?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ip: fix truesize mismatch in ip fragmentation
[linux/fpc-iii.git] / drivers / net / cassini.c
blob04a03f7003a0d9e0e0d2bf0d852c90f253fcaa56
1 /* cassini.c: Sun Microsystems Cassini(+) ethernet driver.
2 *
3 * Copyright (C) 2004 Sun Microsystems Inc.
4 * Copyright (C) 2003 Adrian Sun (asun@darksunrising.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
19 * 02111-1307, USA.
20 *
21 * This driver uses the sungem driver (c) David Miller
22 * (davem@redhat.com) as its basis.
23 *
24 * The cassini chip has a number of features that distinguish it from
25 * the gem chip:
26 * 4 transmit descriptor rings that are used for either QoS (VLAN) or
27 * load balancing (non-VLAN mode)
28 * batching of multiple packets
29 * multiple CPU dispatching
30 * page-based RX descriptor engine with separate completion rings
31 * Gigabit support (GMII and PCS interface)
32 * MIF link up/down detection works
33 *
34 * RX is handled by page sized buffers that are attached as fragments to
35 * the skb. here's what's done:
36 * -- driver allocates pages at a time and keeps reference counts
37 * on them.
38 * -- the upper protocol layers assume that the header is in the skb
39 * itself. as a result, cassini will copy a small amount (64 bytes)
40 * to make them happy.
41 * -- driver appends the rest of the data pages as frags to skbuffs
42 * and increments the reference count
43 * -- on page reclamation, the driver swaps the page with a spare page.
44 * if that page is still in use, it frees its reference to that page,
45 * and allocates a new page for use. otherwise, it just recycles the
46 * the page.
47 *
48 * NOTE: cassini can parse the header. however, it's not worth it
49 * as long as the network stack requires a header copy.
50 *
51 * TX has 4 queues. currently these queues are used in a round-robin
52 * fashion for load balancing. They can also be used for QoS. for that
53 * to work, however, QoS information needs to be exposed down to the driver
54 * level so that subqueues get targetted to particular transmit rings.
55 * alternatively, the queues can be configured via use of the all-purpose
56 * ioctl.
57 *
58 * RX DATA: the rx completion ring has all the info, but the rx desc
59 * ring has all of the data. RX can conceivably come in under multiple
60 * interrupts, but the INT# assignment needs to be set up properly by
61 * the BIOS and conveyed to the driver. PCI BIOSes don't know how to do
62 * that. also, the two descriptor rings are designed to distinguish between
63 * encrypted and non-encrypted packets, but we use them for buffering
64 * instead.
65 *
66 * by default, the selective clear mask is set up to process rx packets.
67 */
68
69 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
70
71 #include <linux/module.h>
72 #include <linux/kernel.h>
73 #include <linux/types.h>
74 #include <linux/compiler.h>
75 #include <linux/slab.h>
76 #include <linux/delay.h>
77 #include <linux/init.h>
78 #include <linux/vmalloc.h>
79 #include <linux/ioport.h>
80 #include <linux/pci.h>
81 #include <linux/mm.h>
82 #include <linux/highmem.h>
83 #include <linux/list.h>
84 #include <linux/dma-mapping.h>
85
86 #include <linux/netdevice.h>
87 #include <linux/etherdevice.h>
88 #include <linux/skbuff.h>
89 #include <linux/ethtool.h>
90 #include <linux/crc32.h>
91 #include <linux/random.h>
92 #include <linux/mii.h>
93 #include <linux/ip.h>
94 #include <linux/tcp.h>
95 #include <linux/mutex.h>
96 #include <linux/firmware.h>
97
98 #include <net/checksum.h>
99
100 #include <asm/atomic.h>
101 #include <asm/system.h>
102 #include <asm/io.h>
103 #include <asm/byteorder.h>
104 #include <asm/uaccess.h>
105
106 #define cas_page_map(x) kmap_atomic((x), KM_SKB_DATA_SOFTIRQ)
107 #define cas_page_unmap(x) kunmap_atomic((x), KM_SKB_DATA_SOFTIRQ)
108 #define CAS_NCPUS num_online_cpus()
109
110 #ifdef CONFIG_CASSINI_NAPI
111 #define USE_NAPI
112 #define cas_skb_release(x) netif_receive_skb(x)
113 #else
114 #define cas_skb_release(x) netif_rx(x)
115 #endif
116
117 /* select which firmware to use */
118 #define USE_HP_WORKAROUND
119 #define HP_WORKAROUND_DEFAULT /* select which firmware to use as default */
120 #define CAS_HP_ALT_FIRMWARE cas_prog_null /* alternate firmware */
121
122 #include "cassini.h"
123
124 #define USE_TX_COMPWB /* use completion writeback registers */
125 #define USE_CSMA_CD_PROTO /* standard CSMA/CD */
126 #define USE_RX_BLANK /* hw interrupt mitigation */
127 #undef USE_ENTROPY_DEV /* don't test for entropy device */
128
129 /* NOTE: these aren't useable unless PCI interrupts can be assigned.
130 * also, we need to make cp->lock finer-grained.
131 */
132 #undef USE_PCI_INTB
133 #undef USE_PCI_INTC
134 #undef USE_PCI_INTD
135 #undef USE_QOS
136
137 #undef USE_VPD_DEBUG /* debug vpd information if defined */
138
139 /* rx processing options */
140 #define USE_PAGE_ORDER /* specify to allocate large rx pages */
141 #define RX_DONT_BATCH 0 /* if 1, don't batch flows */
142 #define RX_COPY_ALWAYS 0 /* if 0, use frags */
143 #define RX_COPY_MIN 64 /* copy a little to make upper layers happy */
144 #undef RX_COUNT_BUFFERS /* define to calculate RX buffer stats */
145
146 #define DRV_MODULE_NAME "cassini"
147 #define DRV_MODULE_VERSION "1.6"
148 #define DRV_MODULE_RELDATE "21 May 2008"
149
150 #define CAS_DEF_MSG_ENABLE \
151 (NETIF_MSG_DRV | \
152 NETIF_MSG_PROBE | \
153 NETIF_MSG_LINK | \
154 NETIF_MSG_TIMER | \
155 NETIF_MSG_IFDOWN | \
156 NETIF_MSG_IFUP | \
157 NETIF_MSG_RX_ERR | \
158 NETIF_MSG_TX_ERR)
159
160 /* length of time before we decide the hardware is borked,
161 * and dev->tx_timeout() should be called to fix the problem
162 */
163 #define CAS_TX_TIMEOUT (HZ)
164 #define CAS_LINK_TIMEOUT (22*HZ/10)
165 #define CAS_LINK_FAST_TIMEOUT (1)
166
167 /* timeout values for state changing. these specify the number
168 * of 10us delays to be used before giving up.
169 */
170 #define STOP_TRIES_PHY 1000
171 #define STOP_TRIES 5000
172
173 /* specify a minimum frame size to deal with some fifo issues
174 * max mtu == 2 * page size - ethernet header - 64 - swivel =
175 * 2 * page_size - 0x50
176 */
177 #define CAS_MIN_FRAME 97
178 #define CAS_1000MB_MIN_FRAME 255
179 #define CAS_MIN_MTU 60
180 #define CAS_MAX_MTU min(((cp->page_size << 1) - 0x50), 9000)
181
182 #if 1
183 /*
184 * Eliminate these and use separate atomic counters for each, to
185 * avoid a race condition.
186 */
187 #else
188 #define CAS_RESET_MTU 1
189 #define CAS_RESET_ALL 2
190 #define CAS_RESET_SPARE 3
191 #endif
192
193 static char version[] __devinitdata =
194 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
195
196 static int cassini_debug = -1; /* -1 == use CAS_DEF_MSG_ENABLE as value */
197 static int link_mode;
198
199 MODULE_AUTHOR("Adrian Sun (asun@darksunrising.com)");
200 MODULE_DESCRIPTION("Sun Cassini(+) ethernet driver");
201 MODULE_LICENSE("GPL");
202 MODULE_FIRMWARE("sun/cassini.bin");
203 module_param(cassini_debug, int, 0);
204 MODULE_PARM_DESC(cassini_debug, "Cassini bitmapped debugging message enable value");
205 module_param(link_mode, int, 0);
206 MODULE_PARM_DESC(link_mode, "default link mode");
207
208 /*
209 * Work around for a PCS bug in which the link goes down due to the chip
210 * being confused and never showing a link status of "up."
211 */
212 #define DEFAULT_LINKDOWN_TIMEOUT 5
213 /*
214 * Value in seconds, for user input.
215 */
216 static int linkdown_timeout = DEFAULT_LINKDOWN_TIMEOUT;
217 module_param(linkdown_timeout, int, 0);
218 MODULE_PARM_DESC(linkdown_timeout,
219 "min reset interval in sec. for PCS linkdown issue; disabled if not positive");
220
221 /*
222 * value in 'ticks' (units used by jiffies). Set when we init the
223 * module because 'HZ' in actually a function call on some flavors of
224 * Linux. This will default to DEFAULT_LINKDOWN_TIMEOUT * HZ.
225 */
226 static int link_transition_timeout;
227
228
229
230 static u16 link_modes[] __devinitdata = {
231 BMCR_ANENABLE, /* 0 : autoneg */
232 0, /* 1 : 10bt half duplex */
233 BMCR_SPEED100, /* 2 : 100bt half duplex */
234 BMCR_FULLDPLX, /* 3 : 10bt full duplex */
235 BMCR_SPEED100|BMCR_FULLDPLX, /* 4 : 100bt full duplex */
236 CAS_BMCR_SPEED1000|BMCR_FULLDPLX /* 5 : 1000bt full duplex */
237 };
238
239 static DEFINE_PCI_DEVICE_TABLE(cas_pci_tbl) = {
240 { PCI_VENDOR_ID_SUN, PCI_DEVICE_ID_SUN_CASSINI,
241 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
242 { PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SATURN,
243 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
244 { 0, }
245 };
246
247 MODULE_DEVICE_TABLE(pci, cas_pci_tbl);
248
249 static void cas_set_link_modes(struct cas *cp);
250
251 static inline void cas_lock_tx(struct cas *cp)
252 {
253 int i;
254
255 for (i = 0; i < N_TX_RINGS; i++)
256 spin_lock(&cp->tx_lock[i]);
257 }
258
259 static inline void cas_lock_all(struct cas *cp)
260 {
261 spin_lock_irq(&cp->lock);
262 cas_lock_tx(cp);
263 }
264
265 /* WTZ: QA was finding deadlock problems with the previous
266 * versions after long test runs with multiple cards per machine.
267 * See if replacing cas_lock_all with safer versions helps. The
268 * symptoms QA is reporting match those we'd expect if interrupts
269 * aren't being properly restored, and we fixed a previous deadlock
270 * with similar symptoms by using save/restore versions in other
271 * places.
272 */
273 #define cas_lock_all_save(cp, flags) \
274 do { \
275 struct cas *xxxcp = (cp); \
276 spin_lock_irqsave(&xxxcp->lock, flags); \
277 cas_lock_tx(xxxcp); \
278 } while (0)
279
280 static inline void cas_unlock_tx(struct cas *cp)
281 {
282 int i;
283
284 for (i = N_TX_RINGS; i > 0; i--)
285 spin_unlock(&cp->tx_lock[i - 1]);
286 }
287
288 static inline void cas_unlock_all(struct cas *cp)
289 {
290 cas_unlock_tx(cp);
291 spin_unlock_irq(&cp->lock);
292 }
293
294 #define cas_unlock_all_restore(cp, flags) \
295 do { \
296 struct cas *xxxcp = (cp); \
297 cas_unlock_tx(xxxcp); \
298 spin_unlock_irqrestore(&xxxcp->lock, flags); \
299 } while (0)
300
301 static void cas_disable_irq(struct cas *cp, const int ring)
302 {
303 /* Make sure we won't get any more interrupts */
304 if (ring == 0) {
305 writel(0xFFFFFFFF, cp->regs + REG_INTR_MASK);
306 return;
307 }
308
309 /* disable completion interrupts and selectively mask */
310 if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
311 switch (ring) {
312 #if defined (USE_PCI_INTB) || defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
313 #ifdef USE_PCI_INTB
314 case 1:
315 #endif
316 #ifdef USE_PCI_INTC
317 case 2:
318 #endif
319 #ifdef USE_PCI_INTD
320 case 3:
321 #endif
322 writel(INTRN_MASK_CLEAR_ALL | INTRN_MASK_RX_EN,
323 cp->regs + REG_PLUS_INTRN_MASK(ring));
324 break;
325 #endif
326 default:
327 writel(INTRN_MASK_CLEAR_ALL, cp->regs +
328 REG_PLUS_INTRN_MASK(ring));
329 break;
330 }
331 }
332 }
333
334 static inline void cas_mask_intr(struct cas *cp)
335 {
336 int i;
337
338 for (i = 0; i < N_RX_COMP_RINGS; i++)
339 cas_disable_irq(cp, i);
340 }
341
342 static void cas_enable_irq(struct cas *cp, const int ring)
343 {
344 if (ring == 0) { /* all but TX_DONE */
345 writel(INTR_TX_DONE, cp->regs + REG_INTR_MASK);
346 return;
347 }
348
349 if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
350 switch (ring) {
351 #if defined (USE_PCI_INTB) || defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
352 #ifdef USE_PCI_INTB
353 case 1:
354 #endif
355 #ifdef USE_PCI_INTC
356 case 2:
357 #endif
358 #ifdef USE_PCI_INTD
359 case 3:
360 #endif
361 writel(INTRN_MASK_RX_EN, cp->regs +
362 REG_PLUS_INTRN_MASK(ring));
363 break;
364 #endif
365 default:
366 break;
367 }
368 }
369 }
370
371 static inline void cas_unmask_intr(struct cas *cp)
372 {
373 int i;
374
375 for (i = 0; i < N_RX_COMP_RINGS; i++)
376 cas_enable_irq(cp, i);
377 }
378
379 static inline void cas_entropy_gather(struct cas *cp)
380 {
381 #ifdef USE_ENTROPY_DEV
382 if ((cp->cas_flags & CAS_FLAG_ENTROPY_DEV) == 0)
383 return;
384
385 batch_entropy_store(readl(cp->regs + REG_ENTROPY_IV),
386 readl(cp->regs + REG_ENTROPY_IV),
387 sizeof(uint64_t)*8);
388 #endif
389 }
390
391 static inline void cas_entropy_reset(struct cas *cp)
392 {
393 #ifdef USE_ENTROPY_DEV
394 if ((cp->cas_flags & CAS_FLAG_ENTROPY_DEV) == 0)
395 return;
396
397 writel(BIM_LOCAL_DEV_PAD | BIM_LOCAL_DEV_PROM | BIM_LOCAL_DEV_EXT,
398 cp->regs + REG_BIM_LOCAL_DEV_EN);
399 writeb(ENTROPY_RESET_STC_MODE, cp->regs + REG_ENTROPY_RESET);
400 writeb(0x55, cp->regs + REG_ENTROPY_RAND_REG);
401
402 /* if we read back 0x0, we don't have an entropy device */
403 if (readb(cp->regs + REG_ENTROPY_RAND_REG) == 0)
404 cp->cas_flags &= ~CAS_FLAG_ENTROPY_DEV;
405 #endif
406 }
407
408 /* access to the phy. the following assumes that we've initialized the MIF to
409 * be in frame rather than bit-bang mode
410 */
411 static u16 cas_phy_read(struct cas *cp, int reg)
412 {
413 u32 cmd;
414 int limit = STOP_TRIES_PHY;
415
416 cmd = MIF_FRAME_ST | MIF_FRAME_OP_READ;
417 cmd |= CAS_BASE(MIF_FRAME_PHY_ADDR, cp->phy_addr);
418 cmd |= CAS_BASE(MIF_FRAME_REG_ADDR, reg);
419 cmd |= MIF_FRAME_TURN_AROUND_MSB;
420 writel(cmd, cp->regs + REG_MIF_FRAME);
421
422 /* poll for completion */
423 while (limit-- > 0) {
424 udelay(10);
425 cmd = readl(cp->regs + REG_MIF_FRAME);
426 if (cmd & MIF_FRAME_TURN_AROUND_LSB)
427 return (cmd & MIF_FRAME_DATA_MASK);
428 }
429 return 0xFFFF; /* -1 */
430 }
431
432 static int cas_phy_write(struct cas *cp, int reg, u16 val)
433 {
434 int limit = STOP_TRIES_PHY;
435 u32 cmd;
436
437 cmd = MIF_FRAME_ST | MIF_FRAME_OP_WRITE;
438 cmd |= CAS_BASE(MIF_FRAME_PHY_ADDR, cp->phy_addr);
439 cmd |= CAS_BASE(MIF_FRAME_REG_ADDR, reg);
440 cmd |= MIF_FRAME_TURN_AROUND_MSB;
441 cmd |= val & MIF_FRAME_DATA_MASK;
442 writel(cmd, cp->regs + REG_MIF_FRAME);
443
444 /* poll for completion */
445 while (limit-- > 0) {
446 udelay(10);
447 cmd = readl(cp->regs + REG_MIF_FRAME);
448 if (cmd & MIF_FRAME_TURN_AROUND_LSB)
449 return 0;
450 }
451 return -1;
452 }
453
454 static void cas_phy_powerup(struct cas *cp)
455 {
456 u16 ctl = cas_phy_read(cp, MII_BMCR);
457
458 if ((ctl & BMCR_PDOWN) == 0)
459 return;
460 ctl &= ~BMCR_PDOWN;
461 cas_phy_write(cp, MII_BMCR, ctl);
462 }
463
464 static void cas_phy_powerdown(struct cas *cp)
465 {
466 u16 ctl = cas_phy_read(cp, MII_BMCR);
467
468 if (ctl & BMCR_PDOWN)
469 return;
470 ctl |= BMCR_PDOWN;
471 cas_phy_write(cp, MII_BMCR, ctl);
472 }
473
474 /* cp->lock held. note: the last put_page will free the buffer */
475 static int cas_page_free(struct cas *cp, cas_page_t *page)
476 {
477 pci_unmap_page(cp->pdev, page->dma_addr, cp->page_size,
478 PCI_DMA_FROMDEVICE);
479 __free_pages(page->buffer, cp->page_order);
480 kfree(page);
481 return 0;
482 }
483
484 #ifdef RX_COUNT_BUFFERS
485 #define RX_USED_ADD(x, y) ((x)->used += (y))
486 #define RX_USED_SET(x, y) ((x)->used = (y))
487 #else
488 #define RX_USED_ADD(x, y)
489 #define RX_USED_SET(x, y)
490 #endif
491
492 /* local page allocation routines for the receive buffers. jumbo pages
493 * require at least 8K contiguous and 8K aligned buffers.
494 */
495 static cas_page_t *cas_page_alloc(struct cas *cp, const gfp_t flags)
496 {
497 cas_page_t *page;
498
499 page = kmalloc(sizeof(cas_page_t), flags);
500 if (!page)
501 return NULL;
502
503 INIT_LIST_HEAD(&page->list);
504 RX_USED_SET(page, 0);
505 page->buffer = alloc_pages(flags, cp->page_order);
506 if (!page->buffer)
507 goto page_err;
508 page->dma_addr = pci_map_page(cp->pdev, page->buffer, 0,
509 cp->page_size, PCI_DMA_FROMDEVICE);
510 return page;
511
512 page_err:
513 kfree(page);
514 return NULL;
515 }
516
517 /* initialize spare pool of rx buffers, but allocate during the open */
518 static void cas_spare_init(struct cas *cp)
519 {
520 spin_lock(&cp->rx_inuse_lock);
521 INIT_LIST_HEAD(&cp->rx_inuse_list);
522 spin_unlock(&cp->rx_inuse_lock);
523
524 spin_lock(&cp->rx_spare_lock);
525 INIT_LIST_HEAD(&cp->rx_spare_list);
526 cp->rx_spares_needed = RX_SPARE_COUNT;
527 spin_unlock(&cp->rx_spare_lock);
528 }
529
530 /* used on close. free all the spare buffers. */
531 static void cas_spare_free(struct cas *cp)
532 {
533 struct list_head list, *elem, *tmp;
534
535 /* free spare buffers */
536 INIT_LIST_HEAD(&list);
537 spin_lock(&cp->rx_spare_lock);
538 list_splice_init(&cp->rx_spare_list, &list);
539 spin_unlock(&cp->rx_spare_lock);
540 list_for_each_safe(elem, tmp, &list) {
541 cas_page_free(cp, list_entry(elem, cas_page_t, list));
542 }
543
544 INIT_LIST_HEAD(&list);
545 #if 1
546 /*
547 * Looks like Adrian had protected this with a different
548 * lock than used everywhere else to manipulate this list.
549 */
550 spin_lock(&cp->rx_inuse_lock);
551 list_splice_init(&cp->rx_inuse_list, &list);
552 spin_unlock(&cp->rx_inuse_lock);
553 #else
554 spin_lock(&cp->rx_spare_lock);
555 list_splice_init(&cp->rx_inuse_list, &list);
556 spin_unlock(&cp->rx_spare_lock);
557 #endif
558 list_for_each_safe(elem, tmp, &list) {
559 cas_page_free(cp, list_entry(elem, cas_page_t, list));
560 }
561 }
562
563 /* replenish spares if needed */
564 static void cas_spare_recover(struct cas *cp, const gfp_t flags)
565 {
566 struct list_head list, *elem, *tmp;
567 int needed, i;
568
569 /* check inuse list. if we don't need any more free buffers,
570 * just free it
571 */
572
573 /* make a local copy of the list */
574 INIT_LIST_HEAD(&list);
575 spin_lock(&cp->rx_inuse_lock);
576 list_splice_init(&cp->rx_inuse_list, &list);
577 spin_unlock(&cp->rx_inuse_lock);
578
579 list_for_each_safe(elem, tmp, &list) {
580 cas_page_t *page = list_entry(elem, cas_page_t, list);
581
582 /*
583 * With the lockless pagecache, cassini buffering scheme gets
584 * slightly less accurate: we might find that a page has an
585 * elevated reference count here, due to a speculative ref,
586 * and skip it as in-use. Ideally we would be able to reclaim
587 * it. However this would be such a rare case, it doesn't
588 * matter too much as we should pick it up the next time round.
589 *
590 * Importantly, if we find that the page has a refcount of 1
591 * here (our refcount), then we know it is definitely not inuse
592 * so we can reuse it.
593 */
594 if (page_count(page->buffer) > 1)
595 continue;
596
597 list_del(elem);
598 spin_lock(&cp->rx_spare_lock);
599 if (cp->rx_spares_needed > 0) {
600 list_add(elem, &cp->rx_spare_list);
601 cp->rx_spares_needed--;
602 spin_unlock(&cp->rx_spare_lock);
603 } else {
604 spin_unlock(&cp->rx_spare_lock);
605 cas_page_free(cp, page);
606 }
607 }
608
609 /* put any inuse buffers back on the list */
610 if (!list_empty(&list)) {
611 spin_lock(&cp->rx_inuse_lock);
612 list_splice(&list, &cp->rx_inuse_list);
613 spin_unlock(&cp->rx_inuse_lock);
614 }
615
616 spin_lock(&cp->rx_spare_lock);
617 needed = cp->rx_spares_needed;
618 spin_unlock(&cp->rx_spare_lock);
619 if (!needed)
620 return;
621
622 /* we still need spares, so try to allocate some */
623 INIT_LIST_HEAD(&list);
624 i = 0;
625 while (i < needed) {
626 cas_page_t *spare = cas_page_alloc(cp, flags);
627 if (!spare)
628 break;
629 list_add(&spare->list, &list);
630 i++;
631 }
632
633 spin_lock(&cp->rx_spare_lock);
634 list_splice(&list, &cp->rx_spare_list);
635 cp->rx_spares_needed -= i;
636 spin_unlock(&cp->rx_spare_lock);
637 }
638
639 /* pull a page from the list. */
640 static cas_page_t *cas_page_dequeue(struct cas *cp)
641 {
642 struct list_head *entry;
643 int recover;
644
645 spin_lock(&cp->rx_spare_lock);
646 if (list_empty(&cp->rx_spare_list)) {
647 /* try to do a quick recovery */
648 spin_unlock(&cp->rx_spare_lock);
649 cas_spare_recover(cp, GFP_ATOMIC);
650 spin_lock(&cp->rx_spare_lock);
651 if (list_empty(&cp->rx_spare_list)) {
652 netif_err(cp, rx_err, cp->dev,
653 "no spare buffers available\n");
654 spin_unlock(&cp->rx_spare_lock);
655 return NULL;
656 }
657 }
658
659 entry = cp->rx_spare_list.next;
660 list_del(entry);
661 recover = ++cp->rx_spares_needed;
662 spin_unlock(&cp->rx_spare_lock);
663
664 /* trigger the timer to do the recovery */
665 if ((recover & (RX_SPARE_RECOVER_VAL - 1)) == 0) {
666 #if 1
667 atomic_inc(&cp->reset_task_pending);
668 atomic_inc(&cp->reset_task_pending_spare);
669 schedule_work(&cp->reset_task);
670 #else
671 atomic_set(&cp->reset_task_pending, CAS_RESET_SPARE);
672 schedule_work(&cp->reset_task);
673 #endif
674 }
675 return list_entry(entry, cas_page_t, list);
676 }
677
678
679 static void cas_mif_poll(struct cas *cp, const int enable)
680 {
681 u32 cfg;
682
683 cfg = readl(cp->regs + REG_MIF_CFG);
684 cfg &= (MIF_CFG_MDIO_0 | MIF_CFG_MDIO_1);
685
686 if (cp->phy_type & CAS_PHY_MII_MDIO1)
687 cfg |= MIF_CFG_PHY_SELECT;
688
689 /* poll and interrupt on link status change. */
690 if (enable) {
691 cfg |= MIF_CFG_POLL_EN;
692 cfg |= CAS_BASE(MIF_CFG_POLL_REG, MII_BMSR);
693 cfg |= CAS_BASE(MIF_CFG_POLL_PHY, cp->phy_addr);
694 }
695 writel((enable) ? ~(BMSR_LSTATUS | BMSR_ANEGCOMPLETE) : 0xFFFF,
696 cp->regs + REG_MIF_MASK);
697 writel(cfg, cp->regs + REG_MIF_CFG);
698 }
699
700 /* Must be invoked under cp->lock */
701 static void cas_begin_auto_negotiation(struct cas *cp, struct ethtool_cmd *ep)
702 {
703 u16 ctl;
704 #if 1
705 int lcntl;
706 int changed = 0;
707 int oldstate = cp->lstate;
708 int link_was_not_down = !(oldstate == link_down);
709 #endif
710 /* Setup link parameters */
711 if (!ep)
712 goto start_aneg;
713 lcntl = cp->link_cntl;
714 if (ep->autoneg == AUTONEG_ENABLE)
715 cp->link_cntl = BMCR_ANENABLE;
716 else {
717 cp->link_cntl = 0;
718 if (ep->speed == SPEED_100)
719 cp->link_cntl |= BMCR_SPEED100;
720 else if (ep->speed == SPEED_1000)
721 cp->link_cntl |= CAS_BMCR_SPEED1000;
722 if (ep->duplex == DUPLEX_FULL)
723 cp->link_cntl |= BMCR_FULLDPLX;
724 }
725 #if 1
726 changed = (lcntl != cp->link_cntl);
727 #endif
728 start_aneg:
729 if (cp->lstate == link_up) {
730 netdev_info(cp->dev, "PCS link down\n");
731 } else {
732 if (changed) {
733 netdev_info(cp->dev, "link configuration changed\n");
734 }
735 }
736 cp->lstate = link_down;
737 cp->link_transition = LINK_TRANSITION_LINK_DOWN;
738 if (!cp->hw_running)
739 return;
740 #if 1
741 /*
742 * WTZ: If the old state was link_up, we turn off the carrier
743 * to replicate everything we do elsewhere on a link-down
744 * event when we were already in a link-up state..
