summaryrefslogtreecommitdiff
path: root/target/linux/ixp4xx/patches-2.6.27/210-npe_hss.patch
blob: c14f4cdc14b08e9c62110dd0e9b3491d9b6436c3 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
--- a/drivers/net/wan/Kconfig
+++ b/drivers/net/wan/Kconfig
@@ -333,6 +333,15 @@
 
 	  Say Y if your card supports this feature.
 
+config IXP4XX_HSS
+	tristate "IXP4xx HSS (synchronous serial port) support"
+	depends on HDLC && ARM && ARCH_IXP4XX
+	select IXP4XX_NPE
+	select IXP4XX_QMGR
+	help
+	  Say Y here if you want to use built-in HSS ports
+	  on IXP4xx processor.
+
 config DLCI
 	tristate "Frame Relay DLCI support"
 	---help---
--- a/drivers/net/wan/Makefile
+++ b/drivers/net/wan/Makefile
@@ -41,6 +41,7 @@
 obj-$(CONFIG_WANXL)		+= wanxl.o
 obj-$(CONFIG_PCI200SYN)		+= pci200syn.o
 obj-$(CONFIG_PC300TOO)		+= pc300too.o
+obj-$(CONFIG_IXP4XX_HSS)	+= ixp4xx_hss.o
 
 clean-files := wanxlfw.inc
 $(obj)/wanxl.o:	$(obj)/wanxlfw.inc
--- /dev/null
+++ b/drivers/net/wan/ixp4xx_hss.c
@@ -0,0 +1,2886 @@
+/*
+ * Intel IXP4xx HSS (synchronous serial port) driver for Linux
+ *
+ * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/bitops.h>
+#include <linux/cdev.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmapool.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/hdlc.h>
+#include <linux/platform_device.h>
+#include <linux/poll.h>
+#include <asm/arch/npe.h>
+#include <asm/arch/qmgr.h>
+
+#define DEBUG_QUEUES		0
+#define DEBUG_DESC		0
+#define DEBUG_RX		0
+#define DEBUG_TX		0
+#define DEBUG_PKT_BYTES		0
+#define DEBUG_CLOSE		0
+#define DEBUG_FRAMER		0
+
+#define DRV_NAME		"ixp4xx_hss"
+
+#define PKT_EXTRA_FLAGS		0 /* orig 1 */
+#define TX_FRAME_SYNC_OFFSET	0 /* channelized */
+#define PKT_NUM_PIPES		1 /* 1, 2 or 4 */
+#define PKT_PIPE_FIFO_SIZEW	4 /* total 4 dwords per HSS */
+
+#define RX_DESCS		16 /* also length of all RX queues */
+#define TX_DESCS		16 /* also length of all TX queues */
+
+#define POOL_ALLOC_SIZE		(sizeof(struct desc) * (RX_DESCS + TX_DESCS))
+#define RX_SIZE			(HDLC_MAX_MRU + 4) /* NPE needs more space */
+#define MAX_CLOSE_WAIT		1000 /* microseconds */
+#define HSS_COUNT		2
+#define MIN_FRAME_SIZE		16   /* bits */
+#define MAX_FRAME_SIZE		257  /* 256 bits + framing bit */
+#define MAX_CHANNELS		(MAX_FRAME_SIZE / 8)
+#define MAX_CHAN_DEVICES	32
+#define CHANNEL_HDLC		0xFE
+#define CHANNEL_UNUSED		0xFF
+
+#define NAPI_WEIGHT		16
+#define CHAN_RX_TRIGGER		16 /* 8 RX frames = 1 ms @ E1 */
+#define CHAN_RX_FRAMES		64
+#define MAX_CHAN_RX_BAD_SYNC	(CHAN_RX_TRIGGER / 2 /* pairs */ - 3)
+#define CHAN_TX_LIST_FRAMES	16 /* bytes/channel per list, 16 - 48 */
+#define CHAN_TX_LISTS		8
+#define CHAN_TX_FRAMES		(CHAN_TX_LIST_FRAMES * CHAN_TX_LISTS)
+#define CHAN_QUEUE_LEN		16 /* minimum possible */
+
+
+/* Queue IDs */
+#define HSS0_CHL_RXTRIG_QUEUE	12	/* orig size = 32 dwords */
+#define HSS0_PKT_RX_QUEUE	13	/* orig size = 32 dwords */
+#define HSS0_PKT_TX0_QUEUE	14	/* orig size = 16 dwords */
+#define HSS0_PKT_TX1_QUEUE	15
+#define HSS0_PKT_TX2_QUEUE	16
+#define HSS0_PKT_TX3_QUEUE	17
+#define HSS0_PKT_RXFREE0_QUEUE	18	/* orig size = 16 dwords */
+#define HSS0_PKT_RXFREE1_QUEUE	19
+#define HSS0_PKT_RXFREE2_QUEUE	20
+#define HSS0_PKT_RXFREE3_QUEUE	21
+#define HSS0_PKT_TXDONE_QUEUE	22	/* orig size = 64 dwords */
+
+#define HSS1_CHL_RXTRIG_QUEUE	10
+#define HSS1_PKT_RX_QUEUE	0
+#define HSS1_PKT_TX0_QUEUE	5
+#define HSS1_PKT_TX1_QUEUE	6
+#define HSS1_PKT_TX2_QUEUE	7
+#define HSS1_PKT_TX3_QUEUE	8
+#define HSS1_PKT_RXFREE0_QUEUE	1
+#define HSS1_PKT_RXFREE1_QUEUE	2
+#define HSS1_PKT_RXFREE2_QUEUE	3
+#define HSS1_PKT_RXFREE3_QUEUE	4
+#define HSS1_PKT_TXDONE_QUEUE	9
