRUAFILnR + i * 8,
1845 0x00080000);
1846 spider_net_write_reg(card,
1847 SPIDER_NET_GMRUAFILnR + i * 8 + 4,
1848 0x00000000);
1849 }
1850
1851 spider_net_write_reg(card, SPIDER_NET_GMRUA0FIL15R, 0x08080000);
1852
1853 spider_net_write_reg(card, SPIDER_NET_ECMODE, SPIDER_NET_ECMODE_VALUE);
1854
1855 /* set chain tail adress for RX chains and
1856 * enable DMA */
1857 spider_net_enable_rxchtails(card);
1858 spider_net_enable_rxdmac(card);
1859
1860 spider_net_write_reg(card, SPIDER_NET_GRXDMAEN, SPIDER_NET_WOL_VALUE);
1861
aaec0fab
JO		 1862 spider_net_write_reg(card, SPIDER_NET_GMACLENLMT,
1863 SPIDER_NET_LENLMT_VALUE);
aaec0fab
JO		 1864 spider_net_write_reg(card, SPIDER_NET_GMACOPEMD,
1865 SPIDER_NET_OPMODE_VALUE);
1866
bdd01503 1867 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
7bd54c86 1868 SPIDER_NET_GDTBSTA);
aaec0fab
JO		 1869}
1870
3cf761dd
KI		 1871/**
1872 * spider_net_download_firmware - loads firmware into the adapter
1873 * @card: card structure
1874 * @firmware_ptr: pointer to firmware data
1875 *
1876 * spider_net_download_firmware loads the firmware data into the
1877 * adapter. It assumes the length etc. to be allright.
1878 */
1879static int
1880spider_net_download_firmware(struct spider_net_card *card,
1881 const void *firmware_ptr)
1882{
1883 int sequencer, i;
1884 const u32 *fw_ptr = firmware_ptr;
1885
1886 /* stop sequencers */
1887 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1888 SPIDER_NET_STOP_SEQ_VALUE);
1889
1890 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
1891 sequencer++) {
1892 spider_net_write_reg(card,
1893 SPIDER_NET_GSnPRGADR + sequencer * 8, 0);
1894 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
1895 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
1896 sequencer * 8, *fw_ptr);
1897 fw_ptr++;
1898 }
1899 }
1900
1901 if (spider_net_read_reg(card, SPIDER_NET_GSINIT))
1902 return -EIO;
1903
1904 spider_net_write_reg(card, SPIDER_NET_GSINIT,
1905 SPIDER_NET_RUN_SEQ_VALUE);
1906
1907 return 0;
1908}
1909
1910/**
1911 * spider_net_init_firmware - reads in firmware parts
1912 * @card: card structure
1913 *
1914 * Returns 0 on success, <0 on failure
1915 *
1916 * spider_net_init_firmware opens the sequencer firmware and does some basic
1917 * checks. This function opens and releases the firmware structure. A call
1918 * to download the firmware is performed before the release.
1919 *
1920 * Firmware format
1921 * ===============
1922 * spider_fw.bin is expected to be a file containing 6*1024*4 bytes, 4k being
1923 * the program for each sequencer. Use the command
1924 * tail -q -n +2 Seq_code1_0x088.txt Seq_code2_0x090.txt \
1925 * Seq_code3_0x098.txt Seq_code4_0x0A0.txt Seq_code5_0x0A8.txt \
1926 * Seq_code6_0x0B0.txt | xxd -r -p -c4 > spider_fw.bin
1927 *
1928 * to generate spider_fw.bin, if you have sequencer programs with something
1929 * like the following contents for each sequencer:
1930 * <ONE LINE COMMENT>
1931 * <FIRST 4-BYTES-WORD FOR SEQUENCER>
1932 * <SECOND 4-BYTES-WORD FOR SEQUENCER>
1933 * ...