745 */
746 if (oldstate == link_up)
747 netif_carrier_off(cp->dev);
748 if (changed && link_was_not_down) {
749 /*
750 * WTZ: This branch will simply schedule a full reset after
751 * we explicitly changed link modes in an ioctl. See if this
752 * fixes the link-problems we were having for forced mode.
753 */
754 atomic_inc(&cp->reset_task_pending);
755 atomic_inc(&cp->reset_task_pending_all);
756 schedule_work(&cp->reset_task);
757 cp->timer_ticks = 0;
758 mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
759 return;
760 }
761 #endif
762 if (cp->phy_type & CAS_PHY_SERDES) {
763 u32 val = readl(cp->regs + REG_PCS_MII_CTRL);
764
765 if (cp->link_cntl & BMCR_ANENABLE) {
766 val |= (PCS_MII_RESTART_AUTONEG | PCS_MII_AUTONEG_EN);
767 cp->lstate = link_aneg;
768 } else {
769 if (cp->link_cntl & BMCR_FULLDPLX)
770 val |= PCS_MII_CTRL_DUPLEX;
771 val &= ~PCS_MII_AUTONEG_EN;
772 cp->lstate = link_force_ok;
773 }
774 cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
775 writel(val, cp->regs + REG_PCS_MII_CTRL);
776
777 } else {
778 cas_mif_poll(cp, 0);
779 ctl = cas_phy_read(cp, MII_BMCR);
780 ctl &= ~(BMCR_FULLDPLX | BMCR_SPEED100 |
781 CAS_BMCR_SPEED1000 | BMCR_ANENABLE);
782 ctl |= cp->link_cntl;
783 if (ctl & BMCR_ANENABLE) {
784 ctl |= BMCR_ANRESTART;
785 cp->lstate = link_aneg;
786 } else {
787 cp->lstate = link_force_ok;
788 }
789 cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
790 cas_phy_write(cp, MII_BMCR, ctl);
791 cas_mif_poll(cp, 1);
792 }
793
794 cp->timer_ticks = 0;
795 mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
796 }
797
798 /* Must be invoked under cp->lock. */
799 static int cas_reset_mii_phy(struct cas *cp)
800 {
801 int limit = STOP_TRIES_PHY;
802 u16 val;
803
804 cas_phy_write(cp, MII_BMCR, BMCR_RESET);
805 udelay(100);
806 while (--limit) {
807 val = cas_phy_read(cp, MII_BMCR);
808 if ((val & BMCR_RESET) == 0)
809 break;
810 udelay(10);
811 }
812 return (limit <= 0);
813 }
814
815 static int cas_saturn_firmware_init(struct cas *cp)
816 {
817 const struct firmware *fw;
818 const char fw_name[] = "sun/cassini.bin";
819 int err;
820
821 if (PHY_NS_DP83065 != cp->phy_id)
822 return 0;
823
824 err = request_firmware(&fw, fw_name, &cp->pdev->dev);
825 if (err) {
826 pr_err("Failed to load firmware \"%s\"\n",
827 fw_name);
828 return err;
829 }
830 if (fw->size < 2) {
831 pr_err("bogus length %zu in \"%s\"\n",
832 fw->size, fw_name);
833 err = -EINVAL;
834 goto out;
835 }
836 cp->fw_load_addr= fw->data[1] << 8 | fw->data[0];
837 cp->fw_size = fw->size - 2;
838 cp->fw_data = vmalloc(cp->fw_size);
839 if (!cp->fw_data) {
840 err = -ENOMEM;
841 pr_err("\"%s\" Failed %d\n", fw_name, err);
842 goto out;
843 }
844 memcpy(cp->fw_data, &fw->data[2], cp->fw_size);
845 out:
846 release_firmware(fw);
847 return err;
848 }
849
850 static void cas_saturn_firmware_load(struct cas *cp)
851 {
852 int i;
853
854 cas_phy_powerdown(cp);
855
856 /* expanded memory access mode */
857 cas_phy_write(cp, DP83065_MII_MEM, 0x0);
858
859 /* pointer configuration for new firmware */
860 cas_phy_write(cp, DP83065_MII_REGE, 0x8ff9);
861 cas_phy_write(cp, DP83065_MII_REGD, 0xbd);
862 cas_phy_write(cp, DP83065_MII_REGE, 0x8ffa);
863 cas_phy_write(cp, DP83065_MII_REGD, 0x82);
864 cas_phy_write(cp, DP83065_MII_REGE, 0x8ffb);
865 cas_phy_write(cp, DP83065_MII_REGD, 0x0);
866 cas_phy_write(cp, DP83065_MII_REGE, 0x8ffc);
867 cas_phy_write(cp, DP83065_MII_REGD, 0x39);
868
869 /* download new firmware */
870 cas_phy_write(cp, DP83065_MII_MEM, 0x1);
871 cas_phy_write(cp, DP83065_MII_REGE, cp->fw_load_addr);
872 for (i = 0; i < cp->fw_size; i++)
873 cas_phy_write(cp, DP83065_MII_REGD, cp->fw_data[i]);
874
875 /* enable firmware */
876 cas_phy_write(cp, DP83065_MII_REGE, 0x8ff8);
877 cas_phy_write(cp, DP83065_MII_REGD, 0x1);
878 }
879
880
881 /* phy initialization */
882 static void cas_phy_init(struct cas *cp)
883 {
884 u16 val;
885
886 /* if we're in MII/GMII mode, set up phy */
887 if (CAS_PHY_MII(cp->phy_type)) {
888 writel(PCS_DATAPATH_MODE_MII,
889 cp->regs + REG_PCS_DATAPATH_MODE);
890
891 cas_mif_poll(cp, 0);
892 cas_reset_mii_phy(cp); /* take out of isolate mode */
893
894 if (PHY_LUCENT_B0 == cp->phy_id) {
895 /* workaround link up/down issue with lucent */
896 cas_phy_write(cp, LUCENT_MII_REG, 0x8000);
897 cas_phy_write(cp, MII_BMCR, 0x00f1);
898 cas_phy_write(cp, LUCENT_MII_REG, 0x0);
899
900 } else if (PHY_BROADCOM_B0 == (cp->phy_id & 0xFFFFFFFC)) {
901 /* workarounds for broadcom phy */
902 cas_phy_write(cp, BROADCOM_MII_REG8, 0x0C20);
903 cas_phy_write(cp, BROADCOM_MII_REG7, 0x0012);
904 cas_phy_write(cp, BROADCOM_MII_REG5, 0x1804);
905 cas_phy_write(cp, BROADCOM_MII_REG7, 0x0013);
906 cas_phy_write(cp, BROADCOM_MII_REG5, 0x1204);
907 cas_phy_write(cp, BROADCOM_MII_REG7, 0x8006);
908 cas_phy_write(cp, BROADCOM_MII_REG5, 0x0132);
909 cas_phy_write(cp, BROADCOM_MII_REG7, 0x8006);
910 cas_phy_write(cp, BROADCOM_MII_REG5, 0x0232);
911 cas_phy_write(cp, BROADCOM_MII_REG7, 0x201F);
912 cas_phy_write(cp, BROADCOM_MII_REG5, 0x0A20);
913
914 } else if (PHY_BROADCOM_5411 == cp->phy_id) {
915 val = cas_phy_read(cp, BROADCOM_MII_REG4);
916 val = cas_phy_read(cp, BROADCOM_MII_REG4);
917 if (val & 0x0080) {
918 /* link workaround */
919 cas_phy_write(cp, BROADCOM_MII_REG4,
920 val & ~0x0080);
921 }
922
923 } else if (cp->cas_flags & CAS_FLAG_SATURN) {
924 writel((cp->phy_type & CAS_PHY_MII_MDIO0) ?
925 SATURN_PCFG_FSI : 0x0,
926 cp->regs + REG_SATURN_PCFG);
927
928 /* load firmware to address 10Mbps auto-negotiation
929 * issue. NOTE: this will need to be changed if the
930 * default firmware gets fixed.
931 */
932 if (PHY_NS_DP83065 == cp->phy_id) {
933 cas_saturn_firmware_load(cp);
934 }
935 cas_phy_powerup(cp);
936 }
937
938 /* advertise capabilities */
939 val = cas_phy_read(cp, MII_BMCR);
940 val &= ~BMCR_ANENABLE;
941 cas_phy_write(cp, MII_BMCR, val);
942 udelay(10);
943
944 cas_phy_write(cp, MII_ADVERTISE,
945 cas_phy_read(cp, MII_ADVERTISE) |
946 (ADVERTISE_10HALF | ADVERTISE_10FULL |
947 ADVERTISE_100HALF | ADVERTISE_100FULL |
948 CAS_ADVERTISE_PAUSE |
949 CAS_ADVERTISE_ASYM_PAUSE));
950
951 if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
952 /* make sure that we don't advertise half
953 * duplex to avoid a chip issue
954 */
955 val = cas_phy_read(cp, CAS_MII_1000_CTRL);
956 val &= ~CAS_ADVERTISE_1000HALF;
957 val |= CAS_ADVERTISE_1000FULL;
958 cas_phy_write(cp, CAS_MII_1000_CTRL, val);
959 }
960
961 } else {
962 /* reset pcs for serdes */
963 u32 val;
964 int limit;
965
966 writel(PCS_DATAPATH_MODE_SERDES,
967 cp->regs + REG_PCS_DATAPATH_MODE);
968
969 /* enable serdes pins on saturn */
970 if (cp->cas_flags & CAS_FLAG_SATURN)
971 writel(0, cp->regs + REG_SATURN_PCFG);
972
973 /* Reset PCS unit. */
974 val = readl(cp->regs + REG_PCS_MII_CTRL);
975 val |= PCS_MII_RESET;
976 writel(val, cp->regs + REG_PCS_MII_CTRL);
977
978 limit = STOP_TRIES;
979 while (--limit > 0) {
980 udelay(10);
981 if ((readl(cp->regs + REG_PCS_MII_CTRL) &
982 PCS_MII_RESET) == 0)
983 break;
984 }
985 if (limit <= 0)
986 netdev_warn(cp->dev, "PCS reset bit would not clear [%08x]\n",
987 readl(cp->regs + REG_PCS_STATE_MACHINE));
988
989 /* Make sure PCS is disabled while changing advertisement
990 * configuration.
991 */
992 writel(0x0, cp->regs + REG_PCS_CFG);
993
994 /* Advertise all capabilities except half-duplex. */
995 val = readl(cp->regs + REG_PCS_MII_ADVERT);
996 val &= ~PCS_MII_ADVERT_HD;
997 val |= (PCS_MII_ADVERT_FD | PCS_MII_ADVERT_SYM_PAUSE |
998 PCS_MII_ADVERT_ASYM_PAUSE);
999 writel(val, cp->regs + REG_PCS_MII_ADVERT);
1000
1001 /* enable PCS */
1002 writel(PCS_CFG_EN, cp->regs + REG_PCS_CFG);
1003
1004 /* pcs workaround: enable sync detect */
1005 writel(PCS_SERDES_CTRL_SYNCD_EN,
1006 cp->regs + REG_PCS_SERDES_CTRL);
1007 }
1008 }
1009
1010
1011 static int cas_pcs_link_check(struct cas *cp)
1012 {
1013 u32 stat, state_machine;
1014 int retval = 0;
1015
1016 /* The link status bit latches on zero, so you must
1017 * read it twice in such a case to see a transition
1018 * to the link being up.
1019 */
1020 stat = readl(cp->regs + REG_PCS_MII_STATUS);
1021 if ((stat & PCS_MII_STATUS_LINK_STATUS) == 0)
1022 stat = readl(cp->regs + REG_PCS_MII_STATUS);
1023
1024 /* The remote-fault indication is only valid
1025 * when autoneg has completed.
1026 */
1027 if ((stat & (PCS_MII_STATUS_AUTONEG_COMP |
1028 PCS_MII_STATUS_REMOTE_FAULT)) ==
1029 (PCS_MII_STATUS_AUTONEG_COMP | PCS_MII_STATUS_REMOTE_FAULT))
1030 netif_info(cp, link, cp->dev, "PCS RemoteFault\n");
1031
1032 /* work around link detection issue by querying the PCS state
1033 * machine directly.
1034 */
1035 state_machine = readl(cp->regs + REG_PCS_STATE_MACHINE);
1036 if ((state_machine & PCS_SM_LINK_STATE_MASK) != SM_LINK_STATE_UP) {
1037 stat &= ~PCS_MII_STATUS_LINK_STATUS;
1038 } else if (state_machine & PCS_SM_WORD_SYNC_STATE_MASK) {
1039 stat |= PCS_MII_STATUS_LINK_STATUS;
1040 }
1041
1042 if (stat & PCS_MII_STATUS_LINK_STATUS) {
1043 if (cp->lstate != link_up) {
1044 if (cp->opened) {
1045 cp->lstate = link_up;
1046 cp->link_transition = LINK_TRANSITION_LINK_UP;
1047
1048 cas_set_link_modes(cp);
1049 netif_carrier_on(cp->dev);
1050 }
1051 }
1052 } else if (cp->lstate == link_up) {
1053 cp->lstate = link_down;
1054 if (link_transition_timeout != 0 &&
1055 cp->link_transition != LINK_TRANSITION_REQUESTED_RESET &&
1056 !cp->link_transition_jiffies_valid) {
1057 /*
1058 * force a reset, as a workaround for the
1059 * link-failure problem. May want to move this to a
1060 * point a bit earlier in the sequence. If we had
1061 * generated a reset a short time ago, we'll wait for
1062 * the link timer to check the status until a
1063 * timer expires (link_transistion_jiffies_valid is
1064 * true when the timer is running.) Instead of using
1065 * a system timer, we just do a check whenever the
1066 * link timer is running - this clears the flag after
1067 * a suitable delay.
1068 */
1069 retval = 1;
1070 cp->link_transition = LINK_TRANSITION_REQUESTED_RESET;
1071 cp->link_transition_jiffies = jiffies;
1072 cp->link_transition_jiffies_valid = 1;
1073 } else {
1074 cp->link_transition = LINK_TRANSITION_ON_FAILURE;
1075 }
1076 netif_carrier_off(cp->dev);
1077 if (cp->opened)
1078 netif_info(cp, link, cp->dev, "PCS link down\n");
1079
1080 /* Cassini only: if you force a mode, there can be
1081 * sync problems on link down. to fix that, the following
1082 * things need to be checked:
1083 * 1) read serialink state register
1084 * 2) read pcs status register to verify link down.
1085 * 3) if link down and serial link == 0x03, then you need
1086 * to global reset the chip.
1087 */
1088 if ((cp->cas_flags & CAS_FLAG_REG_PLUS) == 0) {
1089 /* should check to see if we're in a forced mode */
1090 stat = readl(cp->regs + REG_PCS_SERDES_STATE);
1091 if (stat == 0x03)
1092 return 1;
1093 }
1094 } else if (cp->lstate == link_down) {
1095 if (link_transition_timeout != 0 &&
1096 cp->link_transition != LINK_TRANSITION_REQUESTED_RESET &&
1097 !cp->link_transition_jiffies_valid) {
1098 /* force a reset, as a workaround for the
1099 * link-failure problem. May want to move
1100 * this to a point a bit earlier in the
1101 * sequence.
1102 */
1103 retval = 1;
1104 cp->link_transition = LINK_TRANSITION_REQUESTED_RESET;
1105 cp->link_transition_jiffies = jiffies;
1106 cp->link_transition_jiffies_valid = 1;
1107 } else {
1108 cp->link_transition = LINK_TRANSITION_STILL_FAILED;
1109 }
1110 }
1111
1112 return retval;
1113 }
1114
1115 static int cas_pcs_interrupt(struct net_device *dev,
1116 struct cas *cp, u32 status)
1117 {
1118 u32 stat = readl(cp->regs + REG_PCS_INTR_STATUS);
1119
1120 if ((stat & PCS_INTR_STATUS_LINK_CHANGE) == 0)
1121 return 0;
1122 return cas_pcs_link_check(cp);
1123 }
1124
1125 static int cas_txmac_interrupt(struct net_device *dev,
1126 struct cas *cp, u32 status)
1127 {
1128 u32 txmac_stat = readl(cp->regs + REG_MAC_TX_STATUS);
1129
1130 if (!txmac_stat)
1131 return 0;
1132
1133 netif_printk(cp, intr, KERN_DEBUG, cp->dev,
1134 "txmac interrupt, txmac_stat: 0x%x\n", txmac_stat);
1135
1136 /* Defer timer expiration is quite normal,
1137 * don't even log the event.
1138 */
1139 if ((txmac_stat & MAC_TX_DEFER_TIMER) &&
1140 !(txmac_stat & ~MAC_TX_DEFER_TIMER))
1141 return 0;
1142
1143 spin_lock(&cp->stat_lock[0]);
1144 if (txmac_stat & MAC_TX_UNDERRUN) {
1145 netdev_err(dev, "TX MAC xmit underrun\n");
1146 cp->net_stats[0].tx_fifo_errors++;
1147 }
1148
1149 if (txmac_stat & MAC_TX_MAX_PACKET_ERR) {
1150 netdev_err(dev, "TX MAC max packet size error\n");
1151 cp->net_stats[0].tx_errors++;
1152 }
1153
1154 /* The rest are all cases of one of the 16-bit TX
1155 * counters expiring.
1156 */
1157 if (txmac_stat & MAC_TX_COLL_NORMAL)
1158 cp->net_stats[0].collisions += 0x10000;
1159
1160 if (txmac_stat & MAC_TX_COLL_EXCESS) {
1161 cp->net_stats[0].tx_aborted_errors += 0x10000;
1162 cp->net_stats[0].collisions += 0x10000;
1163 }
1164
1165 if (txmac_stat & MAC_TX_COLL_LATE) {
1166 cp->net_stats[0].tx_aborted_errors += 0x10000;
1167 cp->net_stats[0].collisions += 0x10000;
1168 }
1169 spin_unlock(&cp->stat_lock[0]);
1170
1171 /* We do not keep track of MAC_TX_COLL_FIRST and
1172 * MAC_TX_PEAK_ATTEMPTS events.
1173 */
1174 return 0;
1175 }
1176
1177 static void cas_load_firmware(struct cas *cp, cas_hp_inst_t *firmware)
1178 {
1179 cas_hp_inst_t *inst;
1180 u32 val;
1181 int i;
1182
1183 i = 0;
1184 while ((inst = firmware) && inst->note) {
1185 writel(i, cp->regs + REG_HP_INSTR_RAM_ADDR);
1186
1187 val = CAS_BASE(HP_INSTR_RAM_HI_VAL, inst->val);
1188 val |= CAS_BASE(HP_INSTR_RAM_HI_MASK, inst->mask);
1189 writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_HI);
1190
1191 val = CAS_BASE(HP_INSTR_RAM_MID_OUTARG, inst->outarg >> 10);
1192 val |= CAS_BASE(HP_INSTR_RAM_MID_OUTOP, inst->outop);
1193 val |= CAS_BASE(HP_INSTR_RAM_MID_FNEXT, inst->fnext);
1194 val |= CAS_BASE(HP_INSTR_RAM_MID_FOFF, inst->foff);
1195 val |= CAS_BASE(HP_INSTR_RAM_MID_SNEXT, inst->snext);
1196 val |= CAS_BASE(HP_INSTR_RAM_MID_SOFF, inst->soff);
1197 val |= CAS_BASE(HP_INSTR_RAM_MID_OP, inst->op);
1198 writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_MID);
1199
1200 val = CAS_BASE(HP_INSTR_RAM_LOW_OUTMASK, inst->outmask);
1201 val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTSHIFT, inst->outshift);
1202 val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTEN, inst->outenab);
1203 val |= CAS_BASE(HP_INSTR_RAM_LOW_OUTARG, inst->outarg);
1204 writel(val, cp->regs + REG_HP_INSTR_RAM_DATA_LOW);
1205 ++firmware;
1206 ++i;
1207 }
1208 }
1209
1210 static void cas_init_rx_dma(struct cas *cp)
1211 {
1212 u64 desc_dma = cp->block_dvma;
1213 u32 val;
1214 int i, size;
1215
1216 /* rx free descriptors */
1217 val = CAS_BASE(RX_CFG_SWIVEL, RX_SWIVEL_OFF_VAL);
1218 val |= CAS_BASE(RX_CFG_DESC_RING, RX_DESC_RINGN_INDEX(0));
1219 val |= CAS_BASE(RX_CFG_COMP_RING, RX_COMP_RINGN_INDEX(0));
1220 if ((N_RX_DESC_RINGS > 1) &&
1221 (cp->cas_flags & CAS_FLAG_REG_PLUS)) /* do desc 2 */
1222 val |= CAS_BASE(RX_CFG_DESC_RING1, RX_DESC_RINGN_INDEX(1));
1223 writel(val, cp->regs + REG_RX_CFG);
1224
1225 val = (unsigned long) cp->init_rxds[0] -
1226 (unsigned long) cp->init_block;
1227 writel((desc_dma + val) >> 32, cp->regs + REG_RX_DB_HI);
1228 writel((desc_dma + val) & 0xffffffff, cp->regs + REG_RX_DB_LOW);
1229 writel(RX_DESC_RINGN_SIZE(0) - 4, cp->regs + REG_RX_KICK);
1230
1231 if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
1232 /* rx desc 2 is for IPSEC packets. however,
1233 * we don't it that for that purpose.
1234 */
1235 val = (unsigned long) cp->init_rxds[1] -
1236 (unsigned long) cp->init_block;
1237 writel((desc_dma + val) >> 32, cp->regs + REG_PLUS_RX_DB1_HI);
1238 writel((desc_dma + val) & 0xffffffff, cp->regs +
1239 REG_PLUS_RX_DB1_LOW);
1240 writel(RX_DESC_RINGN_SIZE(1) - 4, cp->regs +
1241 REG_PLUS_RX_KICK1);
1242 }
1243
1244 /* rx completion registers */
1245 val = (unsigned long) cp->init_rxcs[0] -
1246 (unsigned long) cp->init_block;
1247 writel((desc_dma + val) >> 32, cp->regs + REG_RX_CB_HI);
1248 writel((desc_dma + val) & 0xffffffff, cp->regs + REG_RX_CB_LOW);
1249
1250 if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
1251 /* rx comp 2-4 */
1252 for (i = 1; i < MAX_RX_COMP_RINGS; i++) {
1253 val = (unsigned long) cp->init_rxcs[i] -
1254 (unsigned long) cp->init_block;
1255 writel((desc_dma + val) >> 32, cp->regs +
1256 REG_PLUS_RX_CBN_HI(i));
1257 writel((desc_dma + val) & 0xffffffff, cp->regs +
1258 REG_PLUS_RX_CBN_LOW(i));
1259 }
1260 }
1261
1262 /* read selective clear regs to prevent spurious interrupts
1263 * on reset because complete == kick.
1264 * selective clear set up to prevent interrupts on resets
1265 */
1266 readl(cp->regs + REG_INTR_STATUS_ALIAS);
1267 writel(INTR_RX_DONE | INTR_RX_BUF_UNAVAIL, cp->regs + REG_ALIAS_CLEAR);
1268 if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
1269 for (i = 1; i < N_RX_COMP_RINGS; i++)
1270 readl(cp->regs + REG_PLUS_INTRN_STATUS_ALIAS(i));
1271
1272 /* 2 is different from 3 and 4 */
1273 if (N_RX_COMP_RINGS > 1)
1274 writel(INTR_RX_DONE_ALT | INTR_RX_BUF_UNAVAIL_1,
1275 cp->regs + REG_PLUS_ALIASN_CLEAR(1));
1276
1277 for (i = 2; i < N_RX_COMP_RINGS; i++)
1278 writel(INTR_RX_DONE_ALT,
1279 cp->regs + REG_PLUS_ALIASN_CLEAR(i));
1280 }
1281
1282 /* set up pause thresholds */
1283 val = CAS_BASE(RX_PAUSE_THRESH_OFF,
1284 cp->rx_pause_off / RX_PAUSE_THRESH_QUANTUM);
1285 val |= CAS_BASE(RX_PAUSE_THRESH_ON,
1286 cp->rx_pause_on / RX_PAUSE_THRESH_QUANTUM);
1287 writel(val, cp->regs + REG_RX_PAUSE_THRESH);
1288
1289 /* zero out dma reassembly buffers */
1290 for (i = 0; i < 64; i++) {
1291 writel(i, cp->regs + REG_RX_TABLE_ADDR);
1292 writel(0x0, cp->regs + REG_RX_TABLE_DATA_LOW);
1293 writel(0x0, cp->regs + REG_RX_TABLE_DATA_MID);
1294 writel(0x0, cp->regs + REG_RX_TABLE_DATA_HI);
1295 }
1296
1297 /* make sure address register is 0 for normal operation */
1298 writel(0x0, cp->regs + REG_RX_CTRL_FIFO_ADDR);
1299 writel(0x0, cp->regs + REG_RX_IPP_FIFO_ADDR);
1300
1301 /* interrupt mitigation */
1302 #ifdef USE_RX_BLANK
1303 val = CAS_BASE(RX_BLANK_INTR_TIME, RX_BLANK_INTR_TIME_VAL);
1304 val |= CAS_BASE(RX_BLANK_INTR_PKT, RX_BLANK_INTR_PKT_VAL);
1305 writel(val, cp->regs + REG_RX_BLANK);
1306 #else
1307 writel(0x0, cp->regs + REG_RX_BLANK);
1308 #endif
1309
1310 /* interrupt generation as a function of low water marks for
1311 * free desc and completion entries. these are used to trigger
1312 * housekeeping for rx descs. we don't use the free interrupt
1313 * as it's not very useful
1314 */
1315 /* val = CAS_BASE(RX_AE_THRESH_FREE, RX_AE_FREEN_VAL(0)); */
1316 val = CAS_BASE(RX_AE_THRESH_COMP, RX_AE_COMP_VAL);
1317 writel(val, cp->regs + REG_RX_AE_THRESH);
1318 if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
1319 val = CAS_BASE(RX_AE1_THRESH_FREE, RX_AE_FREEN_VAL(1));
1320 writel(val, cp->regs + REG_PLUS_RX_AE1_THRESH);
1321 }
1322
1323 /* Random early detect registers. useful for congestion avoidance.
1324 * this should be tunable.