+
+#define NPE_PKT_MODE_HDLC		0
+#define NPE_PKT_MODE_RAW		1
+#define NPE_PKT_MODE_56KMODE		2
+#define NPE_PKT_MODE_56KENDIAN_MSB	4
+
+/* PKT_PIPE_HDLC_CFG_WRITE flags */
+#define PKT_HDLC_IDLE_ONES		0x1 /* default = flags */
+#define PKT_HDLC_CRC_32			0x2 /* default = CRC-16 */
+#define PKT_HDLC_MSB_ENDIAN		0x4 /* default = LE */
+
+
+/* hss_config, PCRs */
+/* Frame sync sampling, default = active low */
+#define PCR_FRM_SYNC_ACTIVE_HIGH	0x40000000
+#define PCR_FRM_SYNC_FALLINGEDGE	0x80000000
+#define PCR_FRM_SYNC_RISINGEDGE		0xC0000000
+
+/* Frame sync pin: input (default) or output generated off a given clk edge */
+#define PCR_FRM_SYNC_OUTPUT_FALLING	0x20000000
+#define PCR_FRM_SYNC_OUTPUT_RISING	0x30000000
+
+/* Frame and data clock sampling on edge, default = falling */
+#define PCR_FCLK_EDGE_RISING		0x08000000
+#define PCR_DCLK_EDGE_RISING		0x04000000
+
+/* Clock direction, default = input */
+#define PCR_SYNC_CLK_DIR_OUTPUT		0x02000000
+
+/* Generate/Receive frame pulses, default = enabled */
+#define PCR_FRM_PULSE_DISABLED		0x01000000
+
+ /* Data rate is full (default) or half the configured clk speed */
+#define PCR_HALF_CLK_RATE		0x00200000
+
+/* Invert data between NPE and HSS FIFOs? (default = no) */
+#define PCR_DATA_POLARITY_INVERT	0x00100000
+
+/* TX/RX endianness, default = LSB */
+#define PCR_MSB_ENDIAN			0x00080000
+
+/* Normal (default) / open drain mode (TX only) */
+#define PCR_TX_PINS_OPEN_DRAIN		0x00040000
+
+/* No framing bit transmitted and expected on RX? (default = framing bit) */
+#define PCR_SOF_NO_FBIT			0x00020000
+
+/* Drive data pins? */
+#define PCR_TX_DATA_ENABLE		0x00010000
+
+/* Voice 56k type: drive the data pins low (default), high, high Z */
+#define PCR_TX_V56K_HIGH		0x00002000
+#define PCR_TX_V56K_HIGH_IMP		0x00004000
+
+/* Unassigned type: drive the data pins low (default), high, high Z */
+#define PCR_TX_UNASS_HIGH		0x00000800
+#define PCR_TX_UNASS_HIGH_IMP		0x00001000
+
+/* T1 @ 1.544MHz only: Fbit dictated in FIFO (default) or high Z */
+#define PCR_TX_FB_HIGH_IMP		0x00000400
+
+/* 56k data endiannes - which bit unused: high (default) or low */
+#define PCR_TX_56KE_BIT_0_UNUSED	0x00000200
+
+/* 56k data transmission type: 32/8 bit data (default) or 56K data */
+#define PCR_TX_56KS_56K_DATA		0x00000100
+
+/* hss_config, cCR */
+/* Number of packetized clients, default = 1 */
+#define CCR_NPE_HFIFO_2_HDLC		0x04000000
+#define CCR_NPE_HFIFO_3_OR_4HDLC	0x08000000
+
+/* default = no loopback */
+#define CCR_LOOPBACK			0x02000000
+
+/* HSS number, default = 0 (first) */
+#define CCR_SECOND_HSS			0x01000000
+
+
+/* hss_config, clkCR: main:10, num:10, denom:12 */
+#define CLK42X_SPEED_EXP	((0x3FF << 22) | (  2 << 12) |   15) /*65 KHz*/
+
+#define CLK42X_SPEED_512KHZ	((  130 << 22) | (  2 << 12) |   15)
+#define CLK42X_SPEED_1536KHZ	((   43 << 22) | ( 18 << 12) |   47)
+#define CLK42X_SPEED_1544KHZ	((   43 << 22) | ( 33 << 12) |  192)
+#define CLK42X_SPEED_2048KHZ	((   32 << 22) | ( 34 << 12) |   63)
+#define CLK42X_SPEED_4096KHZ	((   16 << 22) | ( 34 << 12) |  127)
+#define CLK42X_SPEED_8192KHZ	((    8 << 22) | ( 34 << 12) |  255)
+
+#define CLK46X_SPEED_512KHZ	((  130 << 22) | ( 24 << 12) |  127)
+#define CLK46X_SPEED_1536KHZ	((   43 << 22) | (152 << 12) |  383)
+#define CLK46X_SPEED_1544KHZ	((   43 << 22) | ( 66 << 12) |  385)
+#define CLK46X_SPEED_2048KHZ	((   32 << 22) | (280 << 12) |  511)
+#define CLK46X_SPEED_4096KHZ	((   16 << 22) | (280 << 12) | 1023)
+#define CLK46X_SPEED_8192KHZ	((    8 << 22) | (280 << 12) | 2047)
+
+
+/* hss_config, LUT entries */
+#define TDMMAP_UNASSIGNED	0
