forked from grate-driver/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
fore200e.c
3018 lines (2296 loc) · 82.8 KB
/
fore200e.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0-or-later
/*
A FORE Systems 200E-series driver for ATM on Linux.
Christophe Lizzi (lizzi@cnam.fr), October 1999-March 2003.
Based on the PCA-200E driver from Uwe Dannowski (Uwe.Dannowski@inf.tu-dresden.de).
This driver simultaneously supports PCA-200E and SBA-200E adapters
on i386, alpha (untested), powerpc, sparc and sparc64 architectures.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/pgtable.h>
#include <asm/io.h>
#include <asm/string.h>
#include <asm/page.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
#ifdef CONFIG_SBUS
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/idprom.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#endif
#if defined(CONFIG_ATM_FORE200E_USE_TASKLET) /* defer interrupt work to a tasklet */
#define FORE200E_USE_TASKLET
#endif
#if 0 /* enable the debugging code of the buffer supply queues */
#define FORE200E_BSQ_DEBUG
#endif
#if 1 /* ensure correct handling of 52-byte AAL0 SDUs expected by atmdump-like apps */
#define FORE200E_52BYTE_AAL0_SDU
#endif
#include "fore200e.h"
#include "suni.h"
#define FORE200E_VERSION "0.3e"
#define FORE200E "fore200e: "
#if 0 /* override .config */
#define CONFIG_ATM_FORE200E_DEBUG 1
#endif
#if defined(CONFIG_ATM_FORE200E_DEBUG) && (CONFIG_ATM_FORE200E_DEBUG > 0)
#define DPRINTK(level, format, args...) do { if (CONFIG_ATM_FORE200E_DEBUG >= (level)) \
printk(FORE200E format, ##args); } while (0)
#else
#define DPRINTK(level, format, args...) do {} while (0)
#endif
#define FORE200E_ALIGN(addr, alignment) \
((((unsigned long)(addr) + (alignment - 1)) & ~(alignment - 1)) - (unsigned long)(addr))
#define FORE200E_DMA_INDEX(dma_addr, type, index) ((dma_addr) + (index) * sizeof(type))
#define FORE200E_INDEX(virt_addr, type, index) (&((type *)(virt_addr))[ index ])
#define FORE200E_NEXT_ENTRY(index, modulo) (index = ((index) + 1) % (modulo))
#if 1
#define ASSERT(expr) if (!(expr)) { \
printk(FORE200E "assertion failed! %s[%d]: %s\n", \
__func__, __LINE__, #expr); \
panic(FORE200E "%s", __func__); \
}
#else
#define ASSERT(expr) do {} while (0)
#endif
static const struct atmdev_ops fore200e_ops;
static LIST_HEAD(fore200e_boards);
MODULE_AUTHOR("Christophe Lizzi - credits to Uwe Dannowski and Heikki Vatiainen");
MODULE_DESCRIPTION("FORE Systems 200E-series ATM driver - version " FORE200E_VERSION);
static const int fore200e_rx_buf_nbr[ BUFFER_SCHEME_NBR ][ BUFFER_MAGN_NBR ] = {
{ BUFFER_S1_NBR, BUFFER_L1_NBR },
{ BUFFER_S2_NBR, BUFFER_L2_NBR }
};
static const int fore200e_rx_buf_size[ BUFFER_SCHEME_NBR ][ BUFFER_MAGN_NBR ] = {
{ BUFFER_S1_SIZE, BUFFER_L1_SIZE },
{ BUFFER_S2_SIZE, BUFFER_L2_SIZE }
};
#if defined(CONFIG_ATM_FORE200E_DEBUG) && (CONFIG_ATM_FORE200E_DEBUG > 0)
static const char* fore200e_traffic_class[] = { "NONE", "UBR", "CBR", "VBR", "ABR", "ANY" };
#endif
#if 0 /* currently unused */
static int
fore200e_fore2atm_aal(enum fore200e_aal aal)
{
switch(aal) {
case FORE200E_AAL0: return ATM_AAL0;