1325 */
1326 writel(0x0, cp->regs + REG_RX_RED);
1327
1328 /* receive page sizes. default == 2K (0x800) */
1329 val = 0;
1330 if (cp->page_size == 0x1000)
1331 val = 0x1;
1332 else if (cp->page_size == 0x2000)
1333 val = 0x2;
1334 else if (cp->page_size == 0x4000)
1335 val = 0x3;
1336
1337 /* round mtu + offset. constrain to page size. */
1338 size = cp->dev->mtu + 64;
1339 if (size > cp->page_size)
1340 size = cp->page_size;
1341
1342 if (size <= 0x400)
1343 i = 0x0;
1344 else if (size <= 0x800)
1345 i = 0x1;
1346 else if (size <= 0x1000)
1347 i = 0x2;
1348 else
1349 i = 0x3;
1350
1351 cp->mtu_stride = 1 << (i + 10);
1352 val = CAS_BASE(RX_PAGE_SIZE, val);
1353 val |= CAS_BASE(RX_PAGE_SIZE_MTU_STRIDE, i);
1354 val |= CAS_BASE(RX_PAGE_SIZE_MTU_COUNT, cp->page_size >> (i + 10));
1355 val |= CAS_BASE(RX_PAGE_SIZE_MTU_OFF, 0x1);
1356 writel(val, cp->regs + REG_RX_PAGE_SIZE);
1357
1358 /* enable the header parser if desired */
1359 if (CAS_HP_FIRMWARE == cas_prog_null)
1360 return;
1361
1362 val = CAS_BASE(HP_CFG_NUM_CPU, CAS_NCPUS > 63 ? 0 : CAS_NCPUS);
1363 val |= HP_CFG_PARSE_EN | HP_CFG_SYN_INC_MASK;
1364 val |= CAS_BASE(HP_CFG_TCP_THRESH, HP_TCP_THRESH_VAL);
1365 writel(val, cp->regs + REG_HP_CFG);
1366 }
1367
1368 static inline void cas_rxc_init(struct cas_rx_comp *rxc)
1369 {
1370 memset(rxc, 0, sizeof(*rxc));
1371 rxc->word4 = cpu_to_le64(RX_COMP4_ZERO);
1372 }
1373
1374 /* NOTE: we use the ENC RX DESC ring for spares. the rx_page[0,1]
1375 * flipping is protected by the fact that the chip will not
1376 * hand back the same page index while it's being processed.
1377 */
1378 static inline cas_page_t *cas_page_spare(struct cas *cp, const int index)
1379 {
1380 cas_page_t *page = cp->rx_pages[1][index];
1381 cas_page_t *new;
1382
1383 if (page_count(page->buffer) == 1)
1384 return page;
1385
1386 new = cas_page_dequeue(cp);
1387 if (new) {
1388 spin_lock(&cp->rx_inuse_lock);
1389 list_add(&page->list, &cp->rx_inuse_list);
1390 spin_unlock(&cp->rx_inuse_lock);
1391 }
1392 return new;
1393 }
1394
1395 /* this needs to be changed if we actually use the ENC RX DESC ring */
1396 static cas_page_t *cas_page_swap(struct cas *cp, const int ring,
1397 const int index)
1398 {
1399 cas_page_t **page0 = cp->rx_pages[0];
1400 cas_page_t **page1 = cp->rx_pages[1];
1401
1402 /* swap if buffer is in use */
1403 if (page_count(page0[index]->buffer) > 1) {
1404 cas_page_t *new = cas_page_spare(cp, index);
1405 if (new) {
1406 page1[index] = page0[index];
1407 page0[index] = new;
1408 }
1409 }
1410 RX_USED_SET(page0[index], 0);
1411 return page0[index];
1412 }
1413
1414 static void cas_clean_rxds(struct cas *cp)
1415 {
1416 /* only clean ring 0 as ring 1 is used for spare buffers */
1417 struct cas_rx_desc *rxd = cp->init_rxds[0];
1418 int i, size;
1419
1420 /* release all rx flows */
1421 for (i = 0; i < N_RX_FLOWS; i++) {
1422 struct sk_buff *skb;
1423 while ((skb = __skb_dequeue(&cp->rx_flows[i]))) {
1424 cas_skb_release(skb);
1425 }
1426 }
1427
1428 /* initialize descriptors */
1429 size = RX_DESC_RINGN_SIZE(0);
1430 for (i = 0; i < size; i++) {
1431 cas_page_t *page = cas_page_swap(cp, 0, i);
1432 rxd[i].buffer = cpu_to_le64(page->dma_addr);
1433 rxd[i].index = cpu_to_le64(CAS_BASE(RX_INDEX_NUM, i) |
1434 CAS_BASE(RX_INDEX_RING, 0));
1435 }
1436
1437 cp->rx_old[0] = RX_DESC_RINGN_SIZE(0) - 4;
1438 cp->rx_last[0] = 0;
1439 cp->cas_flags &= ~CAS_FLAG_RXD_POST(0);
1440 }
1441
1442 static void cas_clean_rxcs(struct cas *cp)
1443 {
1444 int i, j;
1445
1446 /* take ownership of rx comp descriptors */
1447 memset(cp->rx_cur, 0, sizeof(*cp->rx_cur)*N_RX_COMP_RINGS);
1448 memset(cp->rx_new, 0, sizeof(*cp->rx_new)*N_RX_COMP_RINGS);
1449 for (i = 0; i < N_RX_COMP_RINGS; i++) {
1450 struct cas_rx_comp *rxc = cp->init_rxcs[i];
1451 for (j = 0; j < RX_COMP_RINGN_SIZE(i); j++) {
1452 cas_rxc_init(rxc + j);
1453 }
1454 }
1455 }
1456
1457 #if 0
1458 /* When we get a RX fifo overflow, the RX unit is probably hung
1459 * so we do the following.
1460 *
1461 * If any part of the reset goes wrong, we return 1 and that causes the
1462 * whole chip to be reset.
1463 */
1464 static int cas_rxmac_reset(struct cas *cp)
1465 {
1466 struct net_device *dev = cp->dev;
1467 int limit;
1468 u32 val;
1469
1470 /* First, reset MAC RX. */
1471 writel(cp->mac_rx_cfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
1472 for (limit = 0; limit < STOP_TRIES; limit++) {
1473 if (!(readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_EN))
1474 break;
1475 udelay(10);
1476 }
1477 if (limit == STOP_TRIES) {
1478 netdev_err(dev, "RX MAC will not disable, resetting whole chip\n");
1479 return 1;
1480 }
1481
1482 /* Second, disable RX DMA. */
1483 writel(0, cp->regs + REG_RX_CFG);
1484 for (limit = 0; limit < STOP_TRIES; limit++) {
1485 if (!(readl(cp->regs + REG_RX_CFG) & RX_CFG_DMA_EN))
1486 break;
1487 udelay(10);
1488 }
1489 if (limit == STOP_TRIES) {
1490 netdev_err(dev, "RX DMA will not disable, resetting whole chip\n");
1491 return 1;
1492 }
1493
1494 mdelay(5);
1495
1496 /* Execute RX reset command. */
1497 writel(SW_RESET_RX, cp->regs + REG_SW_RESET);
1498 for (limit = 0; limit < STOP_TRIES; limit++) {
1499 if (!(readl(cp->regs + REG_SW_RESET) & SW_RESET_RX))
1500 break;
1501 udelay(10);
1502 }
1503 if (limit == STOP_TRIES) {
1504 netdev_err(dev, "RX reset command will not execute, resetting whole chip\n");
1505 return 1;
1506 }
1507
1508 /* reset driver rx state */
1509 cas_clean_rxds(cp);
1510 cas_clean_rxcs(cp);
1511
1512 /* Now, reprogram the rest of RX unit. */
1513 cas_init_rx_dma(cp);
1514
1515 /* re-enable */
1516 val = readl(cp->regs + REG_RX_CFG);
1517 writel(val | RX_CFG_DMA_EN, cp->regs + REG_RX_CFG);
1518 writel(MAC_RX_FRAME_RECV, cp->regs + REG_MAC_RX_MASK);
1519 val = readl(cp->regs + REG_MAC_RX_CFG);
1520 writel(val | MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
1521 return 0;
1522 }
1523 #endif
1524
1525 static int cas_rxmac_interrupt(struct net_device *dev, struct cas *cp,
1526 u32 status)
1527 {
1528 u32 stat = readl(cp->regs + REG_MAC_RX_STATUS);
1529
1530 if (!stat)
1531 return 0;
1532
1533 netif_dbg(cp, intr, cp->dev, "rxmac interrupt, stat: 0x%x\n", stat);
1534
1535 /* these are all rollovers */
1536 spin_lock(&cp->stat_lock[0]);
1537 if (stat & MAC_RX_ALIGN_ERR)
1538 cp->net_stats[0].rx_frame_errors += 0x10000;
1539
1540 if (stat & MAC_RX_CRC_ERR)
1541 cp->net_stats[0].rx_crc_errors += 0x10000;
1542
1543 if (stat & MAC_RX_LEN_ERR)
1544 cp->net_stats[0].rx_length_errors += 0x10000;
1545
1546 if (stat & MAC_RX_OVERFLOW) {
1547 cp->net_stats[0].rx_over_errors++;
1548 cp->net_stats[0].rx_fifo_errors++;
1549 }
1550
1551 /* We do not track MAC_RX_FRAME_COUNT and MAC_RX_VIOL_ERR
1552 * events.
1553 */
1554 spin_unlock(&cp->stat_lock[0]);
1555 return 0;
1556 }
1557
1558 static int cas_mac_interrupt(struct net_device *dev, struct cas *cp,
1559 u32 status)
1560 {
1561 u32 stat = readl(cp->regs + REG_MAC_CTRL_STATUS);
1562
1563 if (!stat)
1564 return 0;
1565
1566 netif_printk(cp, intr, KERN_DEBUG, cp->dev,
1567 "mac interrupt, stat: 0x%x\n", stat);
1568
1569 /* This interrupt is just for pause frame and pause
1570 * tracking. It is useful for diagnostics and debug
1571 * but probably by default we will mask these events.
1572 */
1573 if (stat & MAC_CTRL_PAUSE_STATE)
1574 cp->pause_entered++;
1575
1576 if (stat & MAC_CTRL_PAUSE_RECEIVED)
1577 cp->pause_last_time_recvd = (stat >> 16);
1578
1579 return 0;
1580 }
1581
1582
1583 /* Must be invoked under cp->lock. */
1584 static inline int cas_mdio_link_not_up(struct cas *cp)
1585 {
1586 u16 val;
1587
1588 switch (cp->lstate) {
1589 case link_force_ret:
1590 netif_info(cp, link, cp->dev, "Autoneg failed again, keeping forced mode\n");
1591 cas_phy_write(cp, MII_BMCR, cp->link_fcntl);
1592 cp->timer_ticks = 5;
1593 cp->lstate = link_force_ok;
1594 cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
1595 break;
1596
1597 case link_aneg:
1598 val = cas_phy_read(cp, MII_BMCR);
1599
1600 /* Try forced modes. we try things in the following order:
1601 * 1000 full -> 100 full/half -> 10 half
1602 */
1603 val &= ~(BMCR_ANRESTART | BMCR_ANENABLE);
1604 val |= BMCR_FULLDPLX;
1605 val |= (cp->cas_flags & CAS_FLAG_1000MB_CAP) ?
1606 CAS_BMCR_SPEED1000 : BMCR_SPEED100;
1607 cas_phy_write(cp, MII_BMCR, val);
1608 cp->timer_ticks = 5;
1609 cp->lstate = link_force_try;
1610 cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
1611 break;
1612
1613 case link_force_try:
1614 /* Downgrade from 1000 to 100 to 10 Mbps if necessary. */
1615 val = cas_phy_read(cp, MII_BMCR);
1616 cp->timer_ticks = 5;
1617 if (val & CAS_BMCR_SPEED1000) { /* gigabit */
1618 val &= ~CAS_BMCR_SPEED1000;
1619 val |= (BMCR_SPEED100 | BMCR_FULLDPLX);
1620 cas_phy_write(cp, MII_BMCR, val);
1621 break;
1622 }
1623
1624 if (val & BMCR_SPEED100) {
1625 if (val & BMCR_FULLDPLX) /* fd failed */
1626 val &= ~BMCR_FULLDPLX;
1627 else { /* 100Mbps failed */
1628 val &= ~BMCR_SPEED100;
1629 }
1630 cas_phy_write(cp, MII_BMCR, val);
1631 break;
1632 }
1633 default:
1634 break;
1635 }
1636 return 0;
1637 }
1638
1639
1640 /* must be invoked with cp->lock held */
1641 static int cas_mii_link_check(struct cas *cp, const u16 bmsr)
1642 {
1643 int restart;
1644
1645 if (bmsr & BMSR_LSTATUS) {
1646 /* Ok, here we got a link. If we had it due to a forced
1647 * fallback, and we were configured for autoneg, we
1648 * retry a short autoneg pass. If you know your hub is
1649 * broken, use ethtool ;)
1650 */
1651 if ((cp->lstate == link_force_try) &&
1652 (cp->link_cntl & BMCR_ANENABLE)) {
1653 cp->lstate = link_force_ret;
1654 cp->link_transition = LINK_TRANSITION_LINK_CONFIG;
1655 cas_mif_poll(cp, 0);
1656 cp->link_fcntl = cas_phy_read(cp, MII_BMCR);
1657 cp->timer_ticks = 5;
1658 if (cp->opened)
1659 netif_info(cp, link, cp->dev,
1660 "Got link after fallback, retrying autoneg once...\n");
1661 cas_phy_write(cp, MII_BMCR,
1662 cp->link_fcntl | BMCR_ANENABLE |
1663 BMCR_ANRESTART);
1664 cas_mif_poll(cp, 1);
1665
1666 } else if (cp->lstate != link_up) {
1667 cp->lstate = link_up;
1668 cp->link_transition = LINK_TRANSITION_LINK_UP;
1669
1670 if (cp->opened) {
1671 cas_set_link_modes(cp);
1672 netif_carrier_on(cp->dev);
1673 }
1674 }
1675 return 0;
1676 }
1677
1678 /* link not up. if the link was previously up, we restart the
1679 * whole process
1680 */
1681 restart = 0;
1682 if (cp->lstate == link_up) {
1683 cp->lstate = link_down;
1684 cp->link_transition = LINK_TRANSITION_LINK_DOWN;
1685
1686 netif_carrier_off(cp->dev);
1687 if (cp->opened)
1688 netif_info(cp, link, cp->dev, "Link down\n");
1689 restart = 1;
1690
1691 } else if (++cp->timer_ticks > 10)
1692 cas_mdio_link_not_up(cp);
1693
1694 return restart;
1695 }
1696
1697 static int cas_mif_interrupt(struct net_device *dev, struct cas *cp,
1698 u32 status)
1699 {
1700 u32 stat = readl(cp->regs + REG_MIF_STATUS);
1701 u16 bmsr;
1702
1703 /* check for a link change */
1704 if (CAS_VAL(MIF_STATUS_POLL_STATUS, stat) == 0)
1705 return 0;
1706
1707 bmsr = CAS_VAL(MIF_STATUS_POLL_DATA, stat);
1708 return cas_mii_link_check(cp, bmsr);
1709 }
1710
1711 static int cas_pci_interrupt(struct net_device *dev, struct cas *cp,
1712 u32 status)
1713 {
1714 u32 stat = readl(cp->regs + REG_PCI_ERR_STATUS);
1715
1716 if (!stat)
1717 return 0;
1718
1719 netdev_err(dev, "PCI error [%04x:%04x]",
1720 stat, readl(cp->regs + REG_BIM_DIAG));
1721
1722 /* cassini+ has this reserved */
1723 if ((stat & PCI_ERR_BADACK) &&
1724 ((cp->cas_flags & CAS_FLAG_REG_PLUS) == 0))
1725 pr_cont(" <No ACK64# during ABS64 cycle>");
1726
1727 if (stat & PCI_ERR_DTRTO)
1728 pr_cont(" <Delayed transaction timeout>");
1729 if (stat & PCI_ERR_OTHER)
1730 pr_cont(" <other>");
1731 if (stat & PCI_ERR_BIM_DMA_WRITE)
1732 pr_cont(" <BIM DMA 0 write req>");
1733 if (stat & PCI_ERR_BIM_DMA_READ)
1734 pr_cont(" <BIM DMA 0 read req>");
1735 pr_cont("\n");
1736
1737 if (stat & PCI_ERR_OTHER) {
1738 u16 cfg;
1739
1740 /* Interrogate PCI config space for the
1741 * true cause.
1742 */
1743 pci_read_config_word(cp->pdev, PCI_STATUS, &cfg);
1744 netdev_err(dev, "Read PCI cfg space status [%04x]\n", cfg);
1745 if (cfg & PCI_STATUS_PARITY)
1746 netdev_err(dev, "PCI parity error detected\n");
1747 if (cfg & PCI_STATUS_SIG_TARGET_ABORT)
1748 netdev_err(dev, "PCI target abort\n");
1749 if (cfg & PCI_STATUS_REC_TARGET_ABORT)
1750 netdev_err(dev, "PCI master acks target abort\n");
1751 if (cfg & PCI_STATUS_REC_MASTER_ABORT)
1752 netdev_err(dev, "PCI master abort\n");
1753 if (cfg & PCI_STATUS_SIG_SYSTEM_ERROR)
1754 netdev_err(dev, "PCI system error SERR#\n");
1755 if (cfg & PCI_STATUS_DETECTED_PARITY)
1756 netdev_err(dev, "PCI parity error\n");
1757
1758 /* Write the error bits back to clear them. */
1759 cfg &= (PCI_STATUS_PARITY |
1760 PCI_STATUS_SIG_TARGET_ABORT |
1761 PCI_STATUS_REC_TARGET_ABORT |
1762 PCI_STATUS_REC_MASTER_ABORT |
1763 PCI_STATUS_SIG_SYSTEM_ERROR |
1764 PCI_STATUS_DETECTED_PARITY);
1765 pci_write_config_word(cp->pdev, PCI_STATUS, cfg);
1766 }
1767
1768 /* For all PCI errors, we should reset the chip. */
1769 return 1;
1770 }
1771
1772 /* All non-normal interrupt conditions get serviced here.
1773 * Returns non-zero if we should just exit the interrupt
1774 * handler right now (ie. if we reset the card which invalidates
1775 * all of the other original irq status bits).
1776 */
1777 static int cas_abnormal_irq(struct net_device *dev, struct cas *cp,
1778 u32 status)
1779 {
1780 if (status & INTR_RX_TAG_ERROR) {
1781 /* corrupt RX tag framing */
1782 netif_printk(cp, rx_err, KERN_DEBUG, cp->dev,
1783 "corrupt rx tag framing\n");
1784 spin_lock(&cp->stat_lock[0]);
1785 cp->net_stats[0].rx_errors++;
1786 spin_unlock(&cp->stat_lock[0]);
1787 goto do_reset;
1788 }
1789
1790 if (status & INTR_RX_LEN_MISMATCH) {
1791 /* length mismatch. */
1792 netif_printk(cp, rx_err, KERN_DEBUG, cp->dev,
1793 "length mismatch for rx frame\n");
1794 spin_lock(&cp->stat_lock[0]);
1795 cp->net_stats[0].rx_errors++;
1796 spin_unlock(&cp->stat_lock[0]);
1797 goto do_reset;
1798 }
1799
1800 if (status & INTR_PCS_STATUS) {
1801 if (cas_pcs_interrupt(dev, cp, status))
1802 goto do_reset;
1803 }
1804
1805 if (status & INTR_TX_MAC_STATUS) {
1806 if (cas_txmac_interrupt(dev, cp, status))
1807 goto do_reset;
1808 }
1809
1810 if (status & INTR_RX_MAC_STATUS) {
1811 if (cas_rxmac_interrupt(dev, cp, status))
1812 goto do_reset;
1813 }
1814
1815 if (status & INTR_MAC_CTRL_STATUS) {
1816 if (cas_mac_interrupt(dev, cp, status))
1817 goto do_reset;
1818 }
1819
1820 if (status & INTR_MIF_STATUS) {
1821 if (cas_mif_interrupt(dev, cp, status))
1822 goto do_reset;
1823 }
1824
1825 if (status & INTR_PCI_ERROR_STATUS) {
1826 if (cas_pci_interrupt(dev, cp, status))
1827 goto do_reset;
1828 }
1829 return 0;
1830
1831 do_reset:
1832 #if 1
1833 atomic_inc(&cp->reset_task_pending);
1834 atomic_inc(&cp->reset_task_pending_all);
1835 netdev_err(dev, "reset called in cas_abnormal_irq [0x%x]\n", status);
1836 schedule_work(&cp->reset_task);
1837 #else
1838 atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
1839 netdev_err(dev, "reset called in cas_abnormal_irq\n");
1840 schedule_work(&cp->reset_task);
1841 #endif
1842 return 1;
1843 }
1844
1845 /* NOTE: CAS_TABORT returns 1 or 2 so that it can be used when
1846 * determining whether to do a netif_stop/wakeup
1847 */
1848 #define CAS_TABORT(x) (((x)->cas_flags & CAS_FLAG_TARGET_ABORT) ? 2 : 1)
1849 #define CAS_ROUND_PAGE(x) (((x) + PAGE_SIZE - 1) & PAGE_MASK)
1850 static inline int cas_calc_tabort(struct cas *cp, const unsigned long addr,
1851 const int len)
1852 {
1853 unsigned long off = addr + len;
1854
1855 if (CAS_TABORT(cp) == 1)
1856 return 0;
1857 if ((CAS_ROUND_PAGE(off) - off) > TX_TARGET_ABORT_LEN)
1858 return 0;
1859 return TX_TARGET_ABORT_LEN;
1860 }
1861
1862 static inline void cas_tx_ringN(struct cas *cp, int ring, int limit)
1863 {
1864 struct cas_tx_desc *txds;
1865 struct sk_buff **skbs;
1866 struct net_device *dev = cp->dev;
1867 int entry, count;
1868
1869 spin_lock(&cp->tx_lock[ring]);
1870 txds = cp->init_txds[ring];
1871 skbs = cp->tx_skbs[ring];
1872 entry = cp->tx_old[ring];
1873
1874 count = TX_BUFF_COUNT(ring, entry, limit);
1875 while (entry != limit) {
1876 struct sk_buff *skb = skbs[entry];
1877 dma_addr_t daddr;
1878 u32 dlen;
1879 int frag;
1880
1881 if (!skb) {
1882 /* this should never occur */
1883 entry = TX_DESC_NEXT(ring, entry);
1884 continue;
1885 }
1886
1887 /* however, we might get only a partial skb release. */
1888 count -= skb_shinfo(skb)->nr_frags +
1889 + cp->tx_tiny_use[ring][entry].nbufs + 1;
1890 if (count < 0)
1891 break;
1892
1893 netif_printk(cp, tx_done, KERN_DEBUG, cp->dev,
1894 "tx[%d] done, slot %d\n", ring, entry);
1895
1896 skbs[entry] = NULL;
1897 cp->tx_tiny_use[ring][entry].nbufs = 0;
1898
1899 for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) {
1900 struct cas_tx_desc *txd = txds + entry;
1901
1902 daddr = le64_to_cpu(txd->buffer);
1903 dlen = CAS_VAL(TX_DESC_BUFLEN,
1904 le64_to_cpu(txd->control));
1905 pci_unmap_page(cp->pdev, daddr, dlen,
1906 PCI_DMA_TODEVICE);
1907 entry = TX_DESC_NEXT(ring, entry);
1908
1909 /* tiny buffer may follow */
1910 if (cp->tx_tiny_use[ring][entry].used) {
1911 cp->tx_tiny_use[ring][entry].used = 0;
1912 entry = TX_DESC_NEXT(ring, entry);
1913 }
1914 }
1915
1916 spin_lock(&cp->stat_lock[ring]);
1917 cp->net_stats[ring].tx_packets++;
1918 cp->net_stats[ring].tx_bytes += skb->len;
1919 spin_unlock(&cp->stat_lock[ring]);
1920 dev_kfree_skb_irq(skb);
1921 }
1922 cp->tx_old[ring] = entry;
1923
1924 /* this is wrong for multiple tx rings. the net device needs
1925 * multiple queues for this to do the right thing. we wait
1926 * for 2*packets to be available when using tiny buffers
1927 */
1928 if (netif_queue_stopped(dev) &&
1929 (TX_BUFFS_AVAIL(cp, ring) > CAS_TABORT(cp)*(MAX_SKB_FRAGS + 1)))
1930 netif_wake_queue(dev);
1931 spin_unlock(&cp->tx_lock[ring]);
1932 }
1933
1934 static void cas_tx(struct net_device *dev, struct cas *cp,
1935 u32 status)
1936 {
1937 int limit, ring;
1938 #ifdef USE_TX_COMPWB
1939 u64 compwb = le64_to_cpu(cp->init_block->tx_compwb);
1940 #endif
1941 netif_printk(cp, intr, KERN_DEBUG, cp->dev,
1942 "tx interrupt, status: 0x%x, %llx\n",
1943 status, (unsigned long long)compwb);
1944 /* process all the rings */
1945 for (ring = 0; ring < N_TX_RINGS; ring++) {
1946 #ifdef USE_TX_COMPWB
1947 /* use the completion writeback registers */
1948 limit = (CAS_VAL(TX_COMPWB_MSB, compwb) << 8) |
1949 CAS_VAL(TX_COMPWB_LSB, compwb);
1950 compwb = TX_COMPWB_NEXT(compwb);
1951 #else
1952 limit = readl(cp->regs + REG_TX_COMPN(ring));
1953 #endif
1954 if (cp->tx_old[ring] != limit)
1955 cas_tx_ringN(cp, ring, limit);
1956 }
1957 }
1958
1959
1960 static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
1961 int entry, const u64 *words,
1962 struct sk_buff **skbref)
1963 {
1964 int dlen, hlen, len, i, alloclen;
1965 int off, swivel = RX_SWIVEL_OFF_VAL;
1966 struct cas_page *page;
1967 struct sk_buff *skb;
1968 void *addr, *crcaddr;
1969 __sum16 csum;
1970 char *p;
1971
1972 hlen = CAS_VAL(RX_COMP2_HDR_SIZE, words[1]);
1973 dlen = CAS_VAL(RX_COMP1_DATA_SIZE, words[0]);
1974 len = hlen + dlen;
1975
1976 if (RX_COPY_ALWAYS || (words[2] & RX_COMP3_SMALL_PKT))
1977 alloclen = len;
1978 else
1979 alloclen = max(hlen, RX_COPY_MIN);
1980
1981 skb = dev_alloc_skb(alloclen + swivel + cp->crc_size);
1982 if (skb == NULL)
1983 return -1;
1984
1985 *skbref = skb;
1986 skb_reserve(skb, swivel);
1987
1988 p = skb->data;
1989 addr = crcaddr = NULL;
1990 if (hlen) { /* always copy header pages */
1991 i = CAS_VAL(RX_COMP2_HDR_INDEX, words[1]);
1992 page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
1993 off = CAS_VAL(RX_COMP2_HDR_OFF, words[1]) * 0x100 +
1994 swivel;
1995
1996 i = hlen;
1997 if (!dlen) /* attach FCS */
1998 i += cp->crc_size;
1999 pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
2000 PCI_DMA_FROMDEVICE);
2001 addr = cas_page_map(page->buffer);
2002 memcpy(p, addr + off, i);
2003 pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
2004 PCI_DMA_FROMDEVICE);
2005 cas_page_unmap(addr);
2006 RX_USED_ADD(page, 0x100);
2007 p += hlen;
2008 swivel = 0;
2009 }
2010
2011
2012 if (alloclen < (hlen + dlen)) {
2013 skb_frag_t *frag = skb_shinfo(skb)->frags;
2014
2015 /* normal or jumbo packets. we use frags */
2016 i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
2017 page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
2018 off = CAS_VAL(RX_COMP1_DATA_OFF, words[0]) + swivel;
2019
2020 hlen = min(cp->page_size - off, dlen);
2021 if (hlen < 0) {
2022 netif_printk(cp, rx_err, KERN_DEBUG, cp->dev,
2023 "rx page overflow: %d\n", hlen);
2024 dev_kfree_skb_irq(skb);
2025 return -1;
2026 }
2027 i = hlen;
2028 if (i == dlen) /* attach FCS */
2029 i += cp->crc_size;
2030 pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
2031 PCI_DMA_FROMDEVICE);
2032
2033 /* make sure we always copy a header */
2034 swivel = 0;
2035 if (p == (char *) skb->data) { /* not split */
2036 addr = cas_page_map(page->buffer);
2037 memcpy(p, addr + off, RX_COPY_MIN);
2038 pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
2039 PCI_DMA_FROMDEVICE);
2040 cas_page_unmap(addr);
2041 off += RX_COPY_MIN;
2042 swivel = RX_COPY_MIN;
2043 RX_USED_ADD(page, cp->mtu_stride);
2044 } else {
2045 RX_USED_ADD(page, hlen);
2046 }
2047 skb_put(skb, alloclen);
2048
2049 skb_shinfo(skb)->nr_frags++;
2050 skb->data_len += hlen - swivel;
2051 skb->truesize += hlen - swivel;
2052 skb->len += hlen - swivel;
2053
2054 get_page(page->buffer);
2055 frag->page = page->buffer;
2056 frag->page_offset = off;
2057 frag->size = hlen - swivel;
2058
2059 /* any more data? */
2060 if ((words[0] & RX_COMP1_SPLIT_PKT) && ((dlen -= hlen) > 0)) {
2061 hlen = dlen;
2062 off = 0;
2063
2064 i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
2065 page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
2066 pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr,
2067 hlen + cp->crc_size,
2068 PCI_DMA_FROMDEVICE);
2069 pci_dma_sync_single_for_device(cp->pdev, page->dma_addr,
2070 hlen + cp->crc_size,
2071 PCI_DMA_FROMDEVICE);
2072
2073 skb_shinfo(skb)->nr_frags++;
2074 skb->data_len += hlen;
2075 skb->len += hlen;
2076 frag++;
2077
2078 get_page(page->buffer);
2079 frag->page = page->buffer;
2080 frag->page_offset = 0;
2081 frag->size = hlen;
2082 RX_USED_ADD(page, hlen + cp->crc_size);
2083 }
2084
2085 if (cp->crc_size) {
2086 addr = cas_page_map(page->buffer);
2087 crcaddr = addr + off + hlen;
2088 }
2089
2090 } else {
2091 /* copying packet */
2092 if (!dlen)
2093 goto end_copy_pkt;
2094
2095 i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
2096 page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
2097 off = CAS_VAL(RX_COMP1_DATA_OFF, words[0]) + swivel;
2098 hlen = min(cp->page_size - off, dlen);
2099 if (hlen < 0) {
2100 netif_printk(cp, rx_err, KERN_DEBUG, cp->dev,
2101 "rx page overflow: %d\n", hlen);
2102 dev_kfree_skb_irq(skb);
2103 return -1;
2104 }
2105 i = hlen;
2106 if (i == dlen) /* attach FCS */
2107 i += cp->crc_size;
2108 pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr + off, i,
2109 PCI_DMA_FROMDEVICE);
2110 addr = cas_page_map(page->buffer);
2111 memcpy(p, addr + off, i);
2112 pci_dma_sync_single_for_device(cp->pdev, page->dma_addr + off, i,
2113 PCI_DMA_FROMDEVICE);
2114 cas_page_unmap(addr);
2115 if (p == (char *) skb->data) /* not split */
2116 RX_USED_ADD(page, cp->mtu_stride);
2117 else
2118 RX_USED_ADD(page, i);
2119
2120 /* any more data? */
2121 if ((words[0] & RX_COMP1_SPLIT_PKT) && ((dlen -= hlen) > 0)) {
2122 p += hlen;
2123 i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
2124 page = cp->rx_pages[CAS_VAL(RX_INDEX_RING, i)][CAS_VAL(RX_INDEX_NUM, i)];
2125 pci_dma_sync_single_for_cpu(cp->pdev, page->dma_addr,
2126 dlen + cp->crc_size,
2127 PCI_DMA_FROMDEVICE);
2128 addr = cas_page_map(page->buffer);
2129 memcpy(p, addr, dlen + cp->crc_size);
2130 pci_dma_sync_single_for_device(cp->pdev, page->dma_addr,
2131 dlen + cp->crc_size,
2132 PCI_DMA_FROMDEVICE);
2133 cas_page_unmap(addr);
2134 RX_USED_ADD(page, dlen + cp->crc_size);
2135 }
2136 end_copy_pkt:
2137 if (cp->crc_size) {
2138 addr = NULL;
2139 crcaddr = skb->data + alloclen;
2140 }
2141 skb_put(skb, alloclen);
2142 }
2143
2144 csum = (__force __sum16)htons(CAS_VAL(RX_COMP4_TCP_CSUM, words[3]));
2145 if (cp->crc_size) {
2146 /* checksum includes FCS. strip it out. */
2147 csum = csum_fold(csum_partial(crcaddr, cp->crc_size,
2148 csum_unfold(csum)));
2149 if (addr)
2150 cas_page_unmap(addr);
2151 }
2152 skb->protocol = eth_type_trans(skb, cp->dev);
2153 if (skb->protocol == htons(ETH_P_IP)) {
2154 skb->csum = csum_unfold(~csum);
2155 skb->ip_summed = CHECKSUM_COMPLETE;
2156 } else
2157 skb->ip_summed = CHECKSUM_NONE;
2158 return len;
2159 }
2160
2161
2162 /* we can handle up to 64 rx flows at a time. we do the same thing
2163 * as nonreassm except that we batch up the buffers.