+#define TDMMAP_HDLC		1	/* HDLC - packetized */
+#define TDMMAP_VOICE56K		2	/* Voice56K - 7-bit channelized */
+#define TDMMAP_VOICE64K		3	/* Voice64K - 8-bit channelized */
+
+/* offsets into HSS config */
+#define HSS_CONFIG_TX_PCR	0x00 /* port configuration registers */
+#define HSS_CONFIG_RX_PCR	0x04
+#define HSS_CONFIG_CORE_CR	0x08 /* loopback control, HSS# */
+#define HSS_CONFIG_CLOCK_CR	0x0C /* clock generator control */
+#define HSS_CONFIG_TX_FCR	0x10 /* frame configuration registers */
+#define HSS_CONFIG_RX_FCR	0x14
+#define HSS_CONFIG_TX_LUT	0x18 /* channel look-up tables */
+#define HSS_CONFIG_RX_LUT	0x38
+
+
+/* NPE command codes */
+/* writes the ConfigWord value to the location specified by offset */
+#define PORT_CONFIG_WRITE		0x40
+
+/* triggers the NPE to load the contents of the configuration table */
+#define PORT_CONFIG_LOAD		0x41
+
+/* triggers the NPE to return an HssErrorReadResponse message */
+#define PORT_ERROR_READ			0x42
+
+/* reset NPE internal status and enable the HssChannelized operation */
+#define CHAN_FLOW_ENABLE		0x43
+#define CHAN_FLOW_DISABLE		0x44
+#define CHAN_IDLE_PATTERN_WRITE		0x45
+#define CHAN_NUM_CHANS_WRITE		0x46
+#define CHAN_RX_BUF_ADDR_WRITE		0x47
+#define CHAN_RX_BUF_CFG_WRITE		0x48
+#define CHAN_TX_BLK_CFG_WRITE		0x49
+#define CHAN_TX_BUF_ADDR_WRITE		0x4A
+#define CHAN_TX_BUF_SIZE_WRITE		0x4B
+#define CHAN_TSLOTSWITCH_ENABLE		0x4C
+#define CHAN_TSLOTSWITCH_DISABLE	0x4D
+
+/* downloads the gainWord value for a timeslot switching channel associated
+   with bypassNum */
+#define CHAN_TSLOTSWITCH_GCT_DOWNLOAD	0x4E
+
+/* triggers the NPE to reset internal status and enable the HssPacketized
+   operation for the flow specified by pPipe */
+#define PKT_PIPE_FLOW_ENABLE		0x50
+#define PKT_PIPE_FLOW_DISABLE		0x51
+#define PKT_NUM_PIPES_WRITE		0x52
+#define PKT_PIPE_FIFO_SIZEW_WRITE	0x53
+#define PKT_PIPE_HDLC_CFG_WRITE		0x54
+#define PKT_PIPE_IDLE_PATTERN_WRITE	0x55
+#define PKT_PIPE_RX_SIZE_WRITE		0x56
+#define PKT_PIPE_MODE_WRITE		0x57
+
+/* HDLC packet status values - desc->status */
+#define ERR_SHUTDOWN		1 /* stop or shutdown occurrance */
+#define ERR_HDLC_ALIGN		2 /* HDLC alignment error */
+#define ERR_HDLC_FCS		3 /* HDLC Frame Check Sum error */
+#define ERR_RXFREE_Q_EMPTY	4 /* RX-free queue became empty while receiving
+				     this packet (if buf_len < pkt_len) */
+#define ERR_HDLC_TOO_LONG	5 /* HDLC frame size too long */
+#define ERR_HDLC_ABORT		6 /* abort sequence received */
+#define ERR_DISCONNECTING	7 /* disconnect is in progress */
+
+
+enum mode {MODE_HDLC = 0, MODE_RAW, MODE_G704};
+enum error_bit {TX_ERROR_BIT = 0, RX_ERROR_BIT = 1};
+enum alignment { NOT_ALIGNED = 0, EVEN_FIRST, ODD_FIRST };
+
+#ifdef __ARMEB__
+typedef struct sk_buff buffer_t;
+#define free_buffer dev_kfree_skb
+#define free_buffer_irq dev_kfree_skb_irq
+#else
+typedef void buffer_t;
+#define free_buffer kfree
+#define free_buffer_irq kfree
+#endif
+
+struct chan_device {
+	struct cdev cdev;
+	struct device *dev;
+	struct port *port;
+	unsigned int open_count, excl_open;
+	unsigned int tx_first, tx_count, rx_first, rx_count; /* bytes */
+	unsigned long errors_bitmap;
+	u8 id, chan_count;
+	u8 log_channels[MAX_CHANNELS];
+};
+
+struct port {
+	struct device *dev;
+	struct npe *npe;
+	struct net_device *netdev;
+	struct napi_struct napi;
+	struct hss_plat_info *plat;
+	buffer_t *rx_buff_tab[RX_DESCS], *tx_buff_tab[TX_DESCS];
+	struct desc *desc_tab;	/* coherent */
+	u32 desc_tab_phys;
+	unsigned int id;
+	atomic_t chan_tx_irq_number, chan_rx_irq_number;
+	wait_queue_head_t chan_tx_waitq, chan_rx_waitq;
+	u8 hdlc_cfg;
+