case FORE200E_AAL34: return ATM_AAL34;
case FORE200E_AAL5: return ATM_AAL5;
}
return -EINVAL;
}
#endif
static enum fore200e_aal
fore200e_atm2fore_aal(int aal)
{
switch(aal) {
case ATM_AAL0: return FORE200E_AAL0;
case ATM_AAL34: return FORE200E_AAL34;
case ATM_AAL1:
case ATM_AAL2:
case ATM_AAL5: return FORE200E_AAL5;
}
return -EINVAL;
}
static char*
fore200e_irq_itoa(int irq)
{
static char str[8];
sprintf(str, "%d", irq);
return str;
}
/* allocate and align a chunk of memory intended to hold the data behing exchanged
between the driver and the adapter (using streaming DVMA) */
static int
fore200e_chunk_alloc(struct fore200e* fore200e, struct chunk* chunk, int size, int alignment, int direction)
{
unsigned long offset = 0;
if (alignment <= sizeof(int))
alignment = 0;
chunk->alloc_size = size + alignment;
chunk->direction = direction;
chunk->alloc_addr = kzalloc(chunk->alloc_size, GFP_KERNEL);
if (chunk->alloc_addr == NULL)
return -ENOMEM;
if (alignment > 0)
offset = FORE200E_ALIGN(chunk->alloc_addr, alignment);
chunk->align_addr = chunk->alloc_addr + offset;
chunk->dma_addr = dma_map_single(fore200e->dev, chunk->align_addr,
size, direction);
if (dma_mapping_error(fore200e->dev, chunk->dma_addr)) {
kfree(chunk->alloc_addr);
return -ENOMEM;
}
return 0;
}
/* free a chunk of memory */
static void
fore200e_chunk_free(struct fore200e* fore200e, struct chunk* chunk)
{
dma_unmap_single(fore200e->dev, chunk->dma_addr, chunk->dma_size,
chunk->direction);
kfree(chunk->alloc_addr);
}
/*
* Allocate a DMA consistent chunk of memory intended to act as a communication
* mechanism (to hold descriptors, status, queues, etc.) shared by the driver
* and the adapter.
*/
static int
fore200e_dma_chunk_alloc(struct fore200e *fore200e, struct chunk *chunk,
int size, int nbr, int alignment)
{
/* returned chunks are page-aligned */
chunk->alloc_size = size * nbr;
chunk->alloc_addr = dma_alloc_coherent(fore200e->dev, chunk->alloc_size,
&chunk->dma_addr, GFP_KERNEL);
if (!chunk->alloc_addr)
return -ENOMEM;
chunk->align_addr = chunk->alloc_addr;
return 0;
}
/*
* Free a DMA consistent chunk of memory.
*/
static void
fore200e_dma_chunk_free(struct fore200e* fore200e, struct chunk* chunk)
{
dma_free_coherent(fore200e->dev, chunk->alloc_size, chunk->alloc_addr,
chunk->dma_addr);
}
static void
fore200e_spin(int msecs)
{
unsigned long timeout = jiffies + msecs_to_jiffies(msecs);
while (time_before(jiffies, timeout));
}
static int
fore200e_poll(struct fore200e* fore200e, volatile u32* addr, u32 val, int msecs)
{
unsigned long timeout = jiffies + msecs_to_jiffies(msecs);
int ok;
mb();
do {
if ((ok = (*addr == val)) || (*addr & STATUS_ERROR))
break;
} while (time_before(jiffies, timeout));
#if 1
if (!ok) {
printk(FORE200E "cmd polling failed, got status 0x%08x, expected 0x%08x\n",
*addr, val);
}
#endif
return ok;
}
static int
fore200e_io_poll(struct fore200e* fore200e, volatile u32 __iomem *addr, u32 val, int msecs)
{
unsigned long timeout = jiffies + msecs_to_jiffies(msecs);
int ok;
do {
if ((ok = (fore200e->bus->read(addr) == val)))
break;
} while (time_before(jiffies, timeout));
#if 1
if (!ok) {