1934 * <1024th 4-BYTES-WORD FOR SEQUENCER>
1935 */
1936static int
1937spider_net_init_firmware(struct spider_net_card *card)
1938{
1939 struct firmware *firmware = NULL;
1940 struct device_node *dn;
1941 const u8 *fw_prop = NULL;
1942 int err = -ENOENT;
1943 int fw_size;
1944
1945 if (request_firmware((const struct firmware **)&firmware,
1946 SPIDER_NET_FIRMWARE_NAME, &card->pdev->dev) == 0) {
1947 if ( (firmware->size != SPIDER_NET_FIRMWARE_LEN) &&
1948 netif_msg_probe(card) ) {
e6311d85
LV		 1949 dev_err(&card->netdev->dev,
1950 "Incorrect size of spidernet firmware in " \
3cf761dd
KI		 1951 "filesystem. Looking in host firmware...\n");
1952 goto try_host_fw;
1953 }
1954 err = spider_net_download_firmware(card, firmware->data);
1955
1956 release_firmware(firmware);
1957 if (err)
1958 goto try_host_fw;
1959
1960 goto done;
1961 }
1962
1963try_host_fw:
1964 dn = pci_device_to_OF_node(card->pdev);
1965 if (!dn)
1966 goto out_err;
1967
40cd3a45 1968 fw_prop = of_get_property(dn, "firmware", &fw_size);
3cf761dd
KI		 1969 if (!fw_prop)
1970 goto out_err;
1971
1972 if ( (fw_size != SPIDER_NET_FIRMWARE_LEN) &&
1973 netif_msg_probe(card) ) {
e6311d85
LV		 1974 dev_err(&card->netdev->dev,
1975 "Incorrect size of spidernet firmware in host firmware\n");
3cf761dd
KI		 1976 goto done;
1977 }
1978
1979 err = spider_net_download_firmware(card, fw_prop);
1980
1981done:
1982 return err;
1983out_err:
1984 if (netif_msg_probe(card))
e6311d85
LV		 1985 dev_err(&card->netdev->dev,
1986 "Couldn't find spidernet firmware in filesystem " \
3cf761dd
KI		 1987 "or host firmware\n");
1988 return err;
1989}
1990
aaec0fab
JO		 1991/**
1992 * spider_net_open - called upon ifonfig up
1993 * @netdev: interface device structure
1994 *
1995 * returns 0 on success, <0 on failure
1996 *
1997 * spider_net_open allocates all the descriptors and memory needed for
1998 * operation, sets up multicast list and enables interrupts
1999 */
2000int
2001spider_net_open(struct net_device *netdev)
2002{
2003 struct spider_net_card *card = netdev_priv(netdev);
d4ed8f8d 2004 int result;
aaec0fab 2005
3cf761dd
KI		 2006 result = spider_net_init_firmware(card);
2007 if (result)
2008 goto init_firmware_failed;
2009
abdb66b5
KI		 2010 /* start probing with copper */
2011 spider_net_setup_aneg(card);
2012 if (card->phy.def->phy_id)
2013 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2014
d4ed8f8d
LV		 2015 result = spider_net_init_chain(card, &card->tx_chain);
2016 if (result)
aaec0fab 2017 goto alloc_tx_failed;
204e5fa1
LV		 2018 card->low_watermark = NULL;
2019
d4ed8f8d
LV		 2020 result = spider_net_init_chain(card, &card->rx_chain);
2021 if (result)
aaec0fab
JO		 2022 goto alloc_rx_failed;
2023
d4ed8f8d 2024 /* Allocate rx skbs */
aaec0fab
JO		 2025 if (spider_net_alloc_rx_skbs(card))
2026 goto alloc_skbs_failed;
2027
2028 spider_net_set_multi(netdev);
2029
2030 /* further enhancement: setup hw vlan, if needed */
2031
2032 result = -EBUSY;
2033 if (request_irq(netdev->irq, spider_net_interrupt,
1fb9df5d 2034 IRQF_SHARED, netdev->name, netdev))
aaec0fab
JO		 2035 goto register_int_failed;
2036