2164 * NOTE: we currently just treat each flow as a bunch of packets that
2165 * we pass up. a better way would be to coalesce the packets
2166 * into a jumbo packet. to do that, we need to do the following:
2167 * 1) the first packet will have a clean split between header and
2168 * data. save both.
2169 * 2) each time the next flow packet comes in, extend the
2170 * data length and merge the checksums.
2171 * 3) on flow release, fix up the header.
2172 * 4) make sure the higher layer doesn't care.
2173 * because packets get coalesced, we shouldn't run into fragment count
2174 * issues.
2175 */
2176 static inline void cas_rx_flow_pkt(struct cas *cp, const u64 *words,
2177 struct sk_buff *skb)
2178 {
2179 int flowid = CAS_VAL(RX_COMP3_FLOWID, words[2]) & (N_RX_FLOWS - 1);
2180 struct sk_buff_head *flow = &cp->rx_flows[flowid];
2181
2182 /* this is protected at a higher layer, so no need to
2183 * do any additional locking here. stick the buffer
2184 * at the end.
2185 */
2186 __skb_queue_tail(flow, skb);
2187 if (words[0] & RX_COMP1_RELEASE_FLOW) {
2188 while ((skb = __skb_dequeue(flow))) {
2189 cas_skb_release(skb);
2190 }
2191 }
2192 }
2193
2194 /* put rx descriptor back on ring. if a buffer is in use by a higher
2195 * layer, this will need to put in a replacement.
2196 */
2197 static void cas_post_page(struct cas *cp, const int ring, const int index)
2198 {
2199 cas_page_t *new;
2200 int entry;
2201
2202 entry = cp->rx_old[ring];
2203
2204 new = cas_page_swap(cp, ring, index);
2205 cp->init_rxds[ring][entry].buffer = cpu_to_le64(new->dma_addr);
2206 cp->init_rxds[ring][entry].index =
2207 cpu_to_le64(CAS_BASE(RX_INDEX_NUM, index) |
2208 CAS_BASE(RX_INDEX_RING, ring));
2209
2210 entry = RX_DESC_ENTRY(ring, entry + 1);
2211 cp->rx_old[ring] = entry;
2212
2213 if (entry % 4)
2214 return;
2215
2216 if (ring == 0)
2217 writel(entry, cp->regs + REG_RX_KICK);
2218 else if ((N_RX_DESC_RINGS > 1) &&
2219 (cp->cas_flags & CAS_FLAG_REG_PLUS))
2220 writel(entry, cp->regs + REG_PLUS_RX_KICK1);
2221 }
2222
2223
2224 /* only when things are bad */
2225 static int cas_post_rxds_ringN(struct cas *cp, int ring, int num)
2226 {
2227 unsigned int entry, last, count, released;
2228 int cluster;
2229 cas_page_t **page = cp->rx_pages[ring];
2230
2231 entry = cp->rx_old[ring];
2232
2233 netif_printk(cp, intr, KERN_DEBUG, cp->dev,
2234 "rxd[%d] interrupt, done: %d\n", ring, entry);
2235
2236 cluster = -1;
2237 count = entry & 0x3;
2238 last = RX_DESC_ENTRY(ring, num ? entry + num - 4: entry - 4);
2239 released = 0;
2240 while (entry != last) {
2241 /* make a new buffer if it's still in use */
2242 if (page_count(page[entry]->buffer) > 1) {
2243 cas_page_t *new = cas_page_dequeue(cp);
2244 if (!new) {
2245 /* let the timer know that we need to
2246 * do this again
2247 */
2248 cp->cas_flags |= CAS_FLAG_RXD_POST(ring);
2249 if (!timer_pending(&cp->link_timer))
2250 mod_timer(&cp->link_timer, jiffies +
2251 CAS_LINK_FAST_TIMEOUT);
2252 cp->rx_old[ring] = entry;
2253 cp->rx_last[ring] = num ? num - released : 0;
2254 return -ENOMEM;
2255 }
2256 spin_lock(&cp->rx_inuse_lock);
2257 list_add(&page[entry]->list, &cp->rx_inuse_list);
2258 spin_unlock(&cp->rx_inuse_lock);
2259 cp->init_rxds[ring][entry].buffer =
2260 cpu_to_le64(new->dma_addr);
2261 page[entry] = new;
2262
2263 }
2264
2265 if (++count == 4) {
2266 cluster = entry;
2267 count = 0;
2268 }
2269 released++;
2270 entry = RX_DESC_ENTRY(ring, entry + 1);
2271 }
2272 cp->rx_old[ring] = entry;
2273
2274 if (cluster < 0)
2275 return 0;
2276
2277 if (ring == 0)
2278 writel(cluster, cp->regs + REG_RX_KICK);
2279 else if ((N_RX_DESC_RINGS > 1) &&
2280 (cp->cas_flags & CAS_FLAG_REG_PLUS))
2281 writel(cluster, cp->regs + REG_PLUS_RX_KICK1);
2282 return 0;
2283 }
2284
2285
2286 /* process a completion ring. packets are set up in three basic ways:
2287 * small packets: should be copied header + data in single buffer.
2288 * large packets: header and data in a single buffer.
2289 * split packets: header in a separate buffer from data.
2290 * data may be in multiple pages. data may be > 256
2291 * bytes but in a single page.
2292 *
2293 * NOTE: RX page posting is done in this routine as well. while there's
2294 * the capability of using multiple RX completion rings, it isn't
2295 * really worthwhile due to the fact that the page posting will
2296 * force serialization on the single descriptor ring.
2297 */
2298 static int cas_rx_ringN(struct cas *cp, int ring, int budget)
2299 {
2300 struct cas_rx_comp *rxcs = cp->init_rxcs[ring];
2301 int entry, drops;
2302 int npackets = 0;
2303
2304 netif_printk(cp, intr, KERN_DEBUG, cp->dev,
2305 "rx[%d] interrupt, done: %d/%d\n",
2306 ring,
2307 readl(cp->regs + REG_RX_COMP_HEAD), cp->rx_new[ring]);
2308
2309 entry = cp->rx_new[ring];
2310 drops = 0;
2311 while (1) {
2312 struct cas_rx_comp *rxc = rxcs + entry;
2313 struct sk_buff *uninitialized_var(skb);
2314 int type, len;
2315 u64 words[4];
2316 int i, dring;
2317
2318 words[0] = le64_to_cpu(rxc->word1);
2319 words[1] = le64_to_cpu(rxc->word2);
2320 words[2] = le64_to_cpu(rxc->word3);
2321 words[3] = le64_to_cpu(rxc->word4);
2322
2323 /* don't touch if still owned by hw */
2324 type = CAS_VAL(RX_COMP1_TYPE, words[0]);
2325 if (type == 0)
2326 break;
2327
2328 /* hw hasn't cleared the zero bit yet */
2329 if (words[3] & RX_COMP4_ZERO) {
2330 break;
2331 }
2332
2333 /* get info on the packet */
2334 if (words[3] & (RX_COMP4_LEN_MISMATCH | RX_COMP4_BAD)) {
2335 spin_lock(&cp->stat_lock[ring]);
2336 cp->net_stats[ring].rx_errors++;
2337 if (words[3] & RX_COMP4_LEN_MISMATCH)
2338 cp->net_stats[ring].rx_length_errors++;
2339 if (words[3] & RX_COMP4_BAD)
2340 cp->net_stats[ring].rx_crc_errors++;
2341 spin_unlock(&cp->stat_lock[ring]);
2342
2343 /* We'll just return it to Cassini. */
2344 drop_it:
2345 spin_lock(&cp->stat_lock[ring]);
2346 ++cp->net_stats[ring].rx_dropped;
2347 spin_unlock(&cp->stat_lock[ring]);
2348 goto next;
2349 }
2350
2351 len = cas_rx_process_pkt(cp, rxc, entry, words, &skb);
2352 if (len < 0) {
2353 ++drops;
2354 goto drop_it;
2355 }
2356
2357 /* see if it's a flow re-assembly or not. the driver
2358 * itself handles release back up.
2359 */
2360 if (RX_DONT_BATCH || (type == 0x2)) {
2361 /* non-reassm: these always get released */
2362 cas_skb_release(skb);
2363 } else {
2364 cas_rx_flow_pkt(cp, words, skb);
2365 }
2366
2367 spin_lock(&cp->stat_lock[ring]);
2368 cp->net_stats[ring].rx_packets++;
2369 cp->net_stats[ring].rx_bytes += len;
2370 spin_unlock(&cp->stat_lock[ring]);
2371
2372 next:
2373 npackets++;
2374
2375 /* should it be released? */
2376 if (words[0] & RX_COMP1_RELEASE_HDR) {
2377 i = CAS_VAL(RX_COMP2_HDR_INDEX, words[1]);
2378 dring = CAS_VAL(RX_INDEX_RING, i);
2379 i = CAS_VAL(RX_INDEX_NUM, i);
2380 cas_post_page(cp, dring, i);
2381 }
2382
2383 if (words[0] & RX_COMP1_RELEASE_DATA) {
2384 i = CAS_VAL(RX_COMP1_DATA_INDEX, words[0]);
2385 dring = CAS_VAL(RX_INDEX_RING, i);
2386 i = CAS_VAL(RX_INDEX_NUM, i);
2387 cas_post_page(cp, dring, i);
2388 }
2389
2390 if (words[0] & RX_COMP1_RELEASE_NEXT) {
2391 i = CAS_VAL(RX_COMP2_NEXT_INDEX, words[1]);
2392 dring = CAS_VAL(RX_INDEX_RING, i);
2393 i = CAS_VAL(RX_INDEX_NUM, i);
2394 cas_post_page(cp, dring, i);
2395 }
2396
2397 /* skip to the next entry */
2398 entry = RX_COMP_ENTRY(ring, entry + 1 +
2399 CAS_VAL(RX_COMP1_SKIP, words[0]));
2400 #ifdef USE_NAPI
2401 if (budget && (npackets >= budget))
2402 break;
2403 #endif
2404 }
2405 cp->rx_new[ring] = entry;
2406
2407 if (drops)
2408 netdev_info(cp->dev, "Memory squeeze, deferring packet\n");
2409 return npackets;
2410 }
2411
2412
2413 /* put completion entries back on the ring */
2414 static void cas_post_rxcs_ringN(struct net_device *dev,
2415 struct cas *cp, int ring)
2416 {
2417 struct cas_rx_comp *rxc = cp->init_rxcs[ring];
2418 int last, entry;
2419
2420 last = cp->rx_cur[ring];
2421 entry = cp->rx_new[ring];
2422 netif_printk(cp, intr, KERN_DEBUG, dev,
2423 "rxc[%d] interrupt, done: %d/%d\n",
2424 ring, readl(cp->regs + REG_RX_COMP_HEAD), entry);
2425
2426 /* zero and re-mark descriptors */
2427 while (last != entry) {
2428 cas_rxc_init(rxc + last);
2429 last = RX_COMP_ENTRY(ring, last + 1);
2430 }
2431 cp->rx_cur[ring] = last;
2432
2433 if (ring == 0)
2434 writel(last, cp->regs + REG_RX_COMP_TAIL);
2435 else if (cp->cas_flags & CAS_FLAG_REG_PLUS)
2436 writel(last, cp->regs + REG_PLUS_RX_COMPN_TAIL(ring));
2437 }
2438
2439
2440
2441 /* cassini can use all four PCI interrupts for the completion ring.
2442 * rings 3 and 4 are identical
2443 */
2444 #if defined(USE_PCI_INTC) || defined(USE_PCI_INTD)
2445 static inline void cas_handle_irqN(struct net_device *dev,
2446 struct cas *cp, const u32 status,
2447 const int ring)
2448 {
2449 if (status & (INTR_RX_COMP_FULL_ALT | INTR_RX_COMP_AF_ALT))
2450 cas_post_rxcs_ringN(dev, cp, ring);
2451 }
2452
2453 static irqreturn_t cas_interruptN(int irq, void *dev_id)
2454 {
2455 struct net_device *dev = dev_id;
2456 struct cas *cp = netdev_priv(dev);
2457 unsigned long flags;
2458 int ring;
2459 u32 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(ring));
2460
2461 /* check for shared irq */
2462 if (status == 0)
2463 return IRQ_NONE;
2464
2465 ring = (irq == cp->pci_irq_INTC) ? 2 : 3;
2466 spin_lock_irqsave(&cp->lock, flags);
2467 if (status & INTR_RX_DONE_ALT) { /* handle rx separately */
2468 #ifdef USE_NAPI
2469 cas_mask_intr(cp);
2470 napi_schedule(&cp->napi);
2471 #else
2472 cas_rx_ringN(cp, ring, 0);
2473 #endif
2474 status &= ~INTR_RX_DONE_ALT;
2475 }
2476
2477 if (status)
2478 cas_handle_irqN(dev, cp, status, ring);
2479 spin_unlock_irqrestore(&cp->lock, flags);
2480 return IRQ_HANDLED;
2481 }
2482 #endif
2483
2484 #ifdef USE_PCI_INTB
2485 /* everything but rx packets */
2486 static inline void cas_handle_irq1(struct cas *cp, const u32 status)
2487 {
2488 if (status & INTR_RX_BUF_UNAVAIL_1) {
2489 /* Frame arrived, no free RX buffers available.
2490 * NOTE: we can get this on a link transition. */
2491 cas_post_rxds_ringN(cp, 1, 0);
2492 spin_lock(&cp->stat_lock[1]);
2493 cp->net_stats[1].rx_dropped++;
2494 spin_unlock(&cp->stat_lock[1]);
2495 }
2496
2497 if (status & INTR_RX_BUF_AE_1)
2498 cas_post_rxds_ringN(cp, 1, RX_DESC_RINGN_SIZE(1) -
2499 RX_AE_FREEN_VAL(1));
2500
2501 if (status & (INTR_RX_COMP_AF | INTR_RX_COMP_FULL))
2502 cas_post_rxcs_ringN(cp, 1);
2503 }
2504
2505 /* ring 2 handles a few more events than 3 and 4 */
2506 static irqreturn_t cas_interrupt1(int irq, void *dev_id)
2507 {
2508 struct net_device *dev = dev_id;
2509 struct cas *cp = netdev_priv(dev);
2510 unsigned long flags;
2511 u32 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(1));
2512
2513 /* check for shared interrupt */
2514 if (status == 0)
2515 return IRQ_NONE;
2516
2517 spin_lock_irqsave(&cp->lock, flags);
2518 if (status & INTR_RX_DONE_ALT) { /* handle rx separately */
2519 #ifdef USE_NAPI
2520 cas_mask_intr(cp);
2521 napi_schedule(&cp->napi);
2522 #else
2523 cas_rx_ringN(cp, 1, 0);
2524 #endif
2525 status &= ~INTR_RX_DONE_ALT;
2526 }
2527 if (status)
2528 cas_handle_irq1(cp, status);
2529 spin_unlock_irqrestore(&cp->lock, flags);
2530 return IRQ_HANDLED;
2531 }
2532 #endif
2533
2534 static inline void cas_handle_irq(struct net_device *dev,
2535 struct cas *cp, const u32 status)
2536 {
2537 /* housekeeping interrupts */
2538 if (status & INTR_ERROR_MASK)
2539 cas_abnormal_irq(dev, cp, status);
2540
2541 if (status & INTR_RX_BUF_UNAVAIL) {
2542 /* Frame arrived, no free RX buffers available.
2543 * NOTE: we can get this on a link transition.