printk(FORE200E "I/O polling failed, got status 0x%08x, expected 0x%08x\n",
fore200e->bus->read(addr), val);
}
#endif
return ok;
}
static void
fore200e_free_rx_buf(struct fore200e* fore200e)
{
int scheme, magn, nbr;
struct buffer* buffer;
for (scheme = 0; scheme < BUFFER_SCHEME_NBR; scheme++) {
for (magn = 0; magn < BUFFER_MAGN_NBR; magn++) {
if ((buffer = fore200e->host_bsq[ scheme ][ magn ].buffer) != NULL) {
for (nbr = 0; nbr < fore200e_rx_buf_nbr[ scheme ][ magn ]; nbr++) {
struct chunk* data = &buffer[ nbr ].data;
if (data->alloc_addr != NULL)
fore200e_chunk_free(fore200e, data);
}
}
}
}
}
static void
fore200e_uninit_bs_queue(struct fore200e* fore200e)
{
int scheme, magn;
for (scheme = 0; scheme < BUFFER_SCHEME_NBR; scheme++) {
for (magn = 0; magn < BUFFER_MAGN_NBR; magn++) {
struct chunk* status = &fore200e->host_bsq[ scheme ][ magn ].status;
struct chunk* rbd_block = &fore200e->host_bsq[ scheme ][ magn ].rbd_block;
if (status->alloc_addr)
fore200e_dma_chunk_free(fore200e, status);
if (rbd_block->alloc_addr)
fore200e_dma_chunk_free(fore200e, rbd_block);
}
}
}
static int
fore200e_reset(struct fore200e* fore200e, int diag)
{
int ok;
fore200e->cp_monitor = fore200e->virt_base + FORE200E_CP_MONITOR_OFFSET;
fore200e->bus->write(BSTAT_COLD_START, &fore200e->cp_monitor->bstat);
fore200e->bus->reset(fore200e);
if (diag) {
ok = fore200e_io_poll(fore200e, &fore200e->cp_monitor->bstat, BSTAT_SELFTEST_OK, 1000);
if (ok == 0) {
printk(FORE200E "device %s self-test failed\n", fore200e->name);
return -ENODEV;
}
printk(FORE200E "device %s self-test passed\n", fore200e->name);
fore200e->state = FORE200E_STATE_RESET;
}
return 0;
}
static void
fore200e_shutdown(struct fore200e* fore200e)
{
printk(FORE200E "removing device %s at 0x%lx, IRQ %s\n",
fore200e->name, fore200e->phys_base,
fore200e_irq_itoa(fore200e->irq));
if (fore200e->state > FORE200E_STATE_RESET) {
/* first, reset the board to prevent further interrupts or data transfers */
fore200e_reset(fore200e, 0);
}
/* then, release all allocated resources */
switch(fore200e->state) {
case FORE200E_STATE_COMPLETE:
kfree(fore200e->stats);
fallthrough;
case FORE200E_STATE_IRQ:
free_irq(fore200e->irq, fore200e->atm_dev);
fallthrough;
case FORE200E_STATE_ALLOC_BUF:
fore200e_free_rx_buf(fore200e);
fallthrough;
case FORE200E_STATE_INIT_BSQ:
fore200e_uninit_bs_queue(fore200e);
fallthrough;
case FORE200E_STATE_INIT_RXQ:
fore200e_dma_chunk_free(fore200e, &fore200e->host_rxq.status);
fore200e_dma_chunk_free(fore200e, &fore200e->host_rxq.rpd);
fallthrough;
case FORE200E_STATE_INIT_TXQ:
fore200e_dma_chunk_free(fore200e, &fore200e->host_txq.status);
fore200e_dma_chunk_free(fore200e, &fore200e->host_txq.tpd);
fallthrough;
case FORE200E_STATE_INIT_CMDQ:
fore200e_dma_chunk_free(fore200e, &fore200e->host_cmdq.status);
fallthrough;
case FORE200E_STATE_INITIALIZE:
/* nothing to do for that state */
case FORE200E_STATE_START_FW:
/* nothing to do for that state */
case FORE200E_STATE_RESET:
/* nothing to do for that state */
case FORE200E_STATE_MAP:
fore200e->bus->unmap(fore200e);
fallthrough;
case FORE200E_STATE_CONFIGURE:
/* nothing to do for that state */
case FORE200E_STATE_REGISTER:
/* XXX shouldn't we *start* by deregistering the device? */
atm_dev_deregister(fore200e->atm_dev);
fallthrough;
case FORE200E_STATE_BLANK:
/* nothing to do for that state */
break;
}
}
#ifdef CONFIG_PCI
static u32 fore200e_pca_read(volatile u32 __iomem *addr)
{
/* on big-endian hosts, the board is configured to convert
the endianess of slave RAM accesses */
return le32_to_cpu(readl(addr));
}
static void fore200e_pca_write(u32 val, volatile u32 __iomem *addr)
{
/* on big-endian hosts, the board is configured to convert
the endianess of slave RAM accesses */
writel(cpu_to_le32(val), addr);
}
static int
fore200e_pca_irq_check(struct fore200e* fore200e)
{
/* this is a 1 bit register */
int irq_posted = readl(fore200e->regs.pca.psr);
#if defined(CONFIG_ATM_FORE200E_DEBUG) && (CONFIG_ATM_FORE200E_DEBUG == 2)
if (irq_posted && (readl(fore200e->regs.pca.hcr) & PCA200E_HCR_OUTFULL)) {
DPRINTK(2,"FIFO OUT full, device %d\n", fore200e->atm_dev->number);
}
#endif
return irq_posted;
}
static void
fore200e_pca_irq_ack(struct fore200e* fore200e)
{
writel(PCA200E_HCR_CLRINTR, fore200e->regs.pca.hcr);
}
static void
fore200e_pca_reset(struct fore200e* fore200e)
{
writel(PCA200E_HCR_RESET, fore200e->regs.pca.hcr);
fore200e_spin(10);
writel(0, fore200e->regs.pca.hcr);
}
static int fore200e_pca_map(struct fore200e* fore200e)
{
DPRINTK(2, "device %s being mapped in memory\n", fore200e->name);
fore200e->virt_base = ioremap(fore200e->phys_base, PCA200E_IOSPACE_LENGTH);
if (fore200e->virt_base == NULL) {
printk(FORE200E "can't map device %s\n", fore200e->name);
return -EFAULT;
}
DPRINTK(1, "device %s mapped to 0x%p\n", fore200e->name, fore200e->virt_base);
/* gain access to the PCA specific registers */
fore200e->regs.pca.hcr = fore200e->virt_base + PCA200E_HCR_OFFSET;
fore200e->regs.pca.imr = fore200e->virt_base + PCA200E_IMR_OFFSET;
fore200e->regs.pca.psr = fore200e->virt_base + PCA200E_PSR_OFFSET;
fore200e->state = FORE200E_STATE_MAP;
return 0;
}
static void
fore200e_pca_unmap(struct fore200e* fore200e)
{
DPRINTK(2, "device %s being unmapped from memory\n", fore200e->name);
if (fore200e->virt_base != NULL)
iounmap(fore200e->virt_base);
}
static int fore200e_pca_configure(struct fore200e *fore200e)
{
struct pci_dev *pci_dev = to_pci_dev(fore200e->dev);
u8 master_ctrl, latency;
DPRINTK(2, "device %s being configured\n", fore200e->name);
if ((pci_dev->irq == 0) || (pci_dev->irq == 0xFF)) {
printk(FORE200E "incorrect IRQ setting - misconfigured PCI-PCI bridge?\n");
return -EIO;
}
pci_read_config_byte(pci_dev, PCA200E_PCI_MASTER_CTRL, &master_ctrl);
master_ctrl = master_ctrl
#if defined(__BIG_ENDIAN)
/* request the PCA board to convert the endianess of slave RAM accesses */
| PCA200E_CTRL_CONVERT_ENDIAN
#endif
#if 0
| PCA200E_CTRL_DIS_CACHE_RD
| PCA200E_CTRL_DIS_WRT_INVAL
| PCA200E_CTRL_ENA_CONT_REQ_MODE
| PCA200E_CTRL_2_CACHE_WRT_INVAL
#endif
| PCA200E_CTRL_LARGE_PCI_BURSTS;
pci_write_config_byte(pci_dev, PCA200E_PCI_MASTER_CTRL, master_ctrl);
/* raise latency from 32 (default) to 192, as this seems to prevent NIC
lockups (under heavy rx loads) due to continuous 'FIFO OUT full' condition.