2037 spider_net_enable_card(card);
2038
543cec51
JO		 2039 netif_start_queue(netdev);
2040 netif_carrier_on(netdev);
2041 netif_poll_enable(netdev);
2042
7a627558
IK		 2043 spider_net_enable_interrupts(card);
2044
aaec0fab
JO		 2045 return 0;
2046
2047register_int_failed:
2048 spider_net_free_rx_chain_contents(card);
2049alloc_skbs_failed:
2050 spider_net_free_chain(card, &card->rx_chain);
2051alloc_rx_failed:
2052 spider_net_free_chain(card, &card->tx_chain);
2053alloc_tx_failed:
abdb66b5 2054 del_timer_sync(&card->aneg_timer);
3cf761dd 2055init_firmware_failed:
aaec0fab
JO		 2056 return result;
2057}
2058
abdb66b5
KI		 2059/**
2060 * spider_net_link_phy
2061 * @data: used for pointer to card structure
2062 *
2063 */
2064static void spider_net_link_phy(unsigned long data)
2065{
2066 struct spider_net_card *card = (struct spider_net_card *)data;
2067 struct mii_phy *phy = &card->phy;
2068
2069 /* if link didn't come up after SPIDER_NET_ANEG_TIMEOUT tries, setup phy again */
2070 if (card->aneg_count > SPIDER_NET_ANEG_TIMEOUT) {
2071
2072 pr_info("%s: link is down trying to bring it up\n", card->netdev->name);
2073
4b23a554
JO		 2074 switch (card->medium) {
2075 case BCM54XX_COPPER:
abdb66b5
KI		 2076 /* enable fiber with autonegotiation first */
2077 if (phy->def->ops->enable_fiber)
2078 phy->def->ops->enable_fiber(phy, 1);
4b23a554 2079 card->medium = BCM54XX_FIBER;
abdb66b5
KI		 2080 break;
2081
4b23a554 2082 case BCM54XX_FIBER:
abdb66b5
KI		 2083 /* fiber didn't come up, try to disable fiber autoneg */
2084 if (phy->def->ops->enable_fiber)
2085 phy->def->ops->enable_fiber(phy, 0);
4b23a554 2086 card->medium = BCM54XX_UNKNOWN;
abdb66b5
KI		 2087 break;
2088
4b23a554 2089 case BCM54XX_UNKNOWN:
abdb66b5
KI		 2090 /* copper, fiber with and without failed,
2091 * retry from beginning */
2092 spider_net_setup_aneg(card);
4b23a554 2093 card->medium = BCM54XX_COPPER;
abdb66b5
KI		 2094 break;
2095 }
2096
2097 card->aneg_count = 0;
2098 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2099 return;
2100 }
2101
2102 /* link still not up, try again later */
2103 if (!(phy->def->ops->poll_link(phy))) {
2104 card->aneg_count++;
2105 mod_timer(&card->aneg_timer, jiffies + SPIDER_NET_ANEG_TIMER);
2106 return;
2107 }
2108
2109 /* link came up, get abilities */
2110 phy->def->ops->read_link(phy);
2111
2112 spider_net_write_reg(card, SPIDER_NET_GMACST,
2113 spider_net_read_reg(card, SPIDER_NET_GMACST));
2114 spider_net_write_reg(card, SPIDER_NET_GMACINTEN, 0x4);
2115
2116 if (phy->speed == 1000)
2117 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0x00000001);
2118 else
2119 spider_net_write_reg(card, SPIDER_NET_GMACMODE, 0);
2120
2121 card->aneg_count = 0;
2122
2123 pr_debug("Found %s with %i Mbps, %s-duplex %sautoneg.\n",
2124 phy->def->name, phy->speed, phy->duplex==1 ? "Full" : "Half",
2125 phy->autoneg==1 ? "" : "no ");
2126
2127 return;
2128}
2129
aaec0fab
JO		 2130/**
2131 * spider_net_setup_phy - setup PHY
2132 * @card: card structure
2133 *
2134 * returns 0 on success, <0 on failure
2135 *
abdb66b5 2136 * spider_net_setup_phy is used as part of spider_net_probe.