2544 */
2545 cas_post_rxds_ringN(cp, 0, 0);
2546 spin_lock(&cp->stat_lock[0]);
2547 cp->net_stats[0].rx_dropped++;
2548 spin_unlock(&cp->stat_lock[0]);
2549 } else if (status & INTR_RX_BUF_AE) {
2550 cas_post_rxds_ringN(cp, 0, RX_DESC_RINGN_SIZE(0) -
2551 RX_AE_FREEN_VAL(0));
2552 }
2553
2554 if (status & (INTR_RX_COMP_AF | INTR_RX_COMP_FULL))
2555 cas_post_rxcs_ringN(dev, cp, 0);
2556 }
2557
2558 static irqreturn_t cas_interrupt(int irq, void *dev_id)
2559 {
2560 struct net_device *dev = dev_id;
2561 struct cas *cp = netdev_priv(dev);
2562 unsigned long flags;
2563 u32 status = readl(cp->regs + REG_INTR_STATUS);
2564
2565 if (status == 0)
2566 return IRQ_NONE;
2567
2568 spin_lock_irqsave(&cp->lock, flags);
2569 if (status & (INTR_TX_ALL | INTR_TX_INTME)) {
2570 cas_tx(dev, cp, status);
2571 status &= ~(INTR_TX_ALL | INTR_TX_INTME);
2572 }
2573
2574 if (status & INTR_RX_DONE) {
2575 #ifdef USE_NAPI
2576 cas_mask_intr(cp);
2577 napi_schedule(&cp->napi);
2578 #else
2579 cas_rx_ringN(cp, 0, 0);
2580 #endif
2581 status &= ~INTR_RX_DONE;
2582 }
2583
2584 if (status)
2585 cas_handle_irq(dev, cp, status);
2586 spin_unlock_irqrestore(&cp->lock, flags);
2587 return IRQ_HANDLED;
2588 }
2589
2590
2591 #ifdef USE_NAPI
2592 static int cas_poll(struct napi_struct *napi, int budget)
2593 {
2594 struct cas *cp = container_of(napi, struct cas, napi);
2595 struct net_device *dev = cp->dev;
2596 int i, enable_intr, credits;
2597 u32 status = readl(cp->regs + REG_INTR_STATUS);
2598 unsigned long flags;
2599
2600 spin_lock_irqsave(&cp->lock, flags);
2601 cas_tx(dev, cp, status);
2602 spin_unlock_irqrestore(&cp->lock, flags);
2603
2604 /* NAPI rx packets. we spread the credits across all of the
2605 * rxc rings
2606 *
2607 * to make sure we're fair with the work we loop through each
2608 * ring N_RX_COMP_RING times with a request of
2609 * budget / N_RX_COMP_RINGS
2610 */
2611 enable_intr = 1;
2612 credits = 0;
2613 for (i = 0; i < N_RX_COMP_RINGS; i++) {
2614 int j;
2615 for (j = 0; j < N_RX_COMP_RINGS; j++) {
2616 credits += cas_rx_ringN(cp, j, budget / N_RX_COMP_RINGS);
2617 if (credits >= budget) {
2618 enable_intr = 0;
2619 goto rx_comp;
2620 }
2621 }
2622 }
2623
2624 rx_comp:
2625 /* final rx completion */
2626 spin_lock_irqsave(&cp->lock, flags);
2627 if (status)
2628 cas_handle_irq(dev, cp, status);
2629
2630 #ifdef USE_PCI_INTB
2631 if (N_RX_COMP_RINGS > 1) {
2632 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(1));
2633 if (status)
2634 cas_handle_irq1(dev, cp, status);
2635 }
2636 #endif
2637
2638 #ifdef USE_PCI_INTC
2639 if (N_RX_COMP_RINGS > 2) {
2640 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(2));
2641 if (status)
2642 cas_handle_irqN(dev, cp, status, 2);
2643 }
2644 #endif
2645
2646 #ifdef USE_PCI_INTD
2647 if (N_RX_COMP_RINGS > 3) {
2648 status = readl(cp->regs + REG_PLUS_INTRN_STATUS(3));
2649 if (status)
2650 cas_handle_irqN(dev, cp, status, 3);
2651 }
2652 #endif
2653 spin_unlock_irqrestore(&cp->lock, flags);
2654 if (enable_intr) {
2655 napi_complete(napi);
2656 cas_unmask_intr(cp);
2657 }
2658 return credits;
2659 }
2660 #endif
2661
2662 #ifdef CONFIG_NET_POLL_CONTROLLER
2663 static void cas_netpoll(struct net_device *dev)
2664 {
2665 struct cas *cp = netdev_priv(dev);
2666
2667 cas_disable_irq(cp, 0);
2668 cas_interrupt(cp->pdev->irq, dev);
2669 cas_enable_irq(cp, 0);
2670
2671 #ifdef USE_PCI_INTB
2672 if (N_RX_COMP_RINGS > 1) {
2673 /* cas_interrupt1(); */
2674 }
2675 #endif
2676 #ifdef USE_PCI_INTC
2677 if (N_RX_COMP_RINGS > 2) {
2678 /* cas_interruptN(); */
2679 }
2680 #endif
2681 #ifdef USE_PCI_INTD
2682 if (N_RX_COMP_RINGS > 3) {
2683 /* cas_interruptN(); */
2684 }
2685 #endif
2686 }
2687 #endif
2688
2689 static void cas_tx_timeout(struct net_device *dev)
2690 {
2691 struct cas *cp = netdev_priv(dev);
2692
2693 netdev_err(dev, "transmit timed out, resetting\n");
2694 if (!cp->hw_running) {
2695 netdev_err(dev, "hrm.. hw not running!\n");
2696 return;
2697 }
2698
2699 netdev_err(dev, "MIF_STATE[%08x]\n",
2700 readl(cp->regs + REG_MIF_STATE_MACHINE));
2701
2702 netdev_err(dev, "MAC_STATE[%08x]\n",
2703 readl(cp->regs + REG_MAC_STATE_MACHINE));
2704
2705 netdev_err(dev, "TX_STATE[%08x:%08x:%08x] FIFO[%08x:%08x:%08x] SM1[%08x] SM2[%08x]\n",
2706 readl(cp->regs + REG_TX_CFG),
2707 readl(cp->regs + REG_MAC_TX_STATUS),
2708 readl(cp->regs + REG_MAC_TX_CFG),
2709 readl(cp->regs + REG_TX_FIFO_PKT_CNT),
2710 readl(cp->regs + REG_TX_FIFO_WRITE_PTR),
2711 readl(cp->regs + REG_TX_FIFO_READ_PTR),
2712 readl(cp->regs + REG_TX_SM_1),
2713 readl(cp->regs + REG_TX_SM_2));
2714
2715 netdev_err(dev, "RX_STATE[%08x:%08x:%08x]\n",
2716 readl(cp->regs + REG_RX_CFG),
2717 readl(cp->regs + REG_MAC_RX_STATUS),
2718 readl(cp->regs + REG_MAC_RX_CFG));
2719
2720 netdev_err(dev, "HP_STATE[%08x:%08x:%08x:%08x]\n",
2721 readl(cp->regs + REG_HP_STATE_MACHINE),
2722 readl(cp->regs + REG_HP_STATUS0),
2723 readl(cp->regs + REG_HP_STATUS1),
2724 readl(cp->regs + REG_HP_STATUS2));
2725
2726 #if 1
2727 atomic_inc(&cp->reset_task_pending);
2728 atomic_inc(&cp->reset_task_pending_all);
2729 schedule_work(&cp->reset_task);
2730 #else
2731 atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
2732 schedule_work(&cp->reset_task);
2733 #endif
2734 }
2735
2736 static inline int cas_intme(int ring, int entry)
2737 {
2738 /* Algorithm: IRQ every 1/2 of descriptors. */
2739 if (!(entry & ((TX_DESC_RINGN_SIZE(ring) >> 1) - 1)))
2740 return 1;
2741 return 0;
2742 }
2743
2744
2745 static void cas_write_txd(struct cas *cp, int ring, int entry,
2746 dma_addr_t mapping, int len, u64 ctrl, int last)
2747 {
2748 struct cas_tx_desc *txd = cp->init_txds[ring] + entry;
2749
2750 ctrl |= CAS_BASE(TX_DESC_BUFLEN, len);
2751 if (cas_intme(ring, entry))
2752 ctrl |= TX_DESC_INTME;
2753 if (last)
2754 ctrl |= TX_DESC_EOF;
2755 txd->control = cpu_to_le64(ctrl);
2756 txd->buffer = cpu_to_le64(mapping);
2757 }
2758
2759 static inline void *tx_tiny_buf(struct cas *cp, const int ring,
2760 const int entry)
2761 {
2762 return cp->tx_tiny_bufs[ring] + TX_TINY_BUF_LEN*entry;
2763 }
2764
2765 static inline dma_addr_t tx_tiny_map(struct cas *cp, const int ring,
2766 const int entry, const int tentry)
2767 {
2768 cp->tx_tiny_use[ring][tentry].nbufs++;
2769 cp->tx_tiny_use[ring][entry].used = 1;
2770 return cp->tx_tiny_dvma[ring] + TX_TINY_BUF_LEN*entry;
2771 }
2772
2773 static inline int cas_xmit_tx_ringN(struct cas *cp, int ring,
2774 struct sk_buff *skb)
2775 {
2776 struct net_device *dev = cp->dev;
2777 int entry, nr_frags, frag, tabort, tentry;
2778 dma_addr_t mapping;
2779 unsigned long flags;
2780 u64 ctrl;
2781 u32 len;
2782
2783 spin_lock_irqsave(&cp->tx_lock[ring], flags);
2784
2785 /* This is a hard error, log it. */
2786 if (TX_BUFFS_AVAIL(cp, ring) <=
2787 CAS_TABORT(cp)*(skb_shinfo(skb)->nr_frags + 1)) {
2788 netif_stop_queue(dev);
2789 spin_unlock_irqrestore(&cp->tx_lock[ring], flags);
2790 netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
2791 return 1;
2792 }
2793
2794 ctrl = 0;
2795 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2796 const u64 csum_start_off = skb_transport_offset(skb);
2797 const u64 csum_stuff_off = csum_start_off + skb->csum_offset;
2798
2799 ctrl = TX_DESC_CSUM_EN |
2800 CAS_BASE(TX_DESC_CSUM_START, csum_start_off) |
2801 CAS_BASE(TX_DESC_CSUM_STUFF, csum_stuff_off);
2802 }
2803
2804 entry = cp->tx_new[ring];
2805 cp->tx_skbs[ring][entry] = skb;
2806
2807 nr_frags = skb_shinfo(skb)->nr_frags;
2808 len = skb_headlen(skb);
2809 mapping = pci_map_page(cp->pdev, virt_to_page(skb->data),
2810 offset_in_page(skb->data), len,
2811 PCI_DMA_TODEVICE);
2812
2813 tentry = entry;
2814 tabort = cas_calc_tabort(cp, (unsigned long) skb->data, len);
2815 if (unlikely(tabort)) {
2816 /* NOTE: len is always > tabort */
2817 cas_write_txd(cp, ring, entry, mapping, len - tabort,
2818 ctrl | TX_DESC_SOF, 0);
2819 entry = TX_DESC_NEXT(ring, entry);
2820
2821 skb_copy_from_linear_data_offset(skb, len - tabort,
2822 tx_tiny_buf(cp, ring, entry), tabort);
2823 mapping = tx_tiny_map(cp, ring, entry, tentry);
2824 cas_write_txd(cp, ring, entry, mapping, tabort, ctrl,
2825 (nr_frags == 0));
2826 } else {
2827 cas_write_txd(cp, ring, entry, mapping, len, ctrl |
2828 TX_DESC_SOF, (nr_frags == 0));
2829 }
2830 entry = TX_DESC_NEXT(ring, entry);
2831
2832 for (frag = 0; frag < nr_frags; frag++) {
2833 skb_frag_t *fragp = &skb_shinfo(skb)->frags[frag];
2834
2835 len = fragp->size;
2836 mapping = pci_map_page(cp->pdev, fragp->page,
2837 fragp->page_offset, len,
2838 PCI_DMA_TODEVICE);
2839
2840 tabort = cas_calc_tabort(cp, fragp->page_offset, len);
2841 if (unlikely(tabort)) {
2842 void *addr;
2843
2844 /* NOTE: len is always > tabort */
2845 cas_write_txd(cp, ring, entry, mapping, len - tabort,
2846 ctrl, 0);
2847 entry = TX_DESC_NEXT(ring, entry);
2848
2849 addr = cas_page_map(fragp->page);
2850 memcpy(tx_tiny_buf(cp, ring, entry),
2851 addr + fragp->page_offset + len - tabort,
2852 tabort);
2853 cas_page_unmap(addr);
2854 mapping = tx_tiny_map(cp, ring, entry, tentry);
2855 len = tabort;
2856 }
2857
2858 cas_write_txd(cp, ring, entry, mapping, len, ctrl,
2859 (frag + 1 == nr_frags));
2860 entry = TX_DESC_NEXT(ring, entry);
2861 }
2862
2863 cp->tx_new[ring] = entry;
2864 if (TX_BUFFS_AVAIL(cp, ring) <= CAS_TABORT(cp)*(MAX_SKB_FRAGS + 1))
2865 netif_stop_queue(dev);
2866
2867 netif_printk(cp, tx_queued, KERN_DEBUG, dev,
2868 "tx[%d] queued, slot %d, skblen %d, avail %d\n",
2869 ring, entry, skb->len, TX_BUFFS_AVAIL(cp, ring));
2870 writel(entry, cp->regs + REG_TX_KICKN(ring));
2871 spin_unlock_irqrestore(&cp->tx_lock[ring], flags);
2872 return 0;
2873 }
2874
2875 static netdev_tx_t cas_start_xmit(struct sk_buff *skb, struct net_device *dev)
2876 {
2877 struct cas *cp = netdev_priv(dev);
2878
2879 /* this is only used as a load-balancing hint, so it doesn't
2880 * need to be SMP safe
2881 */
2882 static int ring;
2883
2884 if (skb_padto(skb, cp->min_frame_size))
2885 return NETDEV_TX_OK;
2886
2887 /* XXX: we need some higher-level QoS hooks to steer packets to
2888 * individual queues.
2889 */
2890 if (cas_xmit_tx_ringN(cp, ring++ & N_TX_RINGS_MASK, skb))
2891 return NETDEV_TX_BUSY;
2892 return NETDEV_TX_OK;
2893 }
2894
2895 static void cas_init_tx_dma(struct cas *cp)
2896 {
2897 u64 desc_dma = cp->block_dvma;
2898 unsigned long off;
2899 u32 val;
2900 int i;
2901
2902 /* set up tx completion writeback registers. must be 8-byte aligned */
2903 #ifdef USE_TX_COMPWB
2904 off = offsetof(struct cas_init_block, tx_compwb);
2905 writel((desc_dma + off) >> 32, cp->regs + REG_TX_COMPWB_DB_HI);
2906 writel((desc_dma + off) & 0xffffffff, cp->regs + REG_TX_COMPWB_DB_LOW);
2907 #endif
2908
2909 /* enable completion writebacks, enable paced mode,
2910 * disable read pipe, and disable pre-interrupt compwbs
2911 */
2912 val = TX_CFG_COMPWB_Q1 | TX_CFG_COMPWB_Q2 |
2913 TX_CFG_COMPWB_Q3 | TX_CFG_COMPWB_Q4 |
2914 TX_CFG_DMA_RDPIPE_DIS | TX_CFG_PACED_MODE |
2915 TX_CFG_INTR_COMPWB_DIS;
2916
2917 /* write out tx ring info and tx desc bases */
2918 for (i = 0; i < MAX_TX_RINGS; i++) {
2919 off = (unsigned long) cp->init_txds[i] -
2920 (unsigned long) cp->init_block;
2921
2922 val |= CAS_TX_RINGN_BASE(i);
2923 writel((desc_dma + off) >> 32, cp->regs + REG_TX_DBN_HI(i));
2924 writel((desc_dma + off) & 0xffffffff, cp->regs +
2925 REG_TX_DBN_LOW(i));
2926 /* don't zero out the kick register here as the system
2927 * will wedge
2928 */
2929 }
2930 writel(val, cp->regs + REG_TX_CFG);
2931
2932 /* program max burst sizes. these numbers should be different
2933 * if doing QoS.
2934 */
2935 #ifdef USE_QOS
2936 writel(0x800, cp->regs + REG_TX_MAXBURST_0);
2937 writel(0x1600, cp->regs + REG_TX_MAXBURST_1);
2938 writel(0x2400, cp->regs + REG_TX_MAXBURST_2);
2939 writel(0x4800, cp->regs + REG_TX_MAXBURST_3);
2940 #else
2941 writel(0x800, cp->regs + REG_TX_MAXBURST_0);
2942 writel(0x800, cp->regs + REG_TX_MAXBURST_1);
2943 writel(0x800, cp->regs + REG_TX_MAXBURST_2);
2944 writel(0x800, cp->regs + REG_TX_MAXBURST_3);
2945 #endif
2946 }
2947
2948 /* Must be invoked under cp->lock. */
2949 static inline void cas_init_dma(struct cas *cp)
2950 {
2951 cas_init_tx_dma(cp);
2952 cas_init_rx_dma(cp);
2953 }
2954
2955 static void cas_process_mc_list(struct cas *cp)
2956 {
2957 u16 hash_table[16];
2958 u32 crc;
2959 struct netdev_hw_addr *ha;
2960 int i = 1;
2961
2962 memset(hash_table, 0, sizeof(hash_table));
2963 netdev_for_each_mc_addr(ha, cp->dev) {
2964 if (i <= CAS_MC_EXACT_MATCH_SIZE) {
2965 /* use the alternate mac address registers for the
2966 * first 15 multicast addresses
2967 */
2968 writel((ha->addr[4] << 8) | ha->addr[5],
2969 cp->regs + REG_MAC_ADDRN(i*3 + 0));
2970 writel((ha->addr[2] << 8) | ha->addr[3],
2971 cp->regs + REG_MAC_ADDRN(i*3 + 1));
2972 writel((ha->addr[0] << 8) | ha->addr[1],
2973 cp->regs + REG_MAC_ADDRN(i*3 + 2));
2974 i++;
2975 }
2976 else {
2977 /* use hw hash table for the next series of
2978 * multicast addresses
2979 */
2980 crc = ether_crc_le(ETH_ALEN, ha->addr);
2981 crc >>= 24;
2982 hash_table[crc >> 4] |= 1 << (15 - (crc & 0xf));
2983 }
2984 }
2985 for (i = 0; i < 16; i++)
2986 writel(hash_table[i], cp->regs + REG_MAC_HASH_TABLEN(i));
2987 }
2988
2989 /* Must be invoked under cp->lock. */
2990 static u32 cas_setup_multicast(struct cas *cp)
2991 {
2992 u32 rxcfg = 0;
2993 int i;
2994
2995 if (cp->dev->flags & IFF_PROMISC) {
2996 rxcfg |= MAC_RX_CFG_PROMISC_EN;
2997
2998 } else if (cp->dev->flags & IFF_ALLMULTI) {
2999 for (i=0; i < 16; i++)
3000 writel(0xFFFF, cp->regs + REG_MAC_HASH_TABLEN(i));
3001 rxcfg |= MAC_RX_CFG_HASH_FILTER_EN;
3002
3003 } else {
3004 cas_process_mc_list(cp);
3005 rxcfg |= MAC_RX_CFG_HASH_FILTER_EN;
3006 }
3007
3008 return rxcfg;
3009 }
3010
3011 /* must be invoked under cp->stat_lock[N_TX_RINGS] */
3012 static void cas_clear_mac_err(struct cas *cp)
3013 {
3014 writel(0, cp->regs + REG_MAC_COLL_NORMAL);
3015 writel(0, cp->regs + REG_MAC_COLL_FIRST);
3016 writel(0, cp->regs + REG_MAC_COLL_EXCESS);
3017 writel(0, cp->regs + REG_MAC_COLL_LATE);
3018 writel(0, cp->regs + REG_MAC_TIMER_DEFER);
3019 writel(0, cp->regs + REG_MAC_ATTEMPTS_PEAK);
3020 writel(0, cp->regs + REG_MAC_RECV_FRAME);
3021 writel(0, cp->regs + REG_MAC_LEN_ERR);
3022 writel(0, cp->regs + REG_MAC_ALIGN_ERR);
3023 writel(0, cp->regs + REG_MAC_FCS_ERR);
3024 writel(0, cp->regs + REG_MAC_RX_CODE_ERR);
3025 }
3026
3027
3028 static void cas_mac_reset(struct cas *cp)
3029 {
3030 int i;
3031
3032 /* do both TX and RX reset */
3033 writel(0x1, cp->regs + REG_MAC_TX_RESET);
3034 writel(0x1, cp->regs + REG_MAC_RX_RESET);
3035
3036 /* wait for TX */
3037 i = STOP_TRIES;
3038 while (i-- > 0) {
3039 if (readl(cp->regs + REG_MAC_TX_RESET) == 0)
3040 break;
3041 udelay(10);
3042 }
3043
3044 /* wait for RX */
3045 i = STOP_TRIES;
3046 while (i-- > 0) {
3047 if (readl(cp->regs + REG_MAC_RX_RESET) == 0)
3048 break;
3049 udelay(10);
3050 }
3051
3052 if (readl(cp->regs + REG_MAC_TX_RESET) |
3053 readl(cp->regs + REG_MAC_RX_RESET))
3054 netdev_err(cp->dev, "mac tx[%d]/rx[%d] reset failed [%08x]\n",
3055 readl(cp->regs + REG_MAC_TX_RESET),
3056 readl(cp->regs + REG_MAC_RX_RESET),
3057 readl(cp->regs + REG_MAC_STATE_MACHINE));
3058 }
3059
3060
3061 /* Must be invoked under cp->lock. */
3062 static void cas_init_mac(struct cas *cp)
3063 {
3064 unsigned char *e = &cp->dev->dev_addr[0];
3065 int i;
3066 #ifdef CONFIG_CASSINI_MULTICAST_REG_WRITE
3067 u32 rxcfg;
3068 #endif
3069 cas_mac_reset(cp);
3070
3071 /* setup core arbitration weight register */
3072 writel(CAWR_RR_DIS, cp->regs + REG_CAWR);
3073
3074 /* XXX Use pci_dma_burst_advice() */
3075 #if !defined(CONFIG_SPARC64) && !defined(CONFIG_ALPHA)
3076 /* set the infinite burst register for chips that don't have
3077 * pci issues.
3078 */
3079 if ((cp->cas_flags & CAS_FLAG_TARGET_ABORT) == 0)
3080 writel(INF_BURST_EN, cp->regs + REG_INF_BURST);
3081 #endif
3082
3083 writel(0x1BF0, cp->regs + REG_MAC_SEND_PAUSE);
3084
3085 writel(0x00, cp->regs + REG_MAC_IPG0);
3086 writel(0x08, cp->regs + REG_MAC_IPG1);
3087 writel(0x04, cp->regs + REG_MAC_IPG2);
3088
3089 /* change later for 802.3z */
3090 writel(0x40, cp->regs + REG_MAC_SLOT_TIME);
3091
3092 /* min frame + FCS */
3093 writel(ETH_ZLEN + 4, cp->regs + REG_MAC_FRAMESIZE_MIN);
3094
3095 /* Ethernet payload + header + FCS + optional VLAN tag. NOTE: we
3096 * specify the maximum frame size to prevent RX tag errors on
3097 * oversized frames.
3098 */
3099 writel(CAS_BASE(MAC_FRAMESIZE_MAX_BURST, 0x2000) |
3100 CAS_BASE(MAC_FRAMESIZE_MAX_FRAME,
3101 (CAS_MAX_MTU + ETH_HLEN + 4 + 4)),
3102 cp->regs + REG_MAC_FRAMESIZE_MAX);
3103
3104 /* NOTE: crc_size is used as a surrogate for half-duplex.
3105 * workaround saturn half-duplex issue by increasing preamble
3106 * size to 65 bytes.
3107 */
3108 if ((cp->cas_flags & CAS_FLAG_SATURN) && cp->crc_size)
3109 writel(0x41, cp->regs + REG_MAC_PA_SIZE);
3110 else
3111 writel(0x07, cp->regs + REG_MAC_PA_SIZE);
3112 writel(0x04, cp->regs + REG_MAC_JAM_SIZE);
3113 writel(0x10, cp->regs + REG_MAC_ATTEMPT_LIMIT);
3114 writel(0x8808, cp->regs + REG_MAC_CTRL_TYPE);
3115
3116 writel((e[5] | (e[4] << 8)) & 0x3ff, cp->regs + REG_MAC_RANDOM_SEED);
3117
3118 writel(0, cp->regs + REG_MAC_ADDR_FILTER0);
3119 writel(0, cp->regs + REG_MAC_ADDR_FILTER1);
3120 writel(0, cp->regs + REG_MAC_ADDR_FILTER2);
3121 writel(0, cp->regs + REG_MAC_ADDR_FILTER2_1_MASK);
3122 writel(0, cp->regs + REG_MAC_ADDR_FILTER0_MASK);
3123
3124 /* setup mac address in perfect filter array */
3125 for (i = 0; i < 45; i++)
3126 writel(0x0, cp->regs + REG_MAC_ADDRN(i));
3127
3128 writel((e[4] << 8) | e[5], cp->regs + REG_MAC_ADDRN(0));
3129 writel((e[2] << 8) | e[3], cp->regs + REG_MAC_ADDRN(1));
3130 writel((e[0] << 8) | e[1], cp->regs + REG_MAC_ADDRN(2));
3131
3132 writel(0x0001, cp->regs + REG_MAC_ADDRN(42));
3133 writel(0xc200, cp->regs + REG_MAC_ADDRN(43));
3134 writel(0x0180, cp->regs + REG_MAC_ADDRN(44));
3135
3136 #ifndef CONFIG_CASSINI_MULTICAST_REG_WRITE
3137 cp->mac_rx_cfg = cas_setup_multicast(cp);
3138 #else
3139 /* WTZ: Do what Adrian did in cas_set_multicast. Doing
3140 * a writel does not seem to be necessary because Cassini
3141 * seems to preserve the configuration when we do the reset.
3142 * If the chip is in trouble, though, it is not clear if we
3143 * can really count on this behavior. cas_set_multicast uses
3144 * spin_lock_irqsave, but we are called only in cas_init_hw and
3145 * cas_init_hw is protected by cas_lock_all, which calls
3146 * spin_lock_irq (so it doesn't need to save the flags, and
3147 * we should be OK for the writel, as that is the only
3148 * difference).
3149 */
3150 cp->mac_rx_cfg = rxcfg = cas_setup_multicast(cp);
3151 writel(rxcfg, cp->regs + REG_MAC_RX_CFG);
3152 #endif
3153 spin_lock(&cp->stat_lock[N_TX_RINGS]);
3154 cas_clear_mac_err(cp);
3155 spin_unlock(&cp->stat_lock[N_TX_RINGS]);
3156
3157 /* Setup MAC interrupts. We want to get all of the interesting
3158 * counter expiration events, but we do not want to hear about
3159 * normal rx/tx as the DMA engine tells us that.
3160 */
3161 writel(MAC_TX_FRAME_XMIT, cp->regs + REG_MAC_TX_MASK);
3162 writel(MAC_RX_FRAME_RECV, cp->regs + REG_MAC_RX_MASK);
3163
3164 /* Don't enable even the PAUSE interrupts for now, we
3165 * make no use of those events other than to record them.
3166 */
3167 writel(0xffffffff, cp->regs + REG_MAC_CTRL_MASK);
3168 }
3169
3170 /* Must be invoked under cp->lock. */
3171 static void cas_init_pause_thresholds(struct cas *cp)
3172 {
3173 /* Calculate pause thresholds. Setting the OFF threshold to the
3174 * full RX fifo size effectively disables PAUSE generation
3175 */
3176 if (cp->rx_fifo_size <= (2 * 1024)) {
3177 cp->rx_pause_off = cp->rx_pause_on = cp->rx_fifo_size;
3178 } else {
3179 int max_frame = (cp->dev->mtu + ETH_HLEN + 4 + 4 + 64) & ~63;
3180 if (max_frame * 3 > cp->rx_fifo_size) {
3181 cp->rx_pause_off = 7104;
3182 cp->rx_pause_on = 960;
3183 } else {
3184 int off = (cp->rx_fifo_size - (max_frame * 2));
3185 int on = off - max_frame;
3186 cp->rx_pause_off = off;
3187 cp->rx_pause_on = on;
3188 }
3189 }
3190 }
3191
3192 static int cas_vpd_match(const void __iomem *p, const char *str)
3193 {
3194 int len = strlen(str) + 1;
3195 int i;
3196
3197 for (i = 0; i < len; i++) {
3198 if (readb(p + i) != str[i])
3199 return 0;
3200 }
3201 return 1;
3202 }
3203
3204
3205 /* get the mac address by reading the vpd information in the rom.
3206 * also get the phy type and determine if there's an entropy generator.
3207 * NOTE: this is a bit convoluted for the following reasons:
3208 * 1) vpd info has order-dependent mac addresses for multinic cards
3209 * 2) the only way to determine the nic order is to use the slot
3210 * number.
3211 * 3) fiber cards don't have bridges, so their slot numbers don't
3212 * mean anything.
3213 * 4) we don't actually know we have a fiber card until after
3214 * the mac addresses are parsed.