+	/* the following fields must be protected by npe_lock */
+	enum mode mode;
+	unsigned int clock_type, clock_rate, loopback;
+	unsigned int frame_size, frame_sync_offset;
+
+	struct chan_device *chan_devices[MAX_CHAN_DEVICES];
+	u8 *chan_buf;
+	u32 chan_tx_buf_phys, chan_rx_buf_phys;
+	unsigned int chan_open_count, hdlc_open;
+	unsigned int chan_started, initialized, just_set_offset;
+	enum alignment aligned, carrier;
+	unsigned int chan_last_rx, chan_last_tx;
+	/* assigned channels, may be invalid with given frame length or mode */
+	u8 channels[MAX_CHANNELS];
+	int msg_count;
+};
+
+/* NPE message structure */
+struct msg {
+#ifdef __ARMEB__
+	u8 cmd, unused, hss_port, index;
+	union {
+		struct { u8 data8a, data8b, data8c, data8d; };
+		struct { u16 data16a, data16b; };
+		struct { u32 data32; };
+	};
+#else
+	u8 index, hss_port, unused, cmd;
+	union {
+		struct { u8 data8d, data8c, data8b, data8a; };
+		struct { u16 data16b, data16a; };
+		struct { u32 data32; };
+	};
+#endif
+};
+
+/* HDLC packet descriptor */
+struct desc {
+	u32 next;		/* pointer to next buffer, unused */
+
+#ifdef __ARMEB__
+	u16 buf_len;		/* buffer length */
+	u16 pkt_len;		/* packet length */
+	u32 data;		/* pointer to data buffer in RAM */
+	u8 status;
+	u8 error_count;
+	u16 __reserved;
+#else
+	u16 pkt_len;		/* packet length */
+	u16 buf_len;		/* buffer length */
+	u32 data;		/* pointer to data buffer in RAM */
+	u16 __reserved;
+	u8 error_count;
+	u8 status;
+#endif
+	u32 __reserved1[4];
+};
+
+
+#define rx_desc_phys(port, n)	((port)->desc_tab_phys +		\
+				 (n) * sizeof(struct desc))
+#define rx_desc_ptr(port, n)	(&(port)->desc_tab[n])
+
+#define tx_desc_phys(port, n)	((port)->desc_tab_phys +		\
+				 ((n) + RX_DESCS) * sizeof(struct desc))
+#define tx_desc_ptr(port, n)	(&(port)->desc_tab[(n) + RX_DESCS])
+
+#define chan_tx_buf_len(port)	(port->frame_size / 8 * CHAN_TX_FRAMES)
+#define chan_tx_lists_len(port)	(port->frame_size / 8 * CHAN_TX_LISTS * \
+				 sizeof(u32))
+#define chan_rx_buf_len(port)	(port->frame_size / 8 * CHAN_RX_FRAMES)
+
+#define chan_tx_buf(port)	((port)->chan_buf)
+#define chan_tx_lists(port)	(chan_tx_buf(port) + chan_tx_buf_len(port))
+#define chan_rx_buf(port)	(chan_tx_lists(port) + chan_tx_lists_len(port))
+
+#define chan_tx_lists_phys(port) ((port)->chan_tx_buf_phys +	\
+				  chan_tx_buf_len(port))
+
+static int hss_prepare_chan(struct port *port);
+void hss_chan_stop(struct port *port);
+
+/*****************************************************************************
+ * global variables
+ ****************************************************************************/
+
+static struct class *hss_class;
+static int chan_major;
+static int ports_open;
+static struct dma_pool *dma_pool;
+static spinlock_t npe_lock;
+
+static const struct {
+	int tx, txdone, rx, rxfree, chan;
+}queue_ids[2] = {{HSS0_PKT_TX0_QUEUE, HSS0_PKT_TXDONE_QUEUE, HSS0_PKT_RX_QUEUE,
+		  HSS0_PKT_RXFREE0_QUEUE, HSS0_CHL_RXTRIG_QUEUE},
+		 {HSS1_PKT_TX0_QUEUE, HSS1_PKT_TXDONE_QUEUE, HSS1_PKT_RX_QUEUE,
+		  HSS1_PKT_RXFREE0_QUEUE, HSS1_CHL_RXTRIG_QUEUE},
+};
+
+/*****************************************************************************
+ * utility functions
+ ****************************************************************************/
+
+static inline struct port* dev_to_port(struct net_device *dev)
+{
+	return dev_to_hdlc(dev)->priv;
+}
+
+static inline struct chan_device* inode_to_chan_dev(struct inode *inode)
+{
+	return container_of(inode->i_cdev, struct chan_device, cdev);
+}
+
+#ifndef __ARMEB__
+static inline void memcpy_swab32(u32 *dest, u32 *src, int cnt)
+{
+	int i;