aaec0fab
JO		 2137 **/
2138static int
2139spider_net_setup_phy(struct spider_net_card *card)
2140{
2141 struct mii_phy *phy = &card->phy;
2142
2143 spider_net_write_reg(card, SPIDER_NET_GDTDMASEL,
2144 SPIDER_NET_DMASEL_VALUE);
2145 spider_net_write_reg(card, SPIDER_NET_GPCCTRL,
2146 SPIDER_NET_PHY_CTRL_VALUE);
abdb66b5 2147
aaec0fab
JO		 2148 phy->dev = card->netdev;
2149 phy->mdio_read = spider_net_read_phy;
2150 phy->mdio_write = spider_net_write_phy;
2151
abdb66b5
KI		 2152 for (phy->mii_id = 1; phy->mii_id <= 31; phy->mii_id++) {
2153 unsigned short id;
2154 id = spider_net_read_phy(card->netdev, phy->mii_id, MII_BMSR);
2155 if (id != 0x0000 && id != 0xffff) {
2156 if (!mii_phy_probe(phy, phy->mii_id)) {
2157 pr_info("Found %s.\n", phy->def->name);
2158 break;
2159 }
2160 }
2161 }
aaec0fab
JO		 2162
2163 return 0;
2164}
2165
aaec0fab
JO		 2166/**
2167 * spider_net_workaround_rxramfull - work around firmware bug
2168 * @card: card structure
2169 *
2170 * no return value
2171 **/
2172static void
2173spider_net_workaround_rxramfull(struct spider_net_card *card)
2174{
2175 int i, sequencer = 0;
2176
2177 /* cancel reset */
2178 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2179 SPIDER_NET_CKRCTRL_RUN_VALUE);
2180
2181 /* empty sequencer data */
11f1a52b
AB		 2182 for (sequencer = 0; sequencer < SPIDER_NET_FIRMWARE_SEQS;
2183 sequencer++) {
ee962a5c 2184 spider_net_write_reg(card, SPIDER_NET_GSnPRGADR +
aaec0fab 2185 sequencer * 8, 0x0);
11f1a52b 2186 for (i = 0; i < SPIDER_NET_FIRMWARE_SEQWORDS; i++) {
aaec0fab
JO		 2187 spider_net_write_reg(card, SPIDER_NET_GSnPRGDAT +
2188 sequencer * 8, 0x0);
2189 }
2190 }
2191
2192 /* set sequencer operation */
2193 spider_net_write_reg(card, SPIDER_NET_GSINIT, 0x000000fe);
2194
2195 /* reset */
2196 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2197 SPIDER_NET_CKRCTRL_STOP_VALUE);
2198}
2199
bdd01503
JO		 2200/**
2201 * spider_net_stop - called upon ifconfig down
2202 * @netdev: interface device structure
2203 *
2204 * always returns 0
2205 */
2206int
2207spider_net_stop(struct net_device *netdev)
2208{
2209 struct spider_net_card *card = netdev_priv(netdev);
2210
bdd01503
JO		 2211 netif_poll_disable(netdev);
2212 netif_carrier_off(netdev);
2213 netif_stop_queue(netdev);
2214 del_timer_sync(&card->tx_timer);
abdb66b5 2215 del_timer_sync(&card->aneg_timer);
bdd01503 2216
7a627558 2217 spider_net_disable_interrupts(card);
bdd01503 2218
d406eafe 2219 free_irq(netdev->irq, netdev);
bdd01503
JO		 2220
2221 spider_net_write_reg(card, SPIDER_NET_GDTDMACCNTR,
2222 SPIDER_NET_DMA_TX_FEND_VALUE);
2223
2224 /* turn off DMA, force end */
2225 spider_net_disable_rxdmac(card);
2226
2227 /* release chains */
9cc7bf7e 2228 spider_net_release_tx_chain(card, 1);
d4ed8f8d 2229 spider_net_free_rx_chain_contents(card);
bdd01503
JO		 2230
2231 spider_net_free_chain(card, &card->tx_chain);
2232 spider_net_free_chain(card, &card->rx_chain);
2233
2234 return 0;
2235}
2236
aaec0fab
JO		 2237/**
2238 * spider_net_tx_timeout_task - task scheduled by the watchdog timeout
2239 * function (to be called not under interrupt status)