3215 */
3216 static int cas_get_vpd_info(struct cas *cp, unsigned char *dev_addr,
3217 const int offset)
3218 {
3219 void __iomem *p = cp->regs + REG_EXPANSION_ROM_RUN_START;
3220 void __iomem *base, *kstart;
3221 int i, len;
3222 int found = 0;
3223 #define VPD_FOUND_MAC 0x01
3224 #define VPD_FOUND_PHY 0x02
3225
3226 int phy_type = CAS_PHY_MII_MDIO0; /* default phy type */
3227 int mac_off = 0;
3228
3229 /* give us access to the PROM */
3230 writel(BIM_LOCAL_DEV_PROM | BIM_LOCAL_DEV_PAD,
3231 cp->regs + REG_BIM_LOCAL_DEV_EN);
3232
3233 /* check for an expansion rom */
3234 if (readb(p) != 0x55 || readb(p + 1) != 0xaa)
3235 goto use_random_mac_addr;
3236
3237 /* search for beginning of vpd */
3238 base = NULL;
3239 for (i = 2; i < EXPANSION_ROM_SIZE; i++) {
3240 /* check for PCIR */
3241 if ((readb(p + i + 0) == 0x50) &&
3242 (readb(p + i + 1) == 0x43) &&
3243 (readb(p + i + 2) == 0x49) &&
3244 (readb(p + i + 3) == 0x52)) {
3245 base = p + (readb(p + i + 8) |
3246 (readb(p + i + 9) << 8));
3247 break;
3248 }
3249 }
3250
3251 if (!base || (readb(base) != 0x82))
3252 goto use_random_mac_addr;
3253
3254 i = (readb(base + 1) | (readb(base + 2) << 8)) + 3;
3255 while (i < EXPANSION_ROM_SIZE) {
3256 if (readb(base + i) != 0x90) /* no vpd found */
3257 goto use_random_mac_addr;
3258
3259 /* found a vpd field */
3260 len = readb(base + i + 1) | (readb(base + i + 2) << 8);
3261
3262 /* extract keywords */
3263 kstart = base + i + 3;
3264 p = kstart;
3265 while ((p - kstart) < len) {
3266 int klen = readb(p + 2);
3267 int j;
3268 char type;
3269
3270 p += 3;
3271
3272 /* look for the following things:
3273 * -- correct length == 29
3274 * 3 (type) + 2 (size) +
3275 * 18 (strlen("local-mac-address") + 1) +
3276 * 6 (mac addr)
3277 * -- VPD Instance 'I'
3278 * -- VPD Type Bytes 'B'
3279 * -- VPD data length == 6
3280 * -- property string == local-mac-address
3281 *
3282 * -- correct length == 24
3283 * 3 (type) + 2 (size) +
3284 * 12 (strlen("entropy-dev") + 1) +
3285 * 7 (strlen("vms110") + 1)
3286 * -- VPD Instance 'I'
3287 * -- VPD Type String 'B'
3288 * -- VPD data length == 7
3289 * -- property string == entropy-dev
3290 *
3291 * -- correct length == 18
3292 * 3 (type) + 2 (size) +
3293 * 9 (strlen("phy-type") + 1) +
3294 * 4 (strlen("pcs") + 1)
3295 * -- VPD Instance 'I'
3296 * -- VPD Type String 'S'
3297 * -- VPD data length == 4
3298 * -- property string == phy-type
3299 *
3300 * -- correct length == 23
3301 * 3 (type) + 2 (size) +
3302 * 14 (strlen("phy-interface") + 1) +
3303 * 4 (strlen("pcs") + 1)
3304 * -- VPD Instance 'I'
3305 * -- VPD Type String 'S'
3306 * -- VPD data length == 4
3307 * -- property string == phy-interface
3308 */
3309 if (readb(p) != 'I')
3310 goto next;
3311
3312 /* finally, check string and length */
3313 type = readb(p + 3);
3314 if (type == 'B') {
3315 if ((klen == 29) && readb(p + 4) == 6 &&
3316 cas_vpd_match(p + 5,
3317 "local-mac-address")) {
3318 if (mac_off++ > offset)
3319 goto next;
3320
3321 /* set mac address */
3322 for (j = 0; j < 6; j++)
3323 dev_addr[j] =
3324 readb(p + 23 + j);
3325 goto found_mac;
3326 }
3327 }
3328
3329 if (type != 'S')
3330 goto next;
3331
3332 #ifdef USE_ENTROPY_DEV
3333 if ((klen == 24) &&
3334 cas_vpd_match(p + 5, "entropy-dev") &&
3335 cas_vpd_match(p + 17, "vms110")) {
3336 cp->cas_flags |= CAS_FLAG_ENTROPY_DEV;
3337 goto next;
3338 }
3339 #endif
3340
3341 if (found & VPD_FOUND_PHY)
3342 goto next;
3343
3344 if ((klen == 18) && readb(p + 4) == 4 &&
3345 cas_vpd_match(p + 5, "phy-type")) {
3346 if (cas_vpd_match(p + 14, "pcs")) {
3347 phy_type = CAS_PHY_SERDES;
3348 goto found_phy;
3349 }
3350 }
3351
3352 if ((klen == 23) && readb(p + 4) == 4 &&
3353 cas_vpd_match(p + 5, "phy-interface")) {
3354 if (cas_vpd_match(p + 19, "pcs")) {
3355 phy_type = CAS_PHY_SERDES;
3356 goto found_phy;
3357 }
3358 }
3359 found_mac:
3360 found |= VPD_FOUND_MAC;
3361 goto next;
3362
3363 found_phy:
3364 found |= VPD_FOUND_PHY;
3365
3366 next:
3367 p += klen;
3368 }
3369 i += len + 3;
3370 }
3371
3372 use_random_mac_addr:
3373 if (found & VPD_FOUND_MAC)
3374 goto done;
3375
3376 /* Sun MAC prefix then 3 random bytes. */
3377 pr_info("MAC address not found in ROM VPD\n");
3378 dev_addr[0] = 0x08;
3379 dev_addr[1] = 0x00;
3380 dev_addr[2] = 0x20;
3381 get_random_bytes(dev_addr + 3, 3);
3382
3383 done:
3384 writel(0, cp->regs + REG_BIM_LOCAL_DEV_EN);
3385 return phy_type;
3386 }
3387
3388 /* check pci invariants */
3389 static void cas_check_pci_invariants(struct cas *cp)
3390 {
3391 struct pci_dev *pdev = cp->pdev;
3392
3393 cp->cas_flags = 0;
3394 if ((pdev->vendor == PCI_VENDOR_ID_SUN) &&
3395 (pdev->device == PCI_DEVICE_ID_SUN_CASSINI)) {
3396 if (pdev->revision >= CAS_ID_REVPLUS)
3397 cp->cas_flags |= CAS_FLAG_REG_PLUS;
3398 if (pdev->revision < CAS_ID_REVPLUS02u)
3399 cp->cas_flags |= CAS_FLAG_TARGET_ABORT;
3400
3401 /* Original Cassini supports HW CSUM, but it's not
3402 * enabled by default as it can trigger TX hangs.
3403 */
3404 if (pdev->revision < CAS_ID_REV2)
3405 cp->cas_flags |= CAS_FLAG_NO_HW_CSUM;
3406 } else {
3407 /* Only sun has original cassini chips. */
3408 cp->cas_flags |= CAS_FLAG_REG_PLUS;
3409
3410 /* We use a flag because the same phy might be externally
3411 * connected.
3412 */
3413 if ((pdev->vendor == PCI_VENDOR_ID_NS) &&
3414 (pdev->device == PCI_DEVICE_ID_NS_SATURN))
3415 cp->cas_flags |= CAS_FLAG_SATURN;
3416 }
3417 }
3418
3419
3420 static int cas_check_invariants(struct cas *cp)
3421 {
3422 struct pci_dev *pdev = cp->pdev;
3423 u32 cfg;
3424 int i;
3425
3426 /* get page size for rx buffers. */
3427 cp->page_order = 0;
3428 #ifdef USE_PAGE_ORDER
3429 if (PAGE_SHIFT < CAS_JUMBO_PAGE_SHIFT) {
3430 /* see if we can allocate larger pages */
3431 struct page *page = alloc_pages(GFP_ATOMIC,
3432 CAS_JUMBO_PAGE_SHIFT -
3433 PAGE_SHIFT);
3434 if (page) {
3435 __free_pages(page, CAS_JUMBO_PAGE_SHIFT - PAGE_SHIFT);
3436 cp->page_order = CAS_JUMBO_PAGE_SHIFT - PAGE_SHIFT;
3437 } else {
3438 printk("MTU limited to %d bytes\n", CAS_MAX_MTU);
3439 }
3440 }
3441 #endif
3442 cp->page_size = (PAGE_SIZE << cp->page_order);
3443
3444 /* Fetch the FIFO configurations. */
3445 cp->tx_fifo_size = readl(cp->regs + REG_TX_FIFO_SIZE) * 64;
3446 cp->rx_fifo_size = RX_FIFO_SIZE;
3447
3448 /* finish phy determination. MDIO1 takes precedence over MDIO0 if
3449 * they're both connected.
3450 */
3451 cp->phy_type = cas_get_vpd_info(cp, cp->dev->dev_addr,
3452 PCI_SLOT(pdev->devfn));
3453 if (cp->phy_type & CAS_PHY_SERDES) {
3454 cp->cas_flags |= CAS_FLAG_1000MB_CAP;
3455 return 0; /* no more checking needed */
3456 }
3457
3458 /* MII */
3459 cfg = readl(cp->regs + REG_MIF_CFG);
3460 if (cfg & MIF_CFG_MDIO_1) {
3461 cp->phy_type = CAS_PHY_MII_MDIO1;
3462 } else if (cfg & MIF_CFG_MDIO_0) {
3463 cp->phy_type = CAS_PHY_MII_MDIO0;
3464 }
3465
3466 cas_mif_poll(cp, 0);
3467 writel(PCS_DATAPATH_MODE_MII, cp->regs + REG_PCS_DATAPATH_MODE);
3468
3469 for (i = 0; i < 32; i++) {
3470 u32 phy_id;
3471 int j;
3472
3473 for (j = 0; j < 3; j++) {
3474 cp->phy_addr = i;
3475 phy_id = cas_phy_read(cp, MII_PHYSID1) << 16;
3476 phy_id |= cas_phy_read(cp, MII_PHYSID2);
3477 if (phy_id && (phy_id != 0xFFFFFFFF)) {
3478 cp->phy_id = phy_id;
3479 goto done;
3480 }
3481 }
3482 }
3483 pr_err("MII phy did not respond [%08x]\n",
3484 readl(cp->regs + REG_MIF_STATE_MACHINE));
3485 return -1;
3486
3487 done:
3488 /* see if we can do gigabit */
3489 cfg = cas_phy_read(cp, MII_BMSR);
3490 if ((cfg & CAS_BMSR_1000_EXTEND) &&
3491 cas_phy_read(cp, CAS_MII_1000_EXTEND))
3492 cp->cas_flags |= CAS_FLAG_1000MB_CAP;
3493 return 0;
3494 }
3495
3496 /* Must be invoked under cp->lock. */
3497 static inline void cas_start_dma(struct cas *cp)
3498 {
3499 int i;
3500 u32 val;
3501 int txfailed = 0;
3502
3503 /* enable dma */
3504 val = readl(cp->regs + REG_TX_CFG) | TX_CFG_DMA_EN;
3505 writel(val, cp->regs + REG_TX_CFG);
3506 val = readl(cp->regs + REG_RX_CFG) | RX_CFG_DMA_EN;
3507 writel(val, cp->regs + REG_RX_CFG);
3508
3509 /* enable the mac */
3510 val = readl(cp->regs + REG_MAC_TX_CFG) | MAC_TX_CFG_EN;
3511 writel(val, cp->regs + REG_MAC_TX_CFG);
3512 val = readl(cp->regs + REG_MAC_RX_CFG) | MAC_RX_CFG_EN;
3513 writel(val, cp->regs + REG_MAC_RX_CFG);
3514
3515 i = STOP_TRIES;
3516 while (i-- > 0) {
3517 val = readl(cp->regs + REG_MAC_TX_CFG);
3518 if ((val & MAC_TX_CFG_EN))
3519 break;
3520 udelay(10);
3521 }
3522 if (i < 0) txfailed = 1;
3523 i = STOP_TRIES;
3524 while (i-- > 0) {
3525 val = readl(cp->regs + REG_MAC_RX_CFG);
3526 if ((val & MAC_RX_CFG_EN)) {
3527 if (txfailed) {
3528 netdev_err(cp->dev,
3529 "enabling mac failed [tx:%08x:%08x]\n",
3530 readl(cp->regs + REG_MIF_STATE_MACHINE),
3531 readl(cp->regs + REG_MAC_STATE_MACHINE));
3532 }
3533 goto enable_rx_done;
3534 }
3535 udelay(10);
3536 }
3537 netdev_err(cp->dev, "enabling mac failed [%s:%08x:%08x]\n",
3538 (txfailed ? "tx,rx" : "rx"),
3539 readl(cp->regs + REG_MIF_STATE_MACHINE),
3540 readl(cp->regs + REG_MAC_STATE_MACHINE));
3541
3542 enable_rx_done:
3543 cas_unmask_intr(cp); /* enable interrupts */
3544 writel(RX_DESC_RINGN_SIZE(0) - 4, cp->regs + REG_RX_KICK);
3545 writel(0, cp->regs + REG_RX_COMP_TAIL);
3546
3547 if (cp->cas_flags & CAS_FLAG_REG_PLUS) {
3548 if (N_RX_DESC_RINGS > 1)
3549 writel(RX_DESC_RINGN_SIZE(1) - 4,
3550 cp->regs + REG_PLUS_RX_KICK1);
3551
3552 for (i = 1; i < N_RX_COMP_RINGS; i++)
3553 writel(0, cp->regs + REG_PLUS_RX_COMPN_TAIL(i));
3554 }
3555 }
3556
3557 /* Must be invoked under cp->lock. */
3558 static void cas_read_pcs_link_mode(struct cas *cp, int *fd, int *spd,
3559 int *pause)
3560 {
3561 u32 val = readl(cp->regs + REG_PCS_MII_LPA);
3562 *fd = (val & PCS_MII_LPA_FD) ? 1 : 0;
3563 *pause = (val & PCS_MII_LPA_SYM_PAUSE) ? 0x01 : 0x00;
3564 if (val & PCS_MII_LPA_ASYM_PAUSE)
3565 *pause |= 0x10;
3566 *spd = 1000;
3567 }
3568
3569 /* Must be invoked under cp->lock. */
3570 static void cas_read_mii_link_mode(struct cas *cp, int *fd, int *spd,
3571 int *pause)
3572 {
3573 u32 val;
3574
3575 *fd = 0;
3576 *spd = 10;
3577 *pause = 0;
3578
3579 /* use GMII registers */
3580 val = cas_phy_read(cp, MII_LPA);
3581 if (val & CAS_LPA_PAUSE)
3582 *pause = 0x01;
3583
3584 if (val & CAS_LPA_ASYM_PAUSE)
3585 *pause |= 0x10;
3586
3587 if (val & LPA_DUPLEX)
3588 *fd = 1;
3589 if (val & LPA_100)
3590 *spd = 100;
3591
3592 if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
3593 val = cas_phy_read(cp, CAS_MII_1000_STATUS);
3594 if (val & (CAS_LPA_1000FULL | CAS_LPA_1000HALF))
3595 *spd = 1000;
3596 if (val & CAS_LPA_1000FULL)
3597 *fd = 1;
3598 }
3599 }
3600
3601 /* A link-up condition has occurred, initialize and enable the
3602 * rest of the chip.
3603 *
3604 * Must be invoked under cp->lock.
3605 */
3606 static void cas_set_link_modes(struct cas *cp)
3607 {
3608 u32 val;
3609 int full_duplex, speed, pause;
3610
3611 full_duplex = 0;
3612 speed = 10;
3613 pause = 0;
3614
3615 if (CAS_PHY_MII(cp->phy_type)) {
3616 cas_mif_poll(cp, 0);
3617 val = cas_phy_read(cp, MII_BMCR);
3618 if (val & BMCR_ANENABLE) {
3619 cas_read_mii_link_mode(cp, &full_duplex, &speed,
3620 &pause);
3621 } else {
3622 if (val & BMCR_FULLDPLX)
3623 full_duplex = 1;
3624
3625 if (val & BMCR_SPEED100)
3626 speed = 100;
3627 else if (val & CAS_BMCR_SPEED1000)
3628 speed = (cp->cas_flags & CAS_FLAG_1000MB_CAP) ?
3629 1000 : 100;
3630 }
3631 cas_mif_poll(cp, 1);
3632
3633 } else {
3634 val = readl(cp->regs + REG_PCS_MII_CTRL);
3635 cas_read_pcs_link_mode(cp, &full_duplex, &speed, &pause);
3636 if ((val & PCS_MII_AUTONEG_EN) == 0) {
3637 if (val & PCS_MII_CTRL_DUPLEX)
3638 full_duplex = 1;
3639 }
3640 }
3641
3642 netif_info(cp, link, cp->dev, "Link up at %d Mbps, %s-duplex\n",
3643 speed, full_duplex ? "full" : "half");
3644
3645 val = MAC_XIF_TX_MII_OUTPUT_EN | MAC_XIF_LINK_LED;
3646 if (CAS_PHY_MII(cp->phy_type)) {
3647 val |= MAC_XIF_MII_BUFFER_OUTPUT_EN;
3648 if (!full_duplex)
3649 val |= MAC_XIF_DISABLE_ECHO;
3650 }
3651 if (full_duplex)
3652 val |= MAC_XIF_FDPLX_LED;
3653 if (speed == 1000)
3654 val |= MAC_XIF_GMII_MODE;
3655 writel(val, cp->regs + REG_MAC_XIF_CFG);
3656
3657 /* deal with carrier and collision detect. */
3658 val = MAC_TX_CFG_IPG_EN;
3659 if (full_duplex) {
3660 val |= MAC_TX_CFG_IGNORE_CARRIER;
3661 val |= MAC_TX_CFG_IGNORE_COLL;
3662 } else {
3663 #ifndef USE_CSMA_CD_PROTO
3664 val |= MAC_TX_CFG_NEVER_GIVE_UP_EN;
3665 val |= MAC_TX_CFG_NEVER_GIVE_UP_LIM;
3666 #endif
3667 }
3668 /* val now set up for REG_MAC_TX_CFG */
3669
3670 /* If gigabit and half-duplex, enable carrier extension
3671 * mode. increase slot time to 512 bytes as well.
3672 * else, disable it and make sure slot time is 64 bytes.
3673 * also activate checksum bug workaround
3674 */
3675 if ((speed == 1000) && !full_duplex) {
3676 writel(val | MAC_TX_CFG_CARRIER_EXTEND,
3677 cp->regs + REG_MAC_TX_CFG);
3678
3679 val = readl(cp->regs + REG_MAC_RX_CFG);
3680 val &= ~MAC_RX_CFG_STRIP_FCS; /* checksum workaround */
3681 writel(val | MAC_RX_CFG_CARRIER_EXTEND,
3682 cp->regs + REG_MAC_RX_CFG);
3683
3684 writel(0x200, cp->regs + REG_MAC_SLOT_TIME);
3685
3686 cp->crc_size = 4;
3687 /* minimum size gigabit frame at half duplex */
3688 cp->min_frame_size = CAS_1000MB_MIN_FRAME;
3689
3690 } else {
3691 writel(val, cp->regs + REG_MAC_TX_CFG);
3692
3693 /* checksum bug workaround. don't strip FCS when in
3694 * half-duplex mode
3695 */
3696 val = readl(cp->regs + REG_MAC_RX_CFG);
3697 if (full_duplex) {
3698 val |= MAC_RX_CFG_STRIP_FCS;
3699 cp->crc_size = 0;
3700 cp->min_frame_size = CAS_MIN_MTU;
3701 } else {
3702 val &= ~MAC_RX_CFG_STRIP_FCS;
3703 cp->crc_size = 4;
3704 cp->min_frame_size = CAS_MIN_FRAME;
3705 }
3706 writel(val & ~MAC_RX_CFG_CARRIER_EXTEND,
3707 cp->regs + REG_MAC_RX_CFG);
3708 writel(0x40, cp->regs + REG_MAC_SLOT_TIME);
3709 }
3710
3711 if (netif_msg_link(cp)) {
3712 if (pause & 0x01) {
3713 netdev_info(cp->dev, "Pause is enabled (rxfifo: %d off: %d on: %d)\n",
3714 cp->rx_fifo_size,
3715 cp->rx_pause_off,
3716 cp->rx_pause_on);
3717 } else if (pause & 0x10) {
3718 netdev_info(cp->dev, "TX pause enabled\n");
3719 } else {
3720 netdev_info(cp->dev, "Pause is disabled\n");
3721 }
3722 }
3723
3724 val = readl(cp->regs + REG_MAC_CTRL_CFG);
3725 val &= ~(MAC_CTRL_CFG_SEND_PAUSE_EN | MAC_CTRL_CFG_RECV_PAUSE_EN);
3726 if (pause) { /* symmetric or asymmetric pause */
3727 val |= MAC_CTRL_CFG_SEND_PAUSE_EN;
3728 if (pause & 0x01) { /* symmetric pause */
3729 val |= MAC_CTRL_CFG_RECV_PAUSE_EN;
3730 }
3731 }
3732 writel(val, cp->regs + REG_MAC_CTRL_CFG);
3733 cas_start_dma(cp);
3734 }
3735
3736 /* Must be invoked under cp->lock. */
3737 static void cas_init_hw(struct cas *cp, int restart_link)
3738 {
3739 if (restart_link)
3740 cas_phy_init(cp);
3741
3742 cas_init_pause_thresholds(cp);
3743 cas_init_mac(cp);
3744 cas_init_dma(cp);
3745
3746 if (restart_link) {
3747 /* Default aneg parameters */
3748 cp->timer_ticks = 0;
3749 cas_begin_auto_negotiation(cp, NULL);
3750 } else if (cp->lstate == link_up) {
3751 cas_set_link_modes(cp);
3752 netif_carrier_on(cp->dev);
3753 }
3754 }
3755
3756 /* Must be invoked under cp->lock. on earlier cassini boards,
3757 * SOFT_0 is tied to PCI reset. we use this to force a pci reset,
3758 * let it settle out, and then restore pci state.
3759 */
3760 static void cas_hard_reset(struct cas *cp)
3761 {
3762 writel(BIM_LOCAL_DEV_SOFT_0, cp->regs + REG_BIM_LOCAL_DEV_EN);
3763 udelay(20);
3764 pci_restore_state(cp->pdev);
3765 }
3766
3767
3768 static void cas_global_reset(struct cas *cp, int blkflag)
3769 {
3770 int limit;
3771
3772 /* issue a global reset. don't use RSTOUT. */
3773 if (blkflag && !CAS_PHY_MII(cp->phy_type)) {
3774 /* For PCS, when the blkflag is set, we should set the
3775 * SW_REST_BLOCK_PCS_SLINK bit to prevent the results of
3776 * the last autonegotiation from being cleared. We'll
3777 * need some special handling if the chip is set into a
3778 * loopback mode.
3779 */
3780 writel((SW_RESET_TX | SW_RESET_RX | SW_RESET_BLOCK_PCS_SLINK),
3781 cp->regs + REG_SW_RESET);
3782 } else {
3783 writel(SW_RESET_TX | SW_RESET_RX, cp->regs + REG_SW_RESET);
3784 }
3785
3786 /* need to wait at least 3ms before polling register */
3787 mdelay(3);
3788
3789 limit = STOP_TRIES;
3790 while (limit-- > 0) {
3791 u32 val = readl(cp->regs + REG_SW_RESET);
3792 if ((val & (SW_RESET_TX | SW_RESET_RX)) == 0)
3793 goto done;
3794 udelay(10);
3795 }
3796 netdev_err(cp->dev, "sw reset failed\n");
3797
3798 done:
3799 /* enable various BIM interrupts */
3800 writel(BIM_CFG_DPAR_INTR_ENABLE | BIM_CFG_RMA_INTR_ENABLE |
3801 BIM_CFG_RTA_INTR_ENABLE, cp->regs + REG_BIM_CFG);
3802
3803 /* clear out pci error status mask for handled errors.
3804 * we don't deal with DMA counter overflows as they happen
3805 * all the time.
3806 */
3807 writel(0xFFFFFFFFU & ~(PCI_ERR_BADACK | PCI_ERR_DTRTO |
3808 PCI_ERR_OTHER | PCI_ERR_BIM_DMA_WRITE |
3809 PCI_ERR_BIM_DMA_READ), cp->regs +
3810 REG_PCI_ERR_STATUS_MASK);
3811
3812 /* set up for MII by default to address mac rx reset timeout
3813 * issue
3814 */
3815 writel(PCS_DATAPATH_MODE_MII, cp->regs + REG_PCS_DATAPATH_MODE);
3816 }
3817
3818 static void cas_reset(struct cas *cp, int blkflag)
3819 {
3820 u32 val;
3821
3822 cas_mask_intr(cp);
3823 cas_global_reset(cp, blkflag);
3824 cas_mac_reset(cp);
3825 cas_entropy_reset(cp);
3826
3827 /* disable dma engines. */
3828 val = readl(cp->regs + REG_TX_CFG);
3829 val &= ~TX_CFG_DMA_EN;
3830 writel(val, cp->regs + REG_TX_CFG);
3831
3832 val = readl(cp->regs + REG_RX_CFG);
3833 val &= ~RX_CFG_DMA_EN;
3834 writel(val, cp->regs + REG_RX_CFG);
3835
3836 /* program header parser */
3837 if ((cp->cas_flags & CAS_FLAG_TARGET_ABORT) ||
3838 (CAS_HP_ALT_FIRMWARE == cas_prog_null)) {
3839 cas_load_firmware(cp, CAS_HP_FIRMWARE);
3840 } else {
3841 cas_load_firmware(cp, CAS_HP_ALT_FIRMWARE);
3842 }
3843
3844 /* clear out error registers */
3845 spin_lock(&cp->stat_lock[N_TX_RINGS]);
3846 cas_clear_mac_err(cp);
3847 spin_unlock(&cp->stat_lock[N_TX_RINGS]);
3848 }
3849
3850 /* Shut down the chip, must be called with pm_mutex held. */
3851 static void cas_shutdown(struct cas *cp)
3852 {
3853 unsigned long flags;
3854
3855 /* Make us not-running to avoid timers respawning */
3856 cp->hw_running = 0;
3857
3858 del_timer_sync(&cp->link_timer);
3859
3860 /* Stop the reset task */
3861 #if 0
3862 while (atomic_read(&cp->reset_task_pending_mtu) ||
3863 atomic_read(&cp->reset_task_pending_spare) ||
3864 atomic_read(&cp->reset_task_pending_all))
3865 schedule();
3866
3867 #else
3868 while (atomic_read(&cp->reset_task_pending))
3869 schedule();
3870 #endif
3871 /* Actually stop the chip */
3872 cas_lock_all_save(cp, flags);
3873 cas_reset(cp, 0);
3874 if (cp->cas_flags & CAS_FLAG_SATURN)
3875 cas_phy_powerdown(cp);
3876 cas_unlock_all_restore(cp, flags);
3877 }
3878
3879 static int cas_change_mtu(struct net_device *dev, int new_mtu)
3880 {
3881 struct cas *cp = netdev_priv(dev);
3882
3883 if (new_mtu < CAS_MIN_MTU || new_mtu > CAS_MAX_MTU)
3884 return -EINVAL;
3885
3886 dev->mtu = new_mtu;
3887 if (!netif_running(dev) || !netif_device_present(dev))
3888 return 0;
3889
3890 /* let the reset task handle it */
3891 #if 1
3892 atomic_inc(&cp->reset_task_pending);
3893 if ((cp->phy_type & CAS_PHY_SERDES)) {
3894 atomic_inc(&cp->reset_task_pending_all);
3895 } else {
3896 atomic_inc(&cp->reset_task_pending_mtu);
3897 }
3898 schedule_work(&cp->reset_task);
3899 #else
3900 atomic_set(&cp->reset_task_pending, (cp->phy_type & CAS_PHY_SERDES) ?
3901 CAS_RESET_ALL : CAS_RESET_MTU);
3902 pr_err("reset called in cas_change_mtu\n");
3903 schedule_work(&cp->reset_task);
3904 #endif
3905
3906 flush_scheduled_work();
3907 return 0;
3908 }
3909
3910 static void cas_clean_txd(struct cas *cp, int ring)
3911 {
3912 struct cas_tx_desc *txd = cp->init_txds[ring];
3913 struct sk_buff *skb, **skbs = cp->tx_skbs[ring];
3914 u64 daddr, dlen;
3915 int i, size;
3916
3917 size = TX_DESC_RINGN_SIZE(ring);
3918 for (i = 0; i < size; i++) {
3919 int frag;
3920
3921 if (skbs[i] == NULL)
3922 continue;
3923
3924 skb = skbs[i];
3925 skbs[i] = NULL;
3926
3927 for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) {
3928 int ent = i & (size - 1);
3929
3930 /* first buffer is never a tiny buffer and so
3931 * needs to be unmapped.
3932 */
3933 daddr = le64_to_cpu(txd[ent].buffer);
3934 dlen = CAS_VAL(TX_DESC_BUFLEN,
3935 le64_to_cpu(txd[ent].control));
3936 pci_unmap_page(cp->pdev, daddr, dlen,
3937 PCI_DMA_TODEVICE);
3938
3939 if (frag != skb_shinfo(skb)->nr_frags) {
3940 i++;
3941
3942 /* next buffer might by a tiny buffer.
3943 * skip past it.