+	for (i = 0; i < cnt; i++)
+		dest[i] = swab32(src[i]);
+}
+#endif
+
+static int get_number(const char **buf, size_t *len, unsigned int *ptr,
+		      unsigned int min, unsigned int max)
+{
+	char *endp;
+	unsigned long val = simple_strtoul(*buf, &endp, 10);
+
+	if (endp == *buf || endp - *buf > *len || val < min || val > max)
+		return -EINVAL;
+	*len -= endp - *buf;
+	*buf = endp;
+	*ptr = val;
+	return 0;
+}
+
+static int parse_channels(const char **buf, size_t *len, u8 *channels)
+{
+	unsigned int ch, next = 0;
+
+	if (*len && (*buf)[*len - 1] == '\n')
+		(*len)--;
+
+	memset(channels, 0, MAX_CHANNELS);
+
+	if (!*len)
+		return 0;
+
+	/* Format: "A,B-C,...", A > B > C */
+	while (1) {
+		if (get_number(buf, len, &ch, next, MAX_CHANNELS - 1))
+			return -EINVAL;
+		channels[ch] = 1;
+		next = ch + 1;
+		if (!*len)
+			break;
+		if (**buf == ',') {
+			(*buf)++;
+			(*len)--;
+			continue;
+		}
+		if (**buf != '-')
+			return -EINVAL;
+		(*buf)++;
+		(*len)--;
+		if (get_number(buf, len, &ch, next, MAX_CHANNELS - 1))
+			return -EINVAL;
+		while (next <= ch)
+			channels[next++] = 1;
+		if (!*len)
+			break;
+		if (**buf != ',')
+			return -EINVAL;
+		(*buf)++;
+		(*len)--;
+	}
+	return 1;
+}
+
+static size_t print_channels(struct port *port, char *buf, u8 id)
+{
+	unsigned int ch, cnt = 0;
+	size_t len = 0;
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++)
+		if (port->channels[ch] == id) {
+			if (cnt == 0) {
+				sprintf(buf + len, "%s%u", len ? "," : "", ch);
+				len += strlen(buf + len);
+			}
+			cnt++;
+		} else {
+			if (cnt > 1) {
+				sprintf(buf + len, "-%u", ch - 1);
+				len += strlen(buf + len);
+			}
+			cnt = 0;
+		}
+	if (cnt > 1) {
+		sprintf(buf + len, "-%u", ch - 1);
+		len += strlen(buf + len);
+	}
+
+	buf[len++] = '\n';
+	return len;
+}
+
+static inline unsigned int sub_offset(unsigned int a, unsigned int b,
+				      unsigned int modulo)
+{
+	return (modulo /* make sure the result >= 0 */ + a - b) % modulo;
+}
+
+/*****************************************************************************
+ * HSS access
+ ****************************************************************************/
+
+static void hss_config_load(struct port *port)
+{
+	struct msg msg;
+
+	do {
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = PORT_CONFIG_LOAD;
+		msg.hss_port = port->id;
+		if (npe_send_message(port->npe, &msg, "HSS_LOAD_CONFIG"))
+			break;
+		if (npe_recv_message(port->npe, &msg, "HSS_LOAD_CONFIG"))
+			break;
+
+		/* HSS_LOAD_CONFIG for port #1 returns port_id = #4 */
+		if (msg.cmd != PORT_CONFIG_LOAD || msg.data32)
+			break;
+
+		/* HDLC may stop working without this */
+		npe_recv_message(port->npe, &msg, "FLUSH_IT");
+		return;
+	} while (0);
+
+	printk(KERN_CRIT "HSS-%i: unable to reload HSS configuration\n",
+	       port->id);
+	BUG();
+}
+
+static void hss_config_set_pcr(struct port *port)
+{
+	struct msg msg;
+
+	do {
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = PORT_CONFIG_WRITE;
+		msg.hss_port = port->id;
+		msg.index = HSS_CONFIG_TX_PCR;
+		msg.data32 = PCR_FRM_SYNC_OUTPUT_RISING | PCR_MSB_ENDIAN |
+			PCR_TX_DATA_ENABLE;
+		if (port->frame_size % 8 == 0)
+			msg.data32 |= PCR_SOF_NO_FBIT;
+		if (port->clock_type == CLOCK_INT)
+			msg.data32 |= PCR_SYNC_CLK_DIR_OUTPUT;
+		if (npe_send_message(port->npe, &msg, "HSS_SET_TX_PCR"))
+			break;
+
+		msg.index = HSS_CONFIG_RX_PCR;
+		msg.data32 ^= PCR_TX_DATA_ENABLE | PCR_DCLK_EDGE_RISING;
+		if (npe_send_message(port->npe, &msg, "HSS_SET_RX_PCR"))
+			break;
+		return;
+	} while (0);
+
+	printk(KERN_CRIT "HSS-%i: unable to set HSS PCR registers\n", port->id);