2240 * @data: data, is interface device structure
2241 *
2242 * called as task when tx hangs, resets interface (if interface is up)
2243 */
2244static void
c4028958 2245spider_net_tx_timeout_task(struct work_struct *work)
aaec0fab 2246{
c4028958
DH		 2247 struct spider_net_card *card =
2248 container_of(work, struct spider_net_card, tx_timeout_task);
2249 struct net_device *netdev = card->netdev;
aaec0fab
JO		 2250
2251 if (!(netdev->flags & IFF_UP))
2252 goto out;
2253
2254 netif_device_detach(netdev);
2255 spider_net_stop(netdev);
2256
2257 spider_net_workaround_rxramfull(card);
2258 spider_net_init_card(card);
2259
2260 if (spider_net_setup_phy(card))
2261 goto out;
aaec0fab
JO		 2262
2263 spider_net_open(netdev);
bdd01503 2264 spider_net_kick_tx_dma(card);
aaec0fab
JO		 2265 netif_device_attach(netdev);
2266
2267out:
2268 atomic_dec(&card->tx_timeout_task_counter);
2269}
2270
2271/**
2272 * spider_net_tx_timeout - called when the tx timeout watchdog kicks in.
2273 * @netdev: interface device structure
2274 *
2275 * called, if tx hangs. Schedules a task that resets the interface
2276 */
2277static void
2278spider_net_tx_timeout(struct net_device *netdev)
2279{
2280 struct spider_net_card *card;
2281
2282 card = netdev_priv(netdev);
2283 atomic_inc(&card->tx_timeout_task_counter);
2284 if (netdev->flags & IFF_UP)
2285 schedule_work(&card->tx_timeout_task);
2286 else
2287 atomic_dec(&card->tx_timeout_task_counter);
9b6b0b81 2288 card->spider_stats.tx_timeouts++;
aaec0fab
JO		 2289}
2290
2291/**
2292 * spider_net_setup_netdev_ops - initialization of net_device operations
2293 * @netdev: net_device structure
2294 *
2295 * fills out function pointers in the net_device structure
2296 */
2297static void
2298spider_net_setup_netdev_ops(struct net_device *netdev)
2299{
2300 netdev->open = &spider_net_open;
2301 netdev->stop = &spider_net_stop;
2302 netdev->hard_start_xmit = &spider_net_xmit;
2303 netdev->get_stats = &spider_net_get_stats;
2304 netdev->set_multicast_list = &spider_net_set_multi;
2305 netdev->set_mac_address = &spider_net_set_mac;
2306 netdev->change_mtu = &spider_net_change_mtu;
2307 netdev->do_ioctl = &spider_net_do_ioctl;
2308 /* tx watchdog */
2309 netdev->tx_timeout = &spider_net_tx_timeout;
2310 netdev->watchdog_timeo = SPIDER_NET_WATCHDOG_TIMEOUT;
2311 /* NAPI */
2312 netdev->poll = &spider_net_poll;
2313 netdev->weight = SPIDER_NET_NAPI_WEIGHT;
2314 /* HW VLAN */
aaec0fab
JO		 2315#ifdef CONFIG_NET_POLL_CONTROLLER
2316 /* poll controller */
2317 netdev->poll_controller = &spider_net_poll_controller;
2318#endif /* CONFIG_NET_POLL_CONTROLLER */
2319 /* ethtool ops */
2320 netdev->ethtool_ops = &spider_net_ethtool_ops;
2321}
2322
2323/**
2324 * spider_net_setup_netdev - initialization of net_device
2325 * @card: card structure
2326 *
2327 * Returns 0 on success or <0 on failure
2328 *
2329 * spider_net_setup_netdev initializes the net_device structure
2330 **/
2331static int
2332spider_net_setup_netdev(struct spider_net_card *card)
2333{
2334 int result;
2335 struct net_device *netdev = card->netdev;