this may impact the performances of other PCI devices on the same bus, though */
latency = 192;
pci_write_config_byte(pci_dev, PCI_LATENCY_TIMER, latency);
fore200e->state = FORE200E_STATE_CONFIGURE;
return 0;
}
static int __init
fore200e_pca_prom_read(struct fore200e* fore200e, struct prom_data* prom)
{
struct host_cmdq* cmdq = &fore200e->host_cmdq;
struct host_cmdq_entry* entry = &cmdq->host_entry[ cmdq->head ];
struct prom_opcode opcode;
int ok;
u32 prom_dma;
FORE200E_NEXT_ENTRY(cmdq->head, QUEUE_SIZE_CMD);
opcode.opcode = OPCODE_GET_PROM;
opcode.pad = 0;
prom_dma = dma_map_single(fore200e->dev, prom, sizeof(struct prom_data),
DMA_FROM_DEVICE);
if (dma_mapping_error(fore200e->dev, prom_dma))
return -ENOMEM;
fore200e->bus->write(prom_dma, &entry->cp_entry->cmd.prom_block.prom_haddr);
*entry->status = STATUS_PENDING;
fore200e->bus->write(*(u32*)&opcode, (u32 __iomem *)&entry->cp_entry->cmd.prom_block.opcode);
ok = fore200e_poll(fore200e, entry->status, STATUS_COMPLETE, 400);
*entry->status = STATUS_FREE;
dma_unmap_single(fore200e->dev, prom_dma, sizeof(struct prom_data), DMA_FROM_DEVICE);
if (ok == 0) {
printk(FORE200E "unable to get PROM data from device %s\n", fore200e->name);
return -EIO;
}
#if defined(__BIG_ENDIAN)
#define swap_here(addr) (*((u32*)(addr)) = swab32( *((u32*)(addr)) ))
/* MAC address is stored as little-endian */
swap_here(&prom->mac_addr[0]);
swap_here(&prom->mac_addr[4]);
#endif
return 0;
}
static int
fore200e_pca_proc_read(struct fore200e* fore200e, char *page)
{
struct pci_dev *pci_dev = to_pci_dev(fore200e->dev);
return sprintf(page, " PCI bus/slot/function:\t%d/%d/%d\n",
pci_dev->bus->number, PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn));
}
static const struct fore200e_bus fore200e_pci_ops = {
.model_name = "PCA-200E",
.proc_name = "pca200e",
.descr_alignment = 32,
.buffer_alignment = 4,
.status_alignment = 32,
.read = fore200e_pca_read,
.write = fore200e_pca_write,
.configure = fore200e_pca_configure,
.map = fore200e_pca_map,
.reset = fore200e_pca_reset,
.prom_read = fore200e_pca_prom_read,
.unmap = fore200e_pca_unmap,
.irq_check = fore200e_pca_irq_check,
.irq_ack = fore200e_pca_irq_ack,
.proc_read = fore200e_pca_proc_read,
};
#endif /* CONFIG_PCI */
#ifdef CONFIG_SBUS
static u32 fore200e_sba_read(volatile u32 __iomem *addr)
{
return sbus_readl(addr);
}
static void fore200e_sba_write(u32 val, volatile u32 __iomem *addr)
{
sbus_writel(val, addr);
}
static void fore200e_sba_irq_enable(struct fore200e *fore200e)
{
u32 hcr = fore200e->bus->read(fore200e->regs.sba.hcr) & SBA200E_HCR_STICKY;
fore200e->bus->write(hcr | SBA200E_HCR_INTR_ENA, fore200e->regs.sba.hcr);
}
static int fore200e_sba_irq_check(struct fore200e *fore200e)
{
return fore200e->bus->read(fore200e->regs.sba.hcr) & SBA200E_HCR_INTR_REQ;
}
static void fore200e_sba_irq_ack(struct fore200e *fore200e)
{
u32 hcr = fore200e->bus->read(fore200e->regs.sba.hcr) & SBA200E_HCR_STICKY;
fore200e->bus->write(hcr | SBA200E_HCR_INTR_CLR, fore200e->regs.sba.hcr);
}
static void fore200e_sba_reset(struct fore200e *fore200e)