3944 */
3945 ent = i & (size - 1);
3946 if (cp->tx_tiny_use[ring][ent].used)
3947 i++;
3948 }
3949 }
3950 dev_kfree_skb_any(skb);
3951 }
3952
3953 /* zero out tiny buf usage */
3954 memset(cp->tx_tiny_use[ring], 0, size*sizeof(*cp->tx_tiny_use[ring]));
3955 }
3956
3957 /* freed on close */
3958 static inline void cas_free_rx_desc(struct cas *cp, int ring)
3959 {
3960 cas_page_t **page = cp->rx_pages[ring];
3961 int i, size;
3962
3963 size = RX_DESC_RINGN_SIZE(ring);
3964 for (i = 0; i < size; i++) {
3965 if (page[i]) {
3966 cas_page_free(cp, page[i]);
3967 page[i] = NULL;
3968 }
3969 }
3970 }
3971
3972 static void cas_free_rxds(struct cas *cp)
3973 {
3974 int i;
3975
3976 for (i = 0; i < N_RX_DESC_RINGS; i++)
3977 cas_free_rx_desc(cp, i);
3978 }
3979
3980 /* Must be invoked under cp->lock. */
3981 static void cas_clean_rings(struct cas *cp)
3982 {
3983 int i;
3984
3985 /* need to clean all tx rings */
3986 memset(cp->tx_old, 0, sizeof(*cp->tx_old)*N_TX_RINGS);
3987 memset(cp->tx_new, 0, sizeof(*cp->tx_new)*N_TX_RINGS);
3988 for (i = 0; i < N_TX_RINGS; i++)
3989 cas_clean_txd(cp, i);
3990
3991 /* zero out init block */
3992 memset(cp->init_block, 0, sizeof(struct cas_init_block));
3993 cas_clean_rxds(cp);
3994 cas_clean_rxcs(cp);
3995 }
3996
3997 /* allocated on open */
3998 static inline int cas_alloc_rx_desc(struct cas *cp, int ring)
3999 {
4000 cas_page_t **page = cp->rx_pages[ring];
4001 int size, i = 0;
4002
4003 size = RX_DESC_RINGN_SIZE(ring);
4004 for (i = 0; i < size; i++) {
4005 if ((page[i] = cas_page_alloc(cp, GFP_KERNEL)) == NULL)
4006 return -1;
4007 }
4008 return 0;
4009 }
4010
4011 static int cas_alloc_rxds(struct cas *cp)
4012 {
4013 int i;
4014
4015 for (i = 0; i < N_RX_DESC_RINGS; i++) {
4016 if (cas_alloc_rx_desc(cp, i) < 0) {
4017 cas_free_rxds(cp);
4018 return -1;
4019 }
4020 }
4021 return 0;
4022 }
4023
4024 static void cas_reset_task(struct work_struct *work)
4025 {
4026 struct cas *cp = container_of(work, struct cas, reset_task);
4027 #if 0
4028 int pending = atomic_read(&cp->reset_task_pending);
4029 #else
4030 int pending_all = atomic_read(&cp->reset_task_pending_all);
4031 int pending_spare = atomic_read(&cp->reset_task_pending_spare);
4032 int pending_mtu = atomic_read(&cp->reset_task_pending_mtu);
4033
4034 if (pending_all == 0 && pending_spare == 0 && pending_mtu == 0) {
4035 /* We can have more tasks scheduled than actually
4036 * needed.
4037 */
4038 atomic_dec(&cp->reset_task_pending);
4039 return;
4040 }
4041 #endif
4042 /* The link went down, we reset the ring, but keep
4043 * DMA stopped. Use this function for reset
4044 * on error as well.
4045 */
4046 if (cp->hw_running) {
4047 unsigned long flags;
4048
4049 /* Make sure we don't get interrupts or tx packets */
4050 netif_device_detach(cp->dev);
4051 cas_lock_all_save(cp, flags);
4052
4053 if (cp->opened) {
4054 /* We call cas_spare_recover when we call cas_open.
4055 * but we do not initialize the lists cas_spare_recover
4056 * uses until cas_open is called.
4057 */
4058 cas_spare_recover(cp, GFP_ATOMIC);
4059 }
4060 #if 1
4061 /* test => only pending_spare set */
4062 if (!pending_all && !pending_mtu)
4063 goto done;
4064 #else
4065 if (pending == CAS_RESET_SPARE)
4066 goto done;
4067 #endif
4068 /* when pending == CAS_RESET_ALL, the following
4069 * call to cas_init_hw will restart auto negotiation.
4070 * Setting the second argument of cas_reset to
4071 * !(pending == CAS_RESET_ALL) will set this argument
4072 * to 1 (avoiding reinitializing the PHY for the normal
4073 * PCS case) when auto negotiation is not restarted.
4074 */
4075 #if 1
4076 cas_reset(cp, !(pending_all > 0));
4077 if (cp->opened)
4078 cas_clean_rings(cp);
4079 cas_init_hw(cp, (pending_all > 0));
4080 #else
4081 cas_reset(cp, !(pending == CAS_RESET_ALL));
4082 if (cp->opened)
4083 cas_clean_rings(cp);
4084 cas_init_hw(cp, pending == CAS_RESET_ALL);
4085 #endif
4086
4087 done:
4088 cas_unlock_all_restore(cp, flags);
4089 netif_device_attach(cp->dev);
4090 }
4091 #if 1
4092 atomic_sub(pending_all, &cp->reset_task_pending_all);
4093 atomic_sub(pending_spare, &cp->reset_task_pending_spare);
4094 atomic_sub(pending_mtu, &cp->reset_task_pending_mtu);
4095 atomic_dec(&cp->reset_task_pending);
4096 #else
4097 atomic_set(&cp->reset_task_pending, 0);
4098 #endif
4099 }
4100
4101 static void cas_link_timer(unsigned long data)
4102 {
4103 struct cas *cp = (struct cas *) data;
4104 int mask, pending = 0, reset = 0;
4105 unsigned long flags;
4106
4107 if (link_transition_timeout != 0 &&
4108 cp->link_transition_jiffies_valid &&
4109 ((jiffies - cp->link_transition_jiffies) >
4110 (link_transition_timeout))) {
4111 /* One-second counter so link-down workaround doesn't
4112 * cause resets to occur so fast as to fool the switch
4113 * into thinking the link is down.
4114 */
4115 cp->link_transition_jiffies_valid = 0;
4116 }
4117
4118 if (!cp->hw_running)
4119 return;
4120
4121 spin_lock_irqsave(&cp->lock, flags);
4122 cas_lock_tx(cp);
4123 cas_entropy_gather(cp);
4124
4125 /* If the link task is still pending, we just
4126 * reschedule the link timer
4127 */
4128 #if 1
4129 if (atomic_read(&cp->reset_task_pending_all) ||
4130 atomic_read(&cp->reset_task_pending_spare) ||
4131 atomic_read(&cp->reset_task_pending_mtu))
4132 goto done;
4133 #else
4134 if (atomic_read(&cp->reset_task_pending))
4135 goto done;
4136 #endif
4137
4138 /* check for rx cleaning */
4139 if ((mask = (cp->cas_flags & CAS_FLAG_RXD_POST_MASK))) {
4140 int i, rmask;
4141
4142 for (i = 0; i < MAX_RX_DESC_RINGS; i++) {
4143 rmask = CAS_FLAG_RXD_POST(i);
4144 if ((mask & rmask) == 0)
4145 continue;
4146
4147 /* post_rxds will do a mod_timer */
4148 if (cas_post_rxds_ringN(cp, i, cp->rx_last[i]) < 0) {
4149 pending = 1;
4150 continue;
4151 }
4152 cp->cas_flags &= ~rmask;
4153 }
4154 }
4155
4156 if (CAS_PHY_MII(cp->phy_type)) {
4157 u16 bmsr;
4158 cas_mif_poll(cp, 0);
4159 bmsr = cas_phy_read(cp, MII_BMSR);
4160 /* WTZ: Solaris driver reads this twice, but that
4161 * may be due to the PCS case and the use of a
4162 * common implementation. Read it twice here to be
4163 * safe.
4164 */
4165 bmsr = cas_phy_read(cp, MII_BMSR);
4166 cas_mif_poll(cp, 1);
4167 readl(cp->regs + REG_MIF_STATUS); /* avoid dups */
4168 reset = cas_mii_link_check(cp, bmsr);
4169 } else {
4170 reset = cas_pcs_link_check(cp);
4171 }
4172
4173 if (reset)
4174 goto done;
4175
4176 /* check for tx state machine confusion */
4177 if ((readl(cp->regs + REG_MAC_TX_STATUS) & MAC_TX_FRAME_XMIT) == 0) {
4178 u32 val = readl(cp->regs + REG_MAC_STATE_MACHINE);
4179 u32 wptr, rptr;
4180 int tlm = CAS_VAL(MAC_SM_TLM, val);
4181
4182 if (((tlm == 0x5) || (tlm == 0x3)) &&
4183 (CAS_VAL(MAC_SM_ENCAP_SM, val) == 0)) {
4184 netif_printk(cp, tx_err, KERN_DEBUG, cp->dev,
4185 "tx err: MAC_STATE[%08x]\n", val);
4186 reset = 1;
4187 goto done;
4188 }
4189
4190 val = readl(cp->regs + REG_TX_FIFO_PKT_CNT);
4191 wptr = readl(cp->regs + REG_TX_FIFO_WRITE_PTR);
4192 rptr = readl(cp->regs + REG_TX_FIFO_READ_PTR);
4193 if ((val == 0) && (wptr != rptr)) {
4194 netif_printk(cp, tx_err, KERN_DEBUG, cp->dev,
4195 "tx err: TX_FIFO[%08x:%08x:%08x]\n",
4196 val, wptr, rptr);
4197 reset = 1;
4198 }
4199
4200 if (reset)
4201 cas_hard_reset(cp);
4202 }
4203
4204 done:
4205 if (reset) {
4206 #if 1
4207 atomic_inc(&cp->reset_task_pending);
4208 atomic_inc(&cp->reset_task_pending_all);
4209 schedule_work(&cp->reset_task);
4210 #else
4211 atomic_set(&cp->reset_task_pending, CAS_RESET_ALL);
4212 pr_err("reset called in cas_link_timer\n");
4213 schedule_work(&cp->reset_task);
4214 #endif
4215 }
4216
4217 if (!pending)
4218 mod_timer(&cp->link_timer, jiffies + CAS_LINK_TIMEOUT);
4219 cas_unlock_tx(cp);
4220 spin_unlock_irqrestore(&cp->lock, flags);
4221 }
4222
4223 /* tiny buffers are used to avoid target abort issues with
4224 * older cassini's
4225 */
4226 static void cas_tx_tiny_free(struct cas *cp)
4227 {
4228 struct pci_dev *pdev = cp->pdev;
4229 int i;
4230
4231 for (i = 0; i < N_TX_RINGS; i++) {
4232 if (!cp->tx_tiny_bufs[i])
4233 continue;
4234
4235 pci_free_consistent(pdev, TX_TINY_BUF_BLOCK,
4236 cp->tx_tiny_bufs[i],
4237 cp->tx_tiny_dvma[i]);
4238 cp->tx_tiny_bufs[i] = NULL;
4239 }
4240 }
4241
4242 static int cas_tx_tiny_alloc(struct cas *cp)
4243 {
4244 struct pci_dev *pdev = cp->pdev;
4245 int i;
4246
4247 for (i = 0; i < N_TX_RINGS; i++) {
4248 cp->tx_tiny_bufs[i] =
4249 pci_alloc_consistent(pdev, TX_TINY_BUF_BLOCK,
4250 &cp->tx_tiny_dvma[i]);
4251 if (!cp->tx_tiny_bufs[i]) {
4252 cas_tx_tiny_free(cp);
4253 return -1;
4254 }
4255 }
4256 return 0;
4257 }
4258
4259
4260 static int cas_open(struct net_device *dev)
4261 {
4262 struct cas *cp = netdev_priv(dev);
4263 int hw_was_up, err;
4264 unsigned long flags;
4265
4266 mutex_lock(&cp->pm_mutex);
4267
4268 hw_was_up = cp->hw_running;
4269
4270 /* The power-management mutex protects the hw_running
4271 * etc. state so it is safe to do this bit without cp->lock
4272 */
4273 if (!cp->hw_running) {
4274 /* Reset the chip */
4275 cas_lock_all_save(cp, flags);
4276 /* We set the second arg to cas_reset to zero
4277 * because cas_init_hw below will have its second
4278 * argument set to non-zero, which will force
4279 * autonegotiation to start.
4280 */
4281 cas_reset(cp, 0);
4282 cp->hw_running = 1;
4283 cas_unlock_all_restore(cp, flags);
4284 }
4285
4286 err = -ENOMEM;
4287 if (cas_tx_tiny_alloc(cp) < 0)
4288 goto err_unlock;
4289
4290 /* alloc rx descriptors */
4291 if (cas_alloc_rxds(cp) < 0)
4292 goto err_tx_tiny;
4293
4294 /* allocate spares */
4295 cas_spare_init(cp);
4296 cas_spare_recover(cp, GFP_KERNEL);
4297
4298 /* We can now request the interrupt as we know it's masked
4299 * on the controller. cassini+ has up to 4 interrupts
4300 * that can be used, but you need to do explicit pci interrupt
4301 * mapping to expose them
4302 */
4303 if (request_irq(cp->pdev->irq, cas_interrupt,
4304 IRQF_SHARED, dev->name, (void *) dev)) {
4305 netdev_err(cp->dev, "failed to request irq !\n");
4306 err = -EAGAIN;
4307 goto err_spare;
4308 }
4309
4310 #ifdef USE_NAPI
4311 napi_enable(&cp->napi);
4312 #endif
4313 /* init hw */
4314 cas_lock_all_save(cp, flags);
4315 cas_clean_rings(cp);
4316 cas_init_hw(cp, !hw_was_up);
4317 cp->opened = 1;
4318 cas_unlock_all_restore(cp, flags);
4319
4320 netif_start_queue(dev);
4321 mutex_unlock(&cp->pm_mutex);
4322 return 0;
4323
4324 err_spare:
4325 cas_spare_free(cp);
4326 cas_free_rxds(cp);
4327 err_tx_tiny:
4328 cas_tx_tiny_free(cp);
4329 err_unlock:
4330 mutex_unlock(&cp->pm_mutex);
4331 return err;
4332 }
4333
4334 static int cas_close(struct net_device *dev)
4335 {
4336 unsigned long flags;
4337 struct cas *cp = netdev_priv(dev);
4338
4339 #ifdef USE_NAPI
4340 napi_disable(&cp->napi);
4341 #endif
4342 /* Make sure we don't get distracted by suspend/resume */
4343 mutex_lock(&cp->pm_mutex);
4344
4345 netif_stop_queue(dev);
4346
4347 /* Stop traffic, mark us closed */
4348 cas_lock_all_save(cp, flags);
4349 cp->opened = 0;
4350 cas_reset(cp, 0);
4351 cas_phy_init(cp);
4352 cas_begin_auto_negotiation(cp, NULL);
4353 cas_clean_rings(cp);
4354 cas_unlock_all_restore(cp, flags);
4355
4356 free_irq(cp->pdev->irq, (void *) dev);
4357 cas_spare_free(cp);
4358 cas_free_rxds(cp);
4359 cas_tx_tiny_free(cp);
4360 mutex_unlock(&cp->pm_mutex);
4361 return 0;
4362 }
4363
4364 static struct {
4365 const char name[ETH_GSTRING_LEN];
4366 } ethtool_cassini_statnames[] = {
4367 {"collisions"},
4368 {"rx_bytes"},
4369 {"rx_crc_errors"},
4370 {"rx_dropped"},
4371 {"rx_errors"},
4372 {"rx_fifo_errors"},
4373 {"rx_frame_errors"},
4374 {"rx_length_errors"},
4375 {"rx_over_errors"},
4376 {"rx_packets"},
4377 {"tx_aborted_errors"},
4378 {"tx_bytes"},
4379 {"tx_dropped"},
4380 {"tx_errors"},
4381 {"tx_fifo_errors"},
4382 {"tx_packets"}
4383 };
4384 #define CAS_NUM_STAT_KEYS ARRAY_SIZE(ethtool_cassini_statnames)
4385
4386 static struct {
4387 const int offsets; /* neg. values for 2nd arg to cas_read_phy */
4388 } ethtool_register_table[] = {
4389 {-MII_BMSR},
4390 {-MII_BMCR},
4391 {REG_CAWR},
4392 {REG_INF_BURST},
4393 {REG_BIM_CFG},
4394 {REG_RX_CFG},
4395 {REG_HP_CFG},
4396 {REG_MAC_TX_CFG},
4397 {REG_MAC_RX_CFG},
4398 {REG_MAC_CTRL_CFG},
4399 {REG_MAC_XIF_CFG},
4400 {REG_MIF_CFG},
4401 {REG_PCS_CFG},
4402 {REG_SATURN_PCFG},
4403 {REG_PCS_MII_STATUS},
4404 {REG_PCS_STATE_MACHINE},
4405 {REG_MAC_COLL_EXCESS},
4406 {REG_MAC_COLL_LATE}
4407 };
4408 #define CAS_REG_LEN ARRAY_SIZE(ethtool_register_table)
4409 #define CAS_MAX_REGS (sizeof (u32)*CAS_REG_LEN)
4410
4411 static void cas_read_regs(struct cas *cp, u8 *ptr, int len)
4412 {
4413 u8 *p;
4414 int i;
4415 unsigned long flags;
4416
4417 spin_lock_irqsave(&cp->lock, flags);
4418 for (i = 0, p = ptr; i < len ; i ++, p += sizeof(u32)) {
4419 u16 hval;
4420 u32 val;
4421 if (ethtool_register_table[i].offsets < 0) {
4422 hval = cas_phy_read(cp,
4423 -ethtool_register_table[i].offsets);
4424 val = hval;
4425 } else {
4426 val= readl(cp->regs+ethtool_register_table[i].offsets);
4427 }
4428 memcpy(p, (u8 *)&val, sizeof(u32));
4429 }
4430 spin_unlock_irqrestore(&cp->lock, flags);
4431 }
4432
4433 static struct net_device_stats *cas_get_stats(struct net_device *dev)
4434 {
4435 struct cas *cp = netdev_priv(dev);
4436 struct net_device_stats *stats = cp->net_stats;
4437 unsigned long flags;
4438 int i;
4439 unsigned long tmp;
4440
4441 /* we collate all of the stats into net_stats[N_TX_RING] */
4442 if (!cp->hw_running)
4443 return stats + N_TX_RINGS;
4444
4445 /* collect outstanding stats */
4446 /* WTZ: the Cassini spec gives these as 16 bit counters but
4447 * stored in 32-bit words. Added a mask of 0xffff to be safe,
4448 * in case the chip somehow puts any garbage in the other bits.
4449 * Also, counter usage didn't seem to mach what Adrian did
4450 * in the parts of the code that set these quantities. Made
4451 * that consistent.
4452 */
4453 spin_lock_irqsave(&cp->stat_lock[N_TX_RINGS], flags);
4454 stats[N_TX_RINGS].rx_crc_errors +=
4455 readl(cp->regs + REG_MAC_FCS_ERR) & 0xffff;
4456 stats[N_TX_RINGS].rx_frame_errors +=
4457 readl(cp->regs + REG_MAC_ALIGN_ERR) &0xffff;
4458 stats[N_TX_RINGS].rx_length_errors +=
4459 readl(cp->regs + REG_MAC_LEN_ERR) & 0xffff;
4460 #if 1
4461 tmp = (readl(cp->regs + REG_MAC_COLL_EXCESS) & 0xffff) +
4462 (readl(cp->regs + REG_MAC_COLL_LATE) & 0xffff);
4463 stats[N_TX_RINGS].tx_aborted_errors += tmp;
4464 stats[N_TX_RINGS].collisions +=
4465 tmp + (readl(cp->regs + REG_MAC_COLL_NORMAL) & 0xffff);
4466 #else
4467 stats[N_TX_RINGS].tx_aborted_errors +=
4468 readl(cp->regs + REG_MAC_COLL_EXCESS);
4469 stats[N_TX_RINGS].collisions += readl(cp->regs + REG_MAC_COLL_EXCESS) +
4470 readl(cp->regs + REG_MAC_COLL_LATE);
4471 #endif
4472 cas_clear_mac_err(cp);
4473
4474 /* saved bits that are unique to ring 0 */
4475 spin_lock(&cp->stat_lock[0]);
4476 stats[N_TX_RINGS].collisions += stats[0].collisions;
4477 stats[N_TX_RINGS].rx_over_errors += stats[0].rx_over_errors;
4478 stats[N_TX_RINGS].rx_frame_errors += stats[0].rx_frame_errors;
4479 stats[N_TX_RINGS].rx_fifo_errors += stats[0].rx_fifo_errors;
4480 stats[N_TX_RINGS].tx_aborted_errors += stats[0].tx_aborted_errors;
4481 stats[N_TX_RINGS].tx_fifo_errors += stats[0].tx_fifo_errors;
4482 spin_unlock(&cp->stat_lock[0]);
4483
4484 for (i = 0; i < N_TX_RINGS; i++) {
4485 spin_lock(&cp->stat_lock[i]);
4486 stats[N_TX_RINGS].rx_length_errors +=
4487 stats[i].rx_length_errors;
4488 stats[N_TX_RINGS].rx_crc_errors += stats[i].rx_crc_errors;
4489 stats[N_TX_RINGS].rx_packets += stats[i].rx_packets;
4490 stats[N_TX_RINGS].tx_packets += stats[i].tx_packets;
4491 stats[N_TX_RINGS].rx_bytes += stats[i].rx_bytes;
4492 stats[N_TX_RINGS].tx_bytes += stats[i].tx_bytes;
4493 stats[N_TX_RINGS].rx_errors += stats[i].rx_errors;
4494 stats[N_TX_RINGS].tx_errors += stats[i].tx_errors;
4495 stats[N_TX_RINGS].rx_dropped += stats[i].rx_dropped;
4496 stats[N_TX_RINGS].tx_dropped += stats[i].tx_dropped;
4497 memset(stats + i, 0, sizeof(struct net_device_stats));
4498 spin_unlock(&cp->stat_lock[i]);
4499 }
4500 spin_unlock_irqrestore(&cp->stat_lock[N_TX_RINGS], flags);
4501 return stats + N_TX_RINGS;
4502 }
4503
4504
4505 static void cas_set_multicast(struct net_device *dev)
4506 {
4507 struct cas *cp = netdev_priv(dev);
4508 u32 rxcfg, rxcfg_new;
4509 unsigned long flags;
4510 int limit = STOP_TRIES;
4511
4512 if (!cp->hw_running)
4513 return;
4514
4515 spin_lock_irqsave(&cp->lock, flags);
4516 rxcfg = readl(cp->regs + REG_MAC_RX_CFG);
4517
4518 /* disable RX MAC and wait for completion */
4519 writel(rxcfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
4520 while (readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_EN) {
4521 if (!limit--)
4522 break;
4523 udelay(10);
4524 }
4525
4526 /* disable hash filter and wait for completion */
4527 limit = STOP_TRIES;
4528 rxcfg &= ~(MAC_RX_CFG_PROMISC_EN | MAC_RX_CFG_HASH_FILTER_EN);
4529 writel(rxcfg & ~MAC_RX_CFG_EN, cp->regs + REG_MAC_RX_CFG);
4530 while (readl(cp->regs + REG_MAC_RX_CFG) & MAC_RX_CFG_HASH_FILTER_EN) {
4531 if (!limit--)
4532 break;
4533 udelay(10);
4534 }
4535
4536 /* program hash filters */
4537 cp->mac_rx_cfg = rxcfg_new = cas_setup_multicast(cp);
4538 rxcfg |= rxcfg_new;
4539 writel(rxcfg, cp->regs + REG_MAC_RX_CFG);
4540 spin_unlock_irqrestore(&cp->lock, flags);
4541 }
4542
4543 static void cas_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
4544 {
4545 struct cas *cp = netdev_priv(dev);
4546 strncpy(info->driver, DRV_MODULE_NAME, ETHTOOL_BUSINFO_LEN);
4547 strncpy(info->version, DRV_MODULE_VERSION, ETHTOOL_BUSINFO_LEN);
4548 info->fw_version[0] = '\0';
4549 strncpy(info->bus_info, pci_name(cp->pdev), ETHTOOL_BUSINFO_LEN);
4550 info->regdump_len = cp->casreg_len < CAS_MAX_REGS ?
4551 cp->casreg_len : CAS_MAX_REGS;
4552 info->n_stats = CAS_NUM_STAT_KEYS;
4553 }
4554
4555 static int cas_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
4556 {
4557 struct cas *cp = netdev_priv(dev);
4558 u16 bmcr;
4559 int full_duplex, speed, pause;
4560 unsigned long flags;
4561 enum link_state linkstate = link_up;
4562
4563 cmd->advertising = 0;
4564 cmd->supported = SUPPORTED_Autoneg;
4565 if (cp->cas_flags & CAS_FLAG_1000MB_CAP) {
4566 cmd->supported |= SUPPORTED_1000baseT_Full;
4567 cmd->advertising |= ADVERTISED_1000baseT_Full;
4568 }
4569
4570 /* Record PHY settings if HW is on. */
4571 spin_lock_irqsave(&cp->lock, flags);
4572 bmcr = 0;
4573 linkstate = cp->lstate;
4574 if (CAS_PHY_MII(cp->phy_type)) {
4575 cmd->port = PORT_MII;
4576 cmd->transceiver = (cp->cas_flags & CAS_FLAG_SATURN) ?
4577 XCVR_INTERNAL : XCVR_EXTERNAL;
4578 cmd->phy_address = cp->phy_addr;
4579 cmd->advertising |= ADVERTISED_TP | ADVERTISED_MII |
4580 ADVERTISED_10baseT_Half |
4581 ADVERTISED_10baseT_Full |
4582 ADVERTISED_100baseT_Half |
4583 ADVERTISED_100baseT_Full;
4584
4585 cmd->supported |=
4586 (SUPPORTED_10baseT_Half |
4587 SUPPORTED_10baseT_Full |
4588 SUPPORTED_100baseT_Half |
4589 SUPPORTED_100baseT_Full |
4590 SUPPORTED_TP | SUPPORTED_MII);
4591
4592 if (cp->hw_running) {
4593 cas_mif_poll(cp, 0);
4594 bmcr = cas_phy_read(cp, MII_BMCR);
4595 cas_read_mii_link_mode(cp, &full_duplex,
4596 &speed, &pause);
4597 cas_mif_poll(cp, 1);
4598 }
4599
4600 } else {
4601 cmd->port = PORT_FIBRE;
4602 cmd->transceiver = XCVR_INTERNAL;
4603 cmd->phy_address = 0;
4604 cmd->supported |= SUPPORTED_FIBRE;
4605 cmd->advertising |= ADVERTISED_FIBRE;
4606
4607 if (cp->hw_running) {
4608 /* pcs uses the same bits as mii */
4609 bmcr = readl(cp->regs + REG_PCS_MII_CTRL);
4610 cas_read_pcs_link_mode(cp, &full_duplex,
4611 &speed, &pause);
4612 }
4613 }
4614 spin_unlock_irqrestore(&cp->lock, flags);
4615
4616 if (bmcr & BMCR_ANENABLE) {
4617 cmd->advertising |= ADVERTISED_Autoneg;
4618 cmd->autoneg = AUTONEG_ENABLE;
4619 cmd->speed = ((speed == 10) ?