2336 struct device_node *dn;
2337 struct sockaddr addr;
1a2509c9 2338 const u8 *mac;
aaec0fab
JO		 2339
2340 SET_MODULE_OWNER(netdev);
2341 SET_NETDEV_DEV(netdev, &card->pdev->dev);
2342
2343 pci_set_drvdata(card->pdev, netdev);
11f1a52b 2344
11f1a52b
AB		 2345 init_timer(&card->tx_timer);
2346 card->tx_timer.function =
2347 (void (*)(unsigned long)) spider_net_cleanup_tx_ring;
2348 card->tx_timer.data = (unsigned long) card;
aaec0fab
JO		 2349 netdev->irq = card->pdev->irq;
2350
abdb66b5
KI		 2351 card->aneg_count = 0;
2352 init_timer(&card->aneg_timer);
2353 card->aneg_timer.function = spider_net_link_phy;
2354 card->aneg_timer.data = (unsigned long) card;
2355
aaec0fab
JO		 2356 card->options.rx_csum = SPIDER_NET_RX_CSUM_DEFAULT;
2357
2358 spider_net_setup_netdev_ops(netdev);
2359
3a2c892d 2360 netdev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX;
aaec0fab
JO		 2361 /* some time: NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
2362 * NETIF_F_HW_VLAN_FILTER */
2363
2364 netdev->irq = card->pdev->irq;
4c4bd5a9 2365 card->num_rx_ints = 0;
c3d1182a 2366 card->ignore_rx_ramfull = 0;
aaec0fab
JO		 2367
2368 dn = pci_device_to_OF_node(card->pdev);
543cec51
JO		 2369 if (!dn)
2370 return -EIO;
2371
40cd3a45 2372 mac = of_get_property(dn, "local-mac-address", NULL);
543cec51
JO		 2373 if (!mac)
2374 return -EIO;
aaec0fab
JO		 2375 memcpy(addr.sa_data, mac, ETH_ALEN);
2376
2377 result = spider_net_set_mac(netdev, &addr);
2378 if ((result) && (netif_msg_probe(card)))
e6311d85
LV		 2379 dev_err(&card->netdev->dev,
2380 "Failed to set MAC address: %i\n", result);
aaec0fab
JO		 2381
2382 result = register_netdev(netdev);
2383 if (result) {
2384 if (netif_msg_probe(card))
e6311d85
LV		 2385 dev_err(&card->netdev->dev,
2386 "Couldn't register net_device: %i\n", result);
aaec0fab
JO		 2387 return result;
2388 }
2389
2390 if (netif_msg_probe(card))
2391 pr_info("Initialized device %s.\n", netdev->name);
2392
2393 return 0;
2394}
2395
2396/**
2397 * spider_net_alloc_card - allocates net_device and card structure
2398 *
2399 * returns the card structure or NULL in case of errors
2400 *
2401 * the card and net_device structures are linked to each other
2402 */
2403static struct spider_net_card *
2404spider_net_alloc_card(void)
2405{
2406 struct net_device *netdev;
2407 struct spider_net_card *card;
4cb6f9e5 2408 size_t alloc_size;
aaec0fab 2409
4cb6f9e5
LV		 2410 alloc_size = sizeof(struct spider_net_card) +
2411 (tx_descriptors + rx_descriptors) * sizeof(struct spider_net_descr);
2412 netdev = alloc_etherdev(alloc_size);
aaec0fab
JO		 2413 if (!netdev)
2414 return NULL;
2415
2416 card = netdev_priv(netdev);
2417 card->netdev = netdev;
2418 card->msg_enable = SPIDER_NET_DEFAULT_MSG;
c4028958 2419 INIT_WORK(&card->tx_timeout_task, spider_net_tx_timeout_task);
aaec0fab
JO		 2420 init_waitqueue_head(&card->waitq);
2421 atomic_set(&card->tx_timeout_task_counter, 0);
2422
4cb6f9e5
LV		 2423 card->rx_chain.num_desc = rx_descriptors;
2424 card->rx_chain.ring = card->darray;
2425 card->tx_chain.num_desc = tx_descriptors;
2426 card->tx_chain.ring = card->darray + rx_descriptors;