{
fore200e->bus->write(SBA200E_HCR_RESET, fore200e->regs.sba.hcr);
fore200e_spin(10);
fore200e->bus->write(0, fore200e->regs.sba.hcr);
}
static int __init fore200e_sba_map(struct fore200e *fore200e)
{
struct platform_device *op = to_platform_device(fore200e->dev);
unsigned int bursts;
/* gain access to the SBA specific registers */
fore200e->regs.sba.hcr = of_ioremap(&op->resource[0], 0, SBA200E_HCR_LENGTH, "SBA HCR");
fore200e->regs.sba.bsr = of_ioremap(&op->resource[1], 0, SBA200E_BSR_LENGTH, "SBA BSR");
fore200e->regs.sba.isr = of_ioremap(&op->resource[2], 0, SBA200E_ISR_LENGTH, "SBA ISR");
fore200e->virt_base = of_ioremap(&op->resource[3], 0, SBA200E_RAM_LENGTH, "SBA RAM");
if (!fore200e->virt_base) {
printk(FORE200E "unable to map RAM of device %s\n", fore200e->name);
return -EFAULT;
}
DPRINTK(1, "device %s mapped to 0x%p\n", fore200e->name, fore200e->virt_base);
fore200e->bus->write(0x02, fore200e->regs.sba.isr); /* XXX hardwired interrupt level */
/* get the supported DVMA burst sizes */
bursts = of_getintprop_default(op->dev.of_node->parent, "burst-sizes", 0x00);
if (sbus_can_dma_64bit())
sbus_set_sbus64(&op->dev, bursts);
fore200e->state = FORE200E_STATE_MAP;
return 0;
}
static void fore200e_sba_unmap(struct fore200e *fore200e)
{
struct platform_device *op = to_platform_device(fore200e->dev);
of_iounmap(&op->resource[0], fore200e->regs.sba.hcr, SBA200E_HCR_LENGTH);
of_iounmap(&op->resource[1], fore200e->regs.sba.bsr, SBA200E_BSR_LENGTH);
of_iounmap(&op->resource[2], fore200e->regs.sba.isr, SBA200E_ISR_LENGTH);
of_iounmap(&op->resource[3], fore200e->virt_base, SBA200E_RAM_LENGTH);
}
static int __init fore200e_sba_configure(struct fore200e *fore200e)
{
fore200e->state = FORE200E_STATE_CONFIGURE;
return 0;
}
static int __init fore200e_sba_prom_read(struct fore200e *fore200e, struct prom_data *prom)
{
struct platform_device *op = to_platform_device(fore200e->dev);
const u8 *prop;
int len;
prop = of_get_property(op->dev.of_node, "madaddrlo2", &len);
if (!prop)
return -ENODEV;
memcpy(&prom->mac_addr[4], prop, 4);
prop = of_get_property(op->dev.of_node, "madaddrhi4", &len);
if (!prop)
return -ENODEV;
memcpy(&prom->mac_addr[2], prop, 4);
prom->serial_number = of_getintprop_default(op->dev.of_node,
"serialnumber", 0);
prom->hw_revision = of_getintprop_default(op->dev.of_node,
"promversion", 0);
return 0;
}
static int fore200e_sba_proc_read(struct fore200e *fore200e, char *page)
{
struct platform_device *op = to_platform_device(fore200e->dev);
const struct linux_prom_registers *regs;
regs = of_get_property(op->dev.of_node, "reg", NULL);
return sprintf(page, " SBUS slot/device:\t\t%d/'%pOFn'\n",
(regs ? regs->which_io : 0), op->dev.of_node);
}
static const struct fore200e_bus fore200e_sbus_ops = {
.model_name = "SBA-200E",
.proc_name = "sba200e",
.descr_alignment = 32,
.buffer_alignment = 64,
.status_alignment = 32,
.read = fore200e_sba_read,
.write = fore200e_sba_write,
.configure = fore200e_sba_configure,
.map = fore200e_sba_map,
.reset = fore200e_sba_reset,