+	BUG();
+}
+
+static void hss_config_set_hdlc_cfg(struct port *port)
+{
+	struct msg msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PKT_PIPE_HDLC_CFG_WRITE;
+	msg.hss_port = port->id;
+	msg.data8a = port->hdlc_cfg; /* rx_cfg */
+	msg.data8b = port->hdlc_cfg | (PKT_EXTRA_FLAGS << 3); /* tx_cfg */
+	if (npe_send_message(port->npe, &msg, "HSS_SET_HDLC_CFG")) {
+		printk(KERN_CRIT "HSS-%i: unable to set HSS HDLC"
+		       " configuration\n", port->id);
+		BUG();
+	}
+}
+
+static void hss_config_set_core(struct port *port)
+{
+	struct msg msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PORT_CONFIG_WRITE;
+	msg.hss_port = port->id;
+	msg.index = HSS_CONFIG_CORE_CR;
+	msg.data32 = (port->loopback ? CCR_LOOPBACK : 0) |
+		(port->id ? CCR_SECOND_HSS : 0);
+	if (npe_send_message(port->npe, &msg, "HSS_SET_CORE_CR")) {
+		printk(KERN_CRIT "HSS-%i: unable to set HSS core control"
+		       " register\n", port->id);
+		BUG();
+	}
+}
+
+static void hss_config_set_line(struct port *port)
+{
+	struct msg msg;
+
+	hss_config_set_pcr(port);
+	hss_config_set_core(port);
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PORT_CONFIG_WRITE;
+	msg.hss_port = port->id;
+	msg.index = HSS_CONFIG_CLOCK_CR;
+	msg.data32 = CLK42X_SPEED_2048KHZ /* FIXME */;
+	if (npe_send_message(port->npe, &msg, "HSS_SET_CLOCK_CR")) {
+		printk(KERN_CRIT "HSS-%i: unable to set HSS clock control"
+		       " register\n", port->id);
+		BUG();
+	}
+}
+
+static void hss_config_set_rx_frame(struct port *port)
+{
+	struct msg msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PORT_CONFIG_WRITE;
+	msg.hss_port = port->id;
+	msg.index = HSS_CONFIG_RX_FCR;
+	msg.data16a = port->frame_sync_offset;
+	msg.data16b = port->frame_size - 1;
+	if (npe_send_message(port->npe, &msg, "HSS_SET_RX_FCR")) {
+		printk(KERN_CRIT "HSS-%i: unable to set HSS RX frame size"
+		       " and offset\n", port->id);
+		BUG();
+	}
+}
+
+static void hss_config_set_frame(struct port *port)
+{
+	struct msg msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PORT_CONFIG_WRITE;
+	msg.hss_port = port->id;
+	msg.index = HSS_CONFIG_TX_FCR;
+	msg.data16a = TX_FRAME_SYNC_OFFSET;
+	msg.data16b = port->frame_size - 1;
+	if (npe_send_message(port->npe, &msg, "HSS_SET_TX_FCR")) {
+		printk(KERN_CRIT "HSS-%i: unable to set HSS TX frame size"
+		       " and offset\n", port->id);
+		BUG();
+	}
+	hss_config_set_rx_frame(port);
+}
+
+static void hss_config_set_lut(struct port *port)
+{
+	struct msg msg;
+	int chan_count = 0, log_chan = 0, i, ch;
+	u32 lut[MAX_CHANNELS / 4];
+
+	memset(lut, 0, sizeof(lut));
+	for (i = 0; i < MAX_CHAN_DEVICES; i++)
+		if (port->chan_devices[i])
+			port->chan_devices[i]->chan_count = 0;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PORT_CONFIG_WRITE;
+	msg.hss_port = port->id;
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++) {
+		struct chan_device *chdev = NULL;
+		unsigned int entry;
+
+		if (port->channels[ch] < MAX_CHAN_DEVICES /* assigned */)
+			chdev = port->chan_devices[port->channels[ch]];
+
+		if (port->mode == MODE_G704 && ch == 0)
+			entry = TDMMAP_VOICE64K; /* PCM-31 pattern */
+		else if (port->mode == MODE_HDLC ||
+			 port->channels[ch] == CHANNEL_HDLC)
+			entry = TDMMAP_HDLC;
+		else if (chdev && chdev->open_count) {
+			entry = TDMMAP_VOICE64K;
+			chdev->log_channels[chdev->chan_count++] = log_chan;
+		} else
+			entry = TDMMAP_UNASSIGNED;
+		if (entry == TDMMAP_VOICE64K) {
+			chan_count++;
+			log_chan++;
+		}
+
+		msg.data32 >>= 2;
+		msg.data32 |= entry << 30;
+
+		if (ch % 16 == 15) {
+			msg.index = HSS_CONFIG_TX_LUT + ((ch / 4) & ~3);