2427
aaec0fab
JO		 2428 return card;
2429}
2430
2431/**
2432 * spider_net_undo_pci_setup - releases PCI ressources
2433 * @card: card structure
2434 *
2435 * spider_net_undo_pci_setup releases the mapped regions
2436 */
2437static void
2438spider_net_undo_pci_setup(struct spider_net_card *card)
2439{
2440 iounmap(card->regs);
2441 pci_release_regions(card->pdev);
2442}
2443
2444/**
2445 * spider_net_setup_pci_dev - sets up the device in terms of PCI operations
2446 * @card: card structure
2447 * @pdev: PCI device
2448 *
2449 * Returns the card structure or NULL if any errors occur
2450 *
2451 * spider_net_setup_pci_dev initializes pdev and together with the
2452 * functions called in spider_net_open configures the device so that
2453 * data can be transferred over it
2454 * The net_device structure is attached to the card structure, if the
2455 * function returns without error.
2456 **/
2457static struct spider_net_card *
2458spider_net_setup_pci_dev(struct pci_dev *pdev)
2459{
2460 struct spider_net_card *card;
2461 unsigned long mmio_start, mmio_len;
2462
2463 if (pci_enable_device(pdev)) {
e6311d85 2464 dev_err(&pdev->dev, "Couldn't enable PCI device\n");
aaec0fab
JO		 2465 return NULL;
2466 }
2467
2468 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
e6311d85
LV		 2469 dev_err(&pdev->dev,
2470 "Couldn't find proper PCI device base address.\n");
aaec0fab
JO		 2471 goto out_disable_dev;
2472 }
2473
2474 if (pci_request_regions(pdev, spider_net_driver_name)) {
e6311d85
LV		 2475 dev_err(&pdev->dev,
2476 "Couldn't obtain PCI resources, aborting.\n");
aaec0fab
JO		 2477 goto out_disable_dev;
2478 }
2479
2480 pci_set_master(pdev);
2481
2482 card = spider_net_alloc_card();
2483 if (!card) {
e6311d85
LV		 2484 dev_err(&pdev->dev,
2485 "Couldn't allocate net_device structure, aborting.\n");
aaec0fab
JO		 2486 goto out_release_regions;
2487 }
2488 card->pdev = pdev;
2489
2490 /* fetch base address and length of first resource */
2491 mmio_start = pci_resource_start(pdev, 0);
2492 mmio_len = pci_resource_len(pdev, 0);
2493
2494 card->netdev->mem_start = mmio_start;
2495 card->netdev->mem_end = mmio_start + mmio_len;
2496 card->regs = ioremap(mmio_start, mmio_len);
2497
2498 if (!card->regs) {
e6311d85
LV		 2499 dev_err(&pdev->dev,
2500 "Couldn't obtain PCI resources, aborting.\n");
aaec0fab
JO		 2501 goto out_release_regions;
2502 }
2503
2504 return card;
2505
2506out_release_regions:
2507 pci_release_regions(pdev);
2508out_disable_dev:
2509 pci_disable_device(pdev);
2510 pci_set_drvdata(pdev, NULL);
2511 return NULL;
2512}
2513
2514/**
2515 * spider_net_probe - initialization of a device
2516 * @pdev: PCI device
2517 * @ent: entry in the device id list
2518 *
2519 * Returns 0 on success, <0 on failure
2520 *
2521 * spider_net_probe initializes pdev and registers a net_device
2522 * structure for it. After that, the device can be ifconfig'ed up
2523 **/
2524static int __devinit
2525spider_net_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2526{
2527 int err = -EIO;
2528 struct spider_net_card *card;
2529