.prom_read = fore200e_sba_prom_read,
.unmap = fore200e_sba_unmap,
.irq_enable = fore200e_sba_irq_enable,
.irq_check = fore200e_sba_irq_check,
.irq_ack = fore200e_sba_irq_ack,
.proc_read = fore200e_sba_proc_read,
};
#endif /* CONFIG_SBUS */
static void
fore200e_tx_irq(struct fore200e* fore200e)
{
struct host_txq* txq = &fore200e->host_txq;
struct host_txq_entry* entry;
struct atm_vcc* vcc;
struct fore200e_vc_map* vc_map;
if (fore200e->host_txq.txing == 0)
return;
for (;;) {
entry = &txq->host_entry[ txq->tail ];
if ((*entry->status & STATUS_COMPLETE) == 0) {
break;
}
DPRINTK(3, "TX COMPLETED: entry = %p [tail = %d], vc_map = %p, skb = %p\n",
entry, txq->tail, entry->vc_map, entry->skb);
/* free copy of misaligned data */
kfree(entry->data);
/* remove DMA mapping */
dma_unmap_single(fore200e->dev, entry->tpd->tsd[ 0 ].buffer, entry->tpd->tsd[ 0 ].length,
DMA_TO_DEVICE);
vc_map = entry->vc_map;
/* vcc closed since the time the entry was submitted for tx? */
if ((vc_map->vcc == NULL) ||
(test_bit(ATM_VF_READY, &vc_map->vcc->flags) == 0)) {
DPRINTK(1, "no ready vcc found for PDU sent on device %d\n",
fore200e->atm_dev->number);
dev_kfree_skb_any(entry->skb);
}
else {
ASSERT(vc_map->vcc);
/* vcc closed then immediately re-opened? */
if (vc_map->incarn != entry->incarn) {
/* when a vcc is closed, some PDUs may be still pending in the tx queue.
if the same vcc is immediately re-opened, those pending PDUs must
not be popped after the completion of their emission, as they refer
to the prior incarnation of that vcc. otherwise, sk_atm(vcc)->sk_wmem_alloc
would be decremented by the size of the (unrelated) skb, possibly
leading to a negative sk->sk_wmem_alloc count, ultimately freezing the vcc.
we thus bind the tx entry to the current incarnation of the vcc
when the entry is submitted for tx. When the tx later completes,
if the incarnation number of the tx entry does not match the one
of the vcc, then this implies that the vcc has been closed then re-opened.
we thus just drop the skb here. */
DPRINTK(1, "vcc closed-then-re-opened; dropping PDU sent on device %d\n",
fore200e->atm_dev->number);
dev_kfree_skb_any(entry->skb);
}
else {
vcc = vc_map->vcc;
ASSERT(vcc);
/* notify tx completion */
if (vcc->pop) {
vcc->pop(vcc, entry->skb);
}
else {
dev_kfree_skb_any(entry->skb);
}
/* check error condition */
if (*entry->status & STATUS_ERROR)
atomic_inc(&vcc->stats->tx_err);
else
atomic_inc(&vcc->stats->tx);
}
}
*entry->status = STATUS_FREE;
fore200e->host_txq.txing--;
FORE200E_NEXT_ENTRY(txq->tail, QUEUE_SIZE_TX);
}
}
#ifdef FORE200E_BSQ_DEBUG
int bsq_audit(int where, struct host_bsq* bsq, int scheme, int magn)
{
struct buffer* buffer;
int count = 0;
buffer = bsq->freebuf;
while (buffer) {
if (buffer->supplied) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, buffer %ld supplied but in free list!\n",
where, scheme, magn, buffer->index);
}
if (buffer->magn != magn) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, buffer %ld, unexpected magn = %d\n",
where, scheme, magn, buffer->index, buffer->magn);