+			if (npe_send_message(port->npe, &msg, "HSS_SET_TX_LUT"))
+				break;
+
+			msg.index += HSS_CONFIG_RX_LUT - HSS_CONFIG_TX_LUT;
+			if (npe_send_message(port->npe, &msg, "HSS_SET_RX_LUT"))
+				break;
+		}
+	}
+	if (ch != MAX_CHANNELS) {
+		printk(KERN_CRIT "HSS-%i: unable to set HSS channel look-up"
+		       " table\n", port->id);
+		BUG();
+	}
+
+	hss_config_set_frame(port);
+
+	if (!chan_count)
+		return;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = CHAN_NUM_CHANS_WRITE;
+	msg.hss_port = port->id;
+	msg.data8a = chan_count;
+	if (npe_send_message(port->npe, &msg, "CHAN_NUM_CHANS_WRITE")) {
+		printk(KERN_CRIT "HSS-%i: unable to set HSS channel count\n",
+		       port->id);
+		BUG();
+	}
+
+	/* don't leak data */
+	// FIXME memset(chan_tx_buf(port), 0, CHAN_TX_FRAMES * chan_count);
+	if (port->mode == MODE_G704) /* G.704 PCM-31 sync pattern */
+		for (i = 0; i < CHAN_TX_FRAMES; i += 4)
+			*(u32*)(chan_tx_buf(port) + i) = 0x9BDF9BDF;
+
+	for (i = 0; i < CHAN_TX_LISTS; i++) {
+		u32 phys = port->chan_tx_buf_phys + i * CHAN_TX_LIST_FRAMES;
+		u32 *list = ((u32 *)chan_tx_lists(port)) + i * chan_count;
+		for (ch = 0; ch < chan_count; ch++)
+			list[ch] = phys + ch * CHAN_TX_FRAMES;
+	}
+	dma_sync_single(port->dev, port->chan_tx_buf_phys,
+			chan_tx_buf_len(port) + chan_tx_lists_len(port),
+			DMA_TO_DEVICE);
+}
+
+static u32 hss_config_get_status(struct port *port)
+{
+	struct msg msg;
+
+	do {
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = PORT_ERROR_READ;
+		msg.hss_port = port->id;
+		if (npe_send_message(port->npe, &msg, "PORT_ERROR_READ"))
+			break;
+		if (npe_recv_message(port->npe, &msg, "PORT_ERROR_READ"))
+			break;
+
+		return msg.data32;
+	} while (0);
+
+	printk(KERN_CRIT "HSS-%i: unable to read HSS status\n", port->id);
+	BUG();
+}
+
+static void hss_config_start_chan(struct port *port)
+{
+	struct msg msg;
+
+	port->chan_last_tx = 0;
+	port->chan_last_rx = 0;
+
+	do {
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = CHAN_RX_BUF_ADDR_WRITE;
+		msg.hss_port = port->id;
+		msg.data32 = port->chan_rx_buf_phys;
+		if (npe_send_message(port->npe, &msg, "CHAN_RX_BUF_ADDR_WRITE"))
+			break;
+
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = CHAN_TX_BUF_ADDR_WRITE;
+		msg.hss_port = port->id;
+		msg.data32 = chan_tx_lists_phys(port);
+		if (npe_send_message(port->npe, &msg, "CHAN_TX_BUF_ADDR_WRITE"))
+			break;
+
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = CHAN_FLOW_ENABLE;
+		msg.hss_port = port->id;
+		if (npe_send_message(port->npe, &msg, "CHAN_FLOW_ENABLE"))
+			break;
+		port->chan_started = 1;
+		return;
+	} while (0);
+
+	printk(KERN_CRIT "HSS-%i: unable to start channelized flow\n",
+	       port->id);
+	BUG();
+}
+
+static void hss_config_stop_chan(struct port *port)
+{
+	struct msg msg;
+
+	if (!port->chan_started)
+		return;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = CHAN_FLOW_DISABLE;
+	msg.hss_port = port->id;
+	if (npe_send_message(port->npe, &msg, "CHAN_FLOW_DISABLE")) {
+		printk(KERN_CRIT "HSS-%i: unable to stop channelized flow\n",
+		       port->id);
+		BUG();
+	}
+	hss_config_get_status(port); /* make sure it's halted */
+}
+
+static void hss_config_start_hdlc(struct port *port)
+{
+	struct msg msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PKT_PIPE_FLOW_ENABLE;
+	msg.hss_port = port->id;
+	msg.data32 = 0;
+	if (npe_send_message(port->npe, &msg, "HSS_ENABLE_PKT_PIPE")) {
+		printk(KERN_CRIT "HSS-%i: unable to stop packetized flow\n",
+		       port->id);
+		BUG();
+	}
+}
+
+static void hss_config_stop_hdlc(struct port *port)
+{
+	struct msg msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.cmd = PKT_PIPE_FLOW_DISABLE;