2530 card = spider_net_setup_pci_dev(pdev);
2531 if (!card)
2532 goto out;
2533
2534 spider_net_workaround_rxramfull(card);
2535 spider_net_init_card(card);
2536
2537 err = spider_net_setup_phy(card);
2538 if (err)
2539 goto out_undo_pci;
2540
aaec0fab
JO		 2541 err = spider_net_setup_netdev(card);
2542 if (err)
2543 goto out_undo_pci;
2544
2545 return 0;
2546
2547out_undo_pci:
2548 spider_net_undo_pci_setup(card);
2549 free_netdev(card->netdev);
2550out:
2551 return err;
2552}
2553
2554/**
2555 * spider_net_remove - removal of a device
2556 * @pdev: PCI device
2557 *
2558 * Returns 0 on success, <0 on failure
2559 *
2560 * spider_net_remove is called to remove the device and unregisters the
2561 * net_device
2562 **/
2563static void __devexit
2564spider_net_remove(struct pci_dev *pdev)
2565{
2566 struct net_device *netdev;
2567 struct spider_net_card *card;
2568
2569 netdev = pci_get_drvdata(pdev);
2570 card = netdev_priv(netdev);
2571
2572 wait_event(card->waitq,
2573 atomic_read(&card->tx_timeout_task_counter) == 0);
2574
2575 unregister_netdev(netdev);
543cec51
JO		 2576
2577 /* switch off card */
2578 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2579 SPIDER_NET_CKRCTRL_STOP_VALUE);
2580 spider_net_write_reg(card, SPIDER_NET_CKRCTRL,
2581 SPIDER_NET_CKRCTRL_RUN_VALUE);
2582
aaec0fab
JO		 2583 spider_net_undo_pci_setup(card);
2584 free_netdev(netdev);
aaec0fab
JO		 2585}
2586
2587static struct pci_driver spider_net_driver = {
aaec0fab
JO		 2588 .name = spider_net_driver_name,
2589 .id_table = spider_net_pci_tbl,
2590 .probe = spider_net_probe,
2591 .remove = __devexit_p(spider_net_remove)
2592};
2593
2594/**
2595 * spider_net_init - init function when the driver is loaded
2596 *
2597 * spider_net_init registers the device driver
2598 */
2599static int __init spider_net_init(void)
2600{
90f10841
LV		 2601 printk(KERN_INFO "Spidernet version %s.\n", VERSION);
2602
aaec0fab
JO		 2603 if (rx_descriptors < SPIDER_NET_RX_DESCRIPTORS_MIN) {
2604 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MIN;
2605 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2606 }
2607 if (rx_descriptors > SPIDER_NET_RX_DESCRIPTORS_MAX) {
2608 rx_descriptors = SPIDER_NET_RX_DESCRIPTORS_MAX;
2609 pr_info("adjusting rx descriptors to %i.\n", rx_descriptors);
2610 }
2611 if (tx_descriptors < SPIDER_NET_TX_DESCRIPTORS_MIN) {
2612 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MIN;
2613 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2614 }
2615 if (tx_descriptors > SPIDER_NET_TX_DESCRIPTORS_MAX) {
2616 tx_descriptors = SPIDER_NET_TX_DESCRIPTORS_MAX;
2617 pr_info("adjusting tx descriptors to %i.\n", tx_descriptors);
2618 }
2619
2620 return pci_register_driver(&spider_net_driver);
2621}
2622
2623/**
2624 * spider_net_cleanup - exit function when driver is unloaded
2625 *
2626 * spider_net_cleanup unregisters the device driver
2627 */
2628static void __exit spider_net_cleanup(void)
2629{
2630 pci_unregister_driver(&spider_net_driver);
2631}
2632
2633module_init(spider_net_init);
2634module_exit(spider_net_cleanup);
Linux 6.x block layer and io_uring tree(s)