}
if (buffer->scheme != scheme) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, buffer %ld, unexpected scheme = %d\n",
where, scheme, magn, buffer->index, buffer->scheme);
}
if ((buffer->index < 0) || (buffer->index >= fore200e_rx_buf_nbr[ scheme ][ magn ])) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, out of range buffer index = %ld !\n",
where, scheme, magn, buffer->index);
}
count++;
buffer = buffer->next;
}
if (count != bsq->freebuf_count) {
printk(FORE200E "bsq_audit(%d): queue %d.%d, %d bufs in free list, but freebuf_count = %d\n",
where, scheme, magn, count, bsq->freebuf_count);
}
return 0;
}
#endif
static void
fore200e_supply(struct fore200e* fore200e)
{
int scheme, magn, i;
struct host_bsq* bsq;
struct host_bsq_entry* entry;
struct buffer* buffer;
for (scheme = 0; scheme < BUFFER_SCHEME_NBR; scheme++) {
for (magn = 0; magn < BUFFER_MAGN_NBR; magn++) {
bsq = &fore200e->host_bsq[ scheme ][ magn ];
#ifdef FORE200E_BSQ_DEBUG
bsq_audit(1, bsq, scheme, magn);
#endif
while (bsq->freebuf_count >= RBD_BLK_SIZE) {
DPRINTK(2, "supplying %d rx buffers to queue %d / %d, freebuf_count = %d\n",
RBD_BLK_SIZE, scheme, magn, bsq->freebuf_count);
entry = &bsq->host_entry[ bsq->head ];
for (i = 0; i < RBD_BLK_SIZE; i++) {
/* take the first buffer in the free buffer list */
buffer = bsq->freebuf;
if (!buffer) {
printk(FORE200E "no more free bufs in queue %d.%d, but freebuf_count = %d\n",
scheme, magn, bsq->freebuf_count);
return;
}
bsq->freebuf = buffer->next;
#ifdef FORE200E_BSQ_DEBUG
if (buffer->supplied)
printk(FORE200E "queue %d.%d, buffer %lu already supplied\n",
scheme, magn, buffer->index);
buffer->supplied = 1;
#endif
entry->rbd_block->rbd[ i ].buffer_haddr = buffer->data.dma_addr;
entry->rbd_block->rbd[ i ].handle = FORE200E_BUF2HDL(buffer);
}
FORE200E_NEXT_ENTRY(bsq->head, QUEUE_SIZE_BS);
/* decrease accordingly the number of free rx buffers */
bsq->freebuf_count -= RBD_BLK_SIZE;
*entry->status = STATUS_PENDING;
fore200e->bus->write(entry->rbd_block_dma, &entry->cp_entry->rbd_block_haddr);
}
}
}
}
static int
fore200e_push_rpd(struct fore200e* fore200e, struct atm_vcc* vcc, struct rpd* rpd)
{
struct sk_buff* skb;
struct buffer* buffer;
struct fore200e_vcc* fore200e_vcc;
int i, pdu_len = 0;
#ifdef FORE200E_52BYTE_AAL0_SDU
u32 cell_header = 0;
#endif
ASSERT(vcc);
fore200e_vcc = FORE200E_VCC(vcc);
ASSERT(fore200e_vcc);
#ifdef FORE200E_52BYTE_AAL0_SDU
if ((vcc->qos.aal == ATM_AAL0) && (vcc->qos.rxtp.max_sdu == ATM_AAL0_SDU)) {
cell_header = (rpd->atm_header.gfc << ATM_HDR_GFC_SHIFT) |
(rpd->atm_header.vpi << ATM_HDR_VPI_SHIFT) |
(rpd->atm_header.vci << ATM_HDR_VCI_SHIFT) |
(rpd->atm_header.plt << ATM_HDR_PTI_SHIFT) |
rpd->atm_header.clp;
pdu_len = 4;
}
#endif
/* compute total PDU length */
for (i = 0; i < rpd->nseg; i++)
pdu_len += rpd->rsd[ i ].length;
skb = alloc_skb(pdu_len, GFP_ATOMIC);
if (skb == NULL) {
DPRINTK(2, "unable to alloc new skb, rx PDU length = %d\n", pdu_len);
atomic_inc(&vcc->stats->rx_drop);
return -ENOMEM;
}
__net_timestamp(skb);