4620 SPEED_10 :
4621 ((speed == 1000) ?
4622 SPEED_1000 : SPEED_100));
4623 cmd->duplex = full_duplex ? DUPLEX_FULL : DUPLEX_HALF;
4624 } else {
4625 cmd->autoneg = AUTONEG_DISABLE;
4626 cmd->speed =
4627 (bmcr & CAS_BMCR_SPEED1000) ?
4628 SPEED_1000 :
4629 ((bmcr & BMCR_SPEED100) ? SPEED_100:
4630 SPEED_10);
4631 cmd->duplex =
4632 (bmcr & BMCR_FULLDPLX) ?
4633 DUPLEX_FULL : DUPLEX_HALF;
4634 }
4635 if (linkstate != link_up) {
4636 /* Force these to "unknown" if the link is not up and
4637 * autonogotiation in enabled. We can set the link
4638 * speed to 0, but not cmd->duplex,
4639 * because its legal values are 0 and 1. Ethtool will
4640 * print the value reported in parentheses after the
4641 * word "Unknown" for unrecognized values.
4642 *
4643 * If in forced mode, we report the speed and duplex
4644 * settings that we configured.
4645 */
4646 if (cp->link_cntl & BMCR_ANENABLE) {
4647 cmd->speed = 0;
4648 cmd->duplex = 0xff;
4649 } else {
4650 cmd->speed = SPEED_10;
4651 if (cp->link_cntl & BMCR_SPEED100) {
4652 cmd->speed = SPEED_100;
4653 } else if (cp->link_cntl & CAS_BMCR_SPEED1000) {
4654 cmd->speed = SPEED_1000;
4655 }
4656 cmd->duplex = (cp->link_cntl & BMCR_FULLDPLX)?
4657 DUPLEX_FULL : DUPLEX_HALF;
4658 }
4659 }
4660 return 0;
4661 }
4662
4663 static int cas_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
4664 {
4665 struct cas *cp = netdev_priv(dev);
4666 unsigned long flags;
4667
4668 /* Verify the settings we care about. */
4669 if (cmd->autoneg != AUTONEG_ENABLE &&
4670 cmd->autoneg != AUTONEG_DISABLE)
4671 return -EINVAL;
4672
4673 if (cmd->autoneg == AUTONEG_DISABLE &&
4674 ((cmd->speed != SPEED_1000 &&
4675 cmd->speed != SPEED_100 &&
4676 cmd->speed != SPEED_10) ||
4677 (cmd->duplex != DUPLEX_HALF &&
4678 cmd->duplex != DUPLEX_FULL)))
4679 return -EINVAL;
4680
4681 /* Apply settings and restart link process. */
4682 spin_lock_irqsave(&cp->lock, flags);
4683 cas_begin_auto_negotiation(cp, cmd);
4684 spin_unlock_irqrestore(&cp->lock, flags);
4685 return 0;
4686 }
4687
4688 static int cas_nway_reset(struct net_device *dev)
4689 {
4690 struct cas *cp = netdev_priv(dev);
4691 unsigned long flags;
4692
4693 if ((cp->link_cntl & BMCR_ANENABLE) == 0)
4694 return -EINVAL;
4695
4696 /* Restart link process. */
4697 spin_lock_irqsave(&cp->lock, flags);
4698 cas_begin_auto_negotiation(cp, NULL);
4699 spin_unlock_irqrestore(&cp->lock, flags);
4700
4701 return 0;
4702 }
4703
4704 static u32 cas_get_link(struct net_device *dev)
4705 {
4706 struct cas *cp = netdev_priv(dev);
4707 return cp->lstate == link_up;
4708 }
4709
4710 static u32 cas_get_msglevel(struct net_device *dev)
4711 {
4712 struct cas *cp = netdev_priv(dev);
4713 return cp->msg_enable;
4714 }
4715
4716 static void cas_set_msglevel(struct net_device *dev, u32 value)
4717 {
4718 struct cas *cp = netdev_priv(dev);
4719 cp->msg_enable = value;
4720 }
4721
4722 static int cas_get_regs_len(struct net_device *dev)
4723 {
4724 struct cas *cp = netdev_priv(dev);
4725 return cp->casreg_len < CAS_MAX_REGS ? cp->casreg_len: CAS_MAX_REGS;
4726 }
4727
4728 static void cas_get_regs(struct net_device *dev, struct ethtool_regs *regs,
4729 void *p)
4730 {
4731 struct cas *cp = netdev_priv(dev);
4732 regs->version = 0;
4733 /* cas_read_regs handles locks (cp->lock). */
4734 cas_read_regs(cp, p, regs->len / sizeof(u32));
4735 }
4736
4737 static int cas_get_sset_count(struct net_device *dev, int sset)
4738 {
4739 switch (sset) {
4740 case ETH_SS_STATS:
4741 return CAS_NUM_STAT_KEYS;
4742 default:
4743 return -EOPNOTSUPP;
4744 }
4745 }
4746
4747 static void cas_get_strings(struct net_device *dev, u32 stringset, u8 *data)
4748 {
4749 memcpy(data, &ethtool_cassini_statnames,
4750 CAS_NUM_STAT_KEYS * ETH_GSTRING_LEN);
4751 }
4752
4753 static void cas_get_ethtool_stats(struct net_device *dev,
4754 struct ethtool_stats *estats, u64 *data)
4755 {
4756 struct cas *cp = netdev_priv(dev);
4757 struct net_device_stats *stats = cas_get_stats(cp->dev);
4758 int i = 0;
4759 data[i++] = stats->collisions;
4760 data[i++] = stats->rx_bytes;
4761 data[i++] = stats->rx_crc_errors;
4762 data[i++] = stats->rx_dropped;
4763 data[i++] = stats->rx_errors;
4764 data[i++] = stats->rx_fifo_errors;
4765 data[i++] = stats->rx_frame_errors;
4766 data[i++] = stats->rx_length_errors;
4767 data[i++] = stats->rx_over_errors;
4768 data[i++] = stats->rx_packets;
4769 data[i++] = stats->tx_aborted_errors;
4770 data[i++] = stats->tx_bytes;
4771 data[i++] = stats->tx_dropped;
4772 data[i++] = stats->tx_errors;
4773 data[i++] = stats->tx_fifo_errors;
4774 data[i++] = stats->tx_packets;
4775 BUG_ON(i != CAS_NUM_STAT_KEYS);
4776 }
4777
4778 static const struct ethtool_ops cas_ethtool_ops = {
4779 .get_drvinfo = cas_get_drvinfo,
4780 .get_settings = cas_get_settings,
4781 .set_settings = cas_set_settings,
4782 .nway_reset = cas_nway_reset,
4783 .get_link = cas_get_link,
4784 .get_msglevel = cas_get_msglevel,
4785 .set_msglevel = cas_set_msglevel,
4786 .get_regs_len = cas_get_regs_len,
4787 .get_regs = cas_get_regs,
4788 .get_sset_count = cas_get_sset_count,
4789 .get_strings = cas_get_strings,
4790 .get_ethtool_stats = cas_get_ethtool_stats,
4791 };
4792
4793 static int cas_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
4794 {
4795 struct cas *cp = netdev_priv(dev);
4796 struct mii_ioctl_data *data = if_mii(ifr);
4797 unsigned long flags;
4798 int rc = -EOPNOTSUPP;
4799
4800 /* Hold the PM mutex while doing ioctl's or we may collide
4801 * with open/close and power management and oops.
4802 */
4803 mutex_lock(&cp->pm_mutex);
4804 switch (cmd) {
4805 case SIOCGMIIPHY: /* Get address of MII PHY in use. */
4806 data->phy_id = cp->phy_addr;
4807 /* Fallthrough... */
4808
4809 case SIOCGMIIREG: /* Read MII PHY register. */
4810 spin_lock_irqsave(&cp->lock, flags);
4811 cas_mif_poll(cp, 0);
4812 data->val_out = cas_phy_read(cp, data->reg_num & 0x1f);
4813 cas_mif_poll(cp, 1);
4814 spin_unlock_irqrestore(&cp->lock, flags);
4815 rc = 0;
4816 break;
4817
4818 case SIOCSMIIREG: /* Write MII PHY register. */
4819 spin_lock_irqsave(&cp->lock, flags);
4820 cas_mif_poll(cp, 0);
4821 rc = cas_phy_write(cp, data->reg_num & 0x1f, data->val_in);
4822 cas_mif_poll(cp, 1);
4823 spin_unlock_irqrestore(&cp->lock, flags);
4824 break;
4825 default:
4826 break;
4827 }
4828
4829 mutex_unlock(&cp->pm_mutex);
4830 return rc;
4831 }
4832
4833 /* When this chip sits underneath an Intel 31154 bridge, it is the
4834 * only subordinate device and we can tweak the bridge settings to
4835 * reflect that fact.
4836 */
4837 static void __devinit cas_program_bridge(struct pci_dev *cas_pdev)
4838 {
4839 struct pci_dev *pdev = cas_pdev->bus->self;
4840 u32 val;
4841
4842 if (!pdev)
4843 return;
4844
4845 if (pdev->vendor != 0x8086 || pdev->device != 0x537c)
4846 return;
4847
4848 /* Clear bit 10 (Bus Parking Control) in the Secondary
4849 * Arbiter Control/Status Register which lives at offset
4850 * 0x41. Using a 32-bit word read/modify/write at 0x40
4851 * is much simpler so that's how we do this.
4852 */
4853 pci_read_config_dword(pdev, 0x40, &val);
4854 val &= ~0x00040000;
4855 pci_write_config_dword(pdev, 0x40, val);
4856
4857 /* Max out the Multi-Transaction Timer settings since
4858 * Cassini is the only device present.
4859 *
4860 * The register is 16-bit and lives at 0x50. When the
4861 * settings are enabled, it extends the GRANT# signal
4862 * for a requestor after a transaction is complete. This
4863 * allows the next request to run without first needing
4864 * to negotiate the GRANT# signal back.
4865 *
4866 * Bits 12:10 define the grant duration:
4867 *
4868 * 1 -- 16 clocks
4869 * 2 -- 32 clocks
4870 * 3 -- 64 clocks
4871 * 4 -- 128 clocks
4872 * 5 -- 256 clocks
4873 *
4874 * All other values are illegal.
4875 *
4876 * Bits 09:00 define which REQ/GNT signal pairs get the
4877 * GRANT# signal treatment. We set them all.
4878 */
4879 pci_write_config_word(pdev, 0x50, (5 << 10) | 0x3ff);
4880
4881 /* The Read Prefecth Policy register is 16-bit and sits at
4882 * offset 0x52. It enables a "smart" pre-fetch policy. We
4883 * enable it and max out all of the settings since only one
4884 * device is sitting underneath and thus bandwidth sharing is
4885 * not an issue.
4886 *
4887 * The register has several 3 bit fields, which indicates a
4888 * multiplier applied to the base amount of prefetching the
4889 * chip would do. These fields are at:
4890 *
4891 * 15:13 --- ReRead Primary Bus
4892 * 12:10 --- FirstRead Primary Bus
4893 * 09:07 --- ReRead Secondary Bus
4894 * 06:04 --- FirstRead Secondary Bus
4895 *
4896 * Bits 03:00 control which REQ/GNT pairs the prefetch settings
4897 * get enabled on. Bit 3 is a grouped enabler which controls
4898 * all of the REQ/GNT pairs from [8:3]. Bits 2 to 0 control
4899 * the individual REQ/GNT pairs [2:0].
4900 */
4901 pci_write_config_word(pdev, 0x52,
4902 (0x7 << 13) |
4903 (0x7 << 10) |
4904 (0x7 << 7) |
4905 (0x7 << 4) |
4906 (0xf << 0));
4907
4908 /* Force cacheline size to 0x8 */
4909 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, 0x08);
4910
4911 /* Force latency timer to maximum setting so Cassini can
4912 * sit on the bus as long as it likes.
4913 */
4914 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0xff);
4915 }
4916
4917 static const struct net_device_ops cas_netdev_ops = {
4918 .ndo_open = cas_open,
4919 .ndo_stop = cas_close,
4920 .ndo_start_xmit = cas_start_xmit,
4921 .ndo_get_stats = cas_get_stats,
4922 .ndo_set_multicast_list = cas_set_multicast,
4923 .ndo_do_ioctl = cas_ioctl,
4924 .ndo_tx_timeout = cas_tx_timeout,
4925 .ndo_change_mtu = cas_change_mtu,
4926 .ndo_set_mac_address = eth_mac_addr,
4927 .ndo_validate_addr = eth_validate_addr,
4928 #ifdef CONFIG_NET_POLL_CONTROLLER
4929 .ndo_poll_controller = cas_netpoll,
4930 #endif
4931 };
4932
4933 static int __devinit cas_init_one(struct pci_dev *pdev,
4934 const struct pci_device_id *ent)
4935 {
4936 static int cas_version_printed = 0;
4937 unsigned long casreg_len;
4938 struct net_device *dev;
4939 struct cas *cp;
4940 int i, err, pci_using_dac;
4941 u16 pci_cmd;
4942 u8 orig_cacheline_size = 0, cas_cacheline_size = 0;
4943
4944 if (cas_version_printed++ == 0)
4945 pr_info("%s", version);
4946
4947 err = pci_enable_device(pdev);
4948 if (err) {
4949 dev_err(&pdev->dev, "Cannot enable PCI device, aborting\n");
4950 return err;
4951 }
4952
4953 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
4954 dev_err(&pdev->dev, "Cannot find proper PCI device "
4955 "base address, aborting\n");
4956 err = -ENODEV;
4957 goto err_out_disable_pdev;
4958 }
4959
4960 dev = alloc_etherdev(sizeof(*cp));
4961 if (!dev) {
4962 dev_err(&pdev->dev, "Etherdev alloc failed, aborting\n");
4963 err = -ENOMEM;
4964 goto err_out_disable_pdev;
4965 }
4966 SET_NETDEV_DEV(dev, &pdev->dev);
4967
4968 err = pci_request_regions(pdev, dev->name);
4969 if (err) {
4970 dev_err(&pdev->dev, "Cannot obtain PCI resources, aborting\n");
4971 goto err_out_free_netdev;
4972 }
4973 pci_set_master(pdev);
4974
4975 /* we must always turn on parity response or else parity
4976 * doesn't get generated properly. disable SERR/PERR as well.
4977 * in addition, we want to turn MWI on.
4978 */
4979 pci_read_config_word(pdev, PCI_COMMAND, &pci_cmd);
4980 pci_cmd &= ~PCI_COMMAND_SERR;
4981 pci_cmd |= PCI_COMMAND_PARITY;
4982 pci_write_config_word(pdev, PCI_COMMAND, pci_cmd);
4983 if (pci_try_set_mwi(pdev))
4984 pr_warning("Could not enable MWI for %s\n", pci_name(pdev));
4985
4986 cas_program_bridge(pdev);
4987
4988 /*
4989 * On some architectures, the default cache line size set
4990 * by pci_try_set_mwi reduces perforamnce. We have to increase
4991 * it for this case. To start, we'll print some configuration
4992 * data.
4993 */
4994 #if 1
4995 pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE,
4996 &orig_cacheline_size);
4997 if (orig_cacheline_size < CAS_PREF_CACHELINE_SIZE) {
4998 cas_cacheline_size =
4999 (CAS_PREF_CACHELINE_SIZE < SMP_CACHE_BYTES) ?
5000 CAS_PREF_CACHELINE_SIZE : SMP_CACHE_BYTES;
5001 if (pci_write_config_byte(pdev,
5002 PCI_CACHE_LINE_SIZE,
5003 cas_cacheline_size)) {
5004 dev_err(&pdev->dev, "Could not set PCI cache "
5005 "line size\n");
5006 goto err_write_cacheline;
5007 }
5008 }
5009 #endif
5010
5011
5012 /* Configure DMA attributes. */
5013 if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
5014 pci_using_dac = 1;
5015 err = pci_set_consistent_dma_mask(pdev,
5016 DMA_BIT_MASK(64));
5017 if (err < 0) {
5018 dev_err(&pdev->dev, "Unable to obtain 64-bit DMA "
5019 "for consistent allocations\n");
5020 goto err_out_free_res;
5021 }
5022
5023 } else {
5024 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5025 if (err) {
5026 dev_err(&pdev->dev, "No usable DMA configuration, "
5027 "aborting\n");
5028 goto err_out_free_res;
5029 }
5030 pci_using_dac = 0;
5031 }
5032
5033 casreg_len = pci_resource_len(pdev, 0);
5034
5035 cp = netdev_priv(dev);
5036 cp->pdev = pdev;
5037 #if 1
5038 /* A value of 0 indicates we never explicitly set it */
5039 cp->orig_cacheline_size = cas_cacheline_size ? orig_cacheline_size: 0;
5040 #endif
5041 cp->dev = dev;
5042 cp->msg_enable = (cassini_debug < 0) ? CAS_DEF_MSG_ENABLE :
5043 cassini_debug;
5044
5045 cp->link_transition = LINK_TRANSITION_UNKNOWN;
5046 cp->link_transition_jiffies_valid = 0;
5047
5048 spin_lock_init(&cp->lock);
5049 spin_lock_init(&cp->rx_inuse_lock);
5050 spin_lock_init(&cp->rx_spare_lock);
5051 for (i = 0; i < N_TX_RINGS; i++) {
5052 spin_lock_init(&cp->stat_lock[i]);
5053 spin_lock_init(&cp->tx_lock[i]);
5054 }
5055 spin_lock_init(&cp->stat_lock[N_TX_RINGS]);
5056 mutex_init(&cp->pm_mutex);
5057
5058 init_timer(&cp->link_timer);
5059 cp->link_timer.function = cas_link_timer;
5060 cp->link_timer.data = (unsigned long) cp;
5061
5062 #if 1
5063 /* Just in case the implementation of atomic operations
5064 * change so that an explicit initialization is necessary.
5065 */
5066 atomic_set(&cp->reset_task_pending, 0);
5067 atomic_set(&cp->reset_task_pending_all, 0);
5068 atomic_set(&cp->reset_task_pending_spare, 0);
5069 atomic_set(&cp->reset_task_pending_mtu, 0);
5070 #endif
5071 INIT_WORK(&cp->reset_task, cas_reset_task);
5072
5073 /* Default link parameters */
5074 if (link_mode >= 0 && link_mode < 6)
5075 cp->link_cntl = link_modes[link_mode];
5076 else
5077 cp->link_cntl = BMCR_ANENABLE;
5078 cp->lstate = link_down;
5079 cp->link_transition = LINK_TRANSITION_LINK_DOWN;
5080 netif_carrier_off(cp->dev);
5081 cp->timer_ticks = 0;
5082
5083 /* give us access to cassini registers */
5084 cp->regs = pci_iomap(pdev, 0, casreg_len);
5085 if (!cp->regs) {
5086 dev_err(&pdev->dev, "Cannot map device registers, aborting\n");
5087 goto err_out_free_res;
5088 }
5089 cp->casreg_len = casreg_len;
5090
5091 pci_save_state(pdev);
5092 cas_check_pci_invariants(cp);
5093 cas_hard_reset(cp);
5094 cas_reset(cp, 0);
5095 if (cas_check_invariants(cp))
5096 goto err_out_iounmap;
5097 if (cp->cas_flags & CAS_FLAG_SATURN)
5098 if (cas_saturn_firmware_init(cp))
5099 goto err_out_iounmap;
5100
5101 cp->init_block = (struct cas_init_block *)
5102 pci_alloc_consistent(pdev, sizeof(struct cas_init_block),
5103 &cp->block_dvma);
5104 if (!cp->init_block) {
5105 dev_err(&pdev->dev, "Cannot allocate init block, aborting\n");
5106 goto err_out_iounmap;
5107 }
5108
5109 for (i = 0; i < N_TX_RINGS; i++)
5110 cp->init_txds[i] = cp->init_block->txds[i];
5111
5112 for (i = 0; i < N_RX_DESC_RINGS; i++)
5113 cp->init_rxds[i] = cp->init_block->rxds[i];
5114
5115 for (i = 0; i < N_RX_COMP_RINGS; i++)
5116 cp->init_rxcs[i] = cp->init_block->rxcs[i];
5117
5118 for (i = 0; i < N_RX_FLOWS; i++)
5119 skb_queue_head_init(&cp->rx_flows[i]);
5120
5121 dev->netdev_ops = &cas_netdev_ops;
5122 dev->ethtool_ops = &cas_ethtool_ops;
5123 dev->watchdog_timeo = CAS_TX_TIMEOUT;
5124
5125 #ifdef USE_NAPI
5126 netif_napi_add(dev, &cp->napi, cas_poll, 64);
5127 #endif
5128 dev->irq = pdev->irq;
5129 dev->dma = 0;
5130
5131 /* Cassini features. */
5132 if ((cp->cas_flags & CAS_FLAG_NO_HW_CSUM) == 0)
5133 dev->features |= NETIF_F_HW_CSUM | NETIF_F_SG;
5134
5135 if (pci_using_dac)
5136 dev->features |= NETIF_F_HIGHDMA;
5137
5138 if (register_netdev(dev)) {
5139 dev_err(&pdev->dev, "Cannot register net device, aborting\n");
5140 goto err_out_free_consistent;
5141 }
5142
5143 i = readl(cp->regs + REG_BIM_CFG);
5144 netdev_info(dev, "Sun Cassini%s (%sbit/%sMHz PCI/%s) Ethernet[%d] %pM\n",
5145 (cp->cas_flags & CAS_FLAG_REG_PLUS) ? "+" : "",
5146 (i & BIM_CFG_32BIT) ? "32" : "64",
5147 (i & BIM_CFG_66MHZ) ? "66" : "33",
5148 (cp->phy_type == CAS_PHY_SERDES) ? "Fi" : "Cu", pdev->irq,
5149 dev->dev_addr);
5150
5151 pci_set_drvdata(pdev, dev);
5152 cp->hw_running = 1;
5153 cas_entropy_reset(cp);
5154 cas_phy_init(cp);
5155 cas_begin_auto_negotiation(cp, NULL);
5156 return 0;
5157
5158 err_out_free_consistent:
5159 pci_free_consistent(pdev, sizeof(struct cas_init_block),
5160 cp->init_block, cp->block_dvma);
5161
5162 err_out_iounmap:
5163 mutex_lock(&cp->pm_mutex);
5164 if (cp->hw_running)
5165 cas_shutdown(cp);
5166 mutex_unlock(&cp->pm_mutex);
5167
5168 pci_iounmap(pdev, cp->regs);
5169
5170
5171 err_out_free_res:
5172 pci_release_regions(pdev);
5173
5174 err_write_cacheline:
5175 /* Try to restore it in case the error occured after we
5176 * set it.
5177 */
5178 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE, orig_cacheline_size);
5179
5180 err_out_free_netdev:
5181 free_netdev(dev);
5182
5183 err_out_disable_pdev:
5184 pci_disable_device(pdev);
5185 pci_set_drvdata(pdev, NULL);
5186 return -ENODEV;
5187 }
5188
5189 static void __devexit cas_remove_one(struct pci_dev *pdev)
5190 {
5191 struct net_device *dev = pci_get_drvdata(pdev);
5192 struct cas *cp;
5193 if (!dev)
5194 return;
5195
5196 cp = netdev_priv(dev);
5197 unregister_netdev(dev);
5198
5199 if (cp->fw_data)
5200 vfree(cp->fw_data);
5201
5202 mutex_lock(&cp->pm_mutex);
5203 flush_scheduled_work();
5204 if (cp->hw_running)
5205 cas_shutdown(cp);
5206 mutex_unlock(&cp->pm_mutex);
5207
5208 #if 1
5209 if (cp->orig_cacheline_size) {
5210 /* Restore the cache line size if we had modified
5211 * it.
5212 */
5213 pci_write_config_byte(pdev, PCI_CACHE_LINE_SIZE,
5214 cp->orig_cacheline_size);
5215 }
5216 #endif
5217 pci_free_consistent(pdev, sizeof(struct cas_init_block),
5218 cp->init_block, cp->block_dvma);
5219 pci_iounmap(pdev, cp->regs);
5220 free_netdev(dev);
5221 pci_release_regions(pdev);
5222 pci_disable_device(pdev);
5223 pci_set_drvdata(pdev, NULL);
5224 }
5225
5226 #ifdef CONFIG_PM
5227 static int cas_suspend(struct pci_dev *pdev, pm_message_t state)
5228 {
5229 struct net_device *dev = pci_get_drvdata(pdev);
5230 struct cas *cp = netdev_priv(dev);
5231 unsigned long flags;
5232
5233 mutex_lock(&cp->pm_mutex);
5234
5235 /* If the driver is opened, we stop the DMA */
5236 if (cp->opened) {
5237 netif_device_detach(dev);
5238
5239 cas_lock_all_save(cp, flags);
5240
5241 /* We can set the second arg of cas_reset to 0
5242 * because on resume, we'll call cas_init_hw with
5243 * its second arg set so that autonegotiation is
5244 * restarted.
5245 */
5246 cas_reset(cp, 0);
5247 cas_clean_rings(cp);
5248 cas_unlock_all_restore(cp, flags);
5249 }
5250
5251 if (cp->hw_running)
5252 cas_shutdown(cp);
5253 mutex_unlock(&cp->pm_mutex);
5254
5255 return 0;
5256 }
5257
5258 static int cas_resume(struct pci_dev *pdev)
5259 {
5260 struct net_device *dev = pci_get_drvdata(pdev);
5261 struct cas *cp = netdev_priv(dev);
5262
5263 netdev_info(dev, "resuming\n");
5264
5265 mutex_lock(&cp->pm_mutex);
5266 cas_hard_reset(cp);
5267 if (cp->opened) {
5268 unsigned long flags;
5269 cas_lock_all_save(cp, flags);
5270 cas_reset(cp, 0);
5271 cp->hw_running = 1;
5272 cas_clean_rings(cp);
5273 cas_init_hw(cp, 1);
5274 cas_unlock_all_restore(cp, flags);
5275
5276 netif_device_attach(dev);
5277 }
5278 mutex_unlock(&cp->pm_mutex);
5279 return 0;
5280 }
5281 #endif /* CONFIG_PM */
5282
5283 static struct pci_driver cas_driver = {
5284 .name = DRV_MODULE_NAME,
5285 .id_table = cas_pci_tbl,
5286 .probe = cas_init_one,
5287 .remove = __devexit_p(cas_remove_one),
5288 #ifdef CONFIG_PM
5289 .suspend = cas_suspend,
5290 .resume = cas_resume
5291 #endif
5292 };
5293
5294 static int __init cas_init(void)
5295 {
5296 if (linkdown_timeout > 0)
5297 link_transition_timeout = linkdown_timeout * HZ;
5298 else
5299 link_transition_timeout = 0;
5300
5301 return pci_register_driver(&cas_driver);
5302 }
5303
5304 static void __exit cas_cleanup(void)
5305 {
5306 pci_unregister_driver(&cas_driver);
5307 }
5308
5309 module_init(cas_init);
5310 module_exit(cas_cleanup);
Linux with added FPC-III support