+	msg.hss_port = port->id;
+	if (npe_send_message(port->npe, &msg, "HSS_DISABLE_PKT_PIPE")) {
+		printk(KERN_CRIT "HSS-%i: unable to stop packetized flow\n",
+		       port->id);
+		BUG();
+	}
+	hss_config_get_status(port); /* make sure it's halted */
+}
+
+static int hss_config_load_firmware(struct port *port)
+{
+	struct msg msg;
+
+	if (port->initialized)
+		return 0;
+
+	if (!npe_running(port->npe)) {
+		int err;
+		if ((err = npe_load_firmware(port->npe, npe_name(port->npe),
+					     port->dev)))
+			return err;
+	}
+
+	do {
+		/* HSS main configuration */
+		hss_config_set_line(port);
+
+		hss_config_set_frame(port);
+
+		/* HDLC mode configuration */
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = PKT_NUM_PIPES_WRITE;
+		msg.hss_port = port->id;
+		msg.data8a = PKT_NUM_PIPES;
+		if (npe_send_message(port->npe, &msg, "HSS_SET_PKT_PIPES"))
+			break;
+
+		msg.cmd = PKT_PIPE_FIFO_SIZEW_WRITE;
+		msg.data8a = PKT_PIPE_FIFO_SIZEW;
+		if (npe_send_message(port->npe, &msg, "HSS_SET_PKT_FIFO"))
+			break;
+
+		msg.cmd = PKT_PIPE_MODE_WRITE;
+		msg.data8a = NPE_PKT_MODE_HDLC;
+		/* msg.data8b = inv_mask */
+		/* msg.data8c = or_mask */
+		if (npe_send_message(port->npe, &msg, "HSS_SET_PKT_MODE"))
+			break;
+
+		msg.cmd = PKT_PIPE_RX_SIZE_WRITE;
+		msg.data16a = HDLC_MAX_MRU; /* including CRC */
+		if (npe_send_message(port->npe, &msg, "HSS_SET_PKT_RX_SIZE"))
+			break;
+
+		msg.cmd = PKT_PIPE_IDLE_PATTERN_WRITE;
+		msg.data32 = 0x7F7F7F7F; /* ??? FIXME */
+		if (npe_send_message(port->npe, &msg, "HSS_SET_PKT_IDLE"))
+			break;
+
+		/* Channelized operation settings */
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = CHAN_TX_BLK_CFG_WRITE;
+		msg.hss_port = port->id;
+		msg.data8b = (CHAN_TX_LIST_FRAMES & ~7) / 2;
+		msg.data8a = msg.data8b / 4;
+		msg.data8d = CHAN_TX_LIST_FRAMES - msg.data8b;
+		msg.data8c = msg.data8d / 4;
+		if (npe_send_message(port->npe, &msg, "CHAN_TX_BLK_CFG_WRITE"))
+			break;
+
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = CHAN_RX_BUF_CFG_WRITE;
+		msg.hss_port = port->id;
+		msg.data8a = CHAN_RX_TRIGGER / 8;
+		msg.data8b = CHAN_RX_FRAMES;
+		if (npe_send_message(port->npe, &msg, "CHAN_RX_BUF_CFG_WRITE"))
+			break;
+
+		memset(&msg, 0, sizeof(msg));
+		msg.cmd = CHAN_TX_BUF_SIZE_WRITE;
+		msg.hss_port = port->id;
+		msg.data8a = CHAN_TX_LISTS;
+		if (npe_send_message(port->npe, &msg, "CHAN_TX_BUF_SIZE_WRITE"))
+			break;
+
+		port->initialized = 1;
+		return 0;
+	} while (0);
+
+	printk(KERN_CRIT "HSS-%i: unable to start HSS operation\n", port->id);
+	BUG();
+}
+
+/*****************************************************************************
+ * packetized (HDLC) operation
+ ****************************************************************************/
+
+static inline void debug_pkt(struct net_device *dev, const char *func,
+			     u8 *data, int len)
+{
+#if DEBUG_PKT_BYTES
+	int i;
+
+	printk(KERN_DEBUG "%s: %s(%i) ", dev->name, func, len);
+	for (i = 0; i < len; i++) {
+		if (i >= DEBUG_PKT_BYTES)
+			break;
+		printk(KERN_DEBUG "%s%02X", !(i % 4) ? " " : "", data[i]);
+	}
+	printk(KERN_DEBUG "\n");
+#endif
+}
+
+
+static inline void debug_desc(u32 phys, struct desc *desc)
+{
+#if DEBUG_DESC
+	printk(KERN_DEBUG "%X: %X %3X %3X %08X %X %X\n",
+	       phys, desc->next, desc->buf_len, desc->pkt_len,
+	       desc->data, desc->status, desc->error_count);
+#endif
+}
+
+static inline void debug_queue(unsigned int queue, int is_get, u32 phys)
+{
+#if DEBUG_QUEUES
+	static struct {
+		int queue;
+		char *name;
+	} names[] = {
+		{ HSS0_PKT_TX0_QUEUE, "TX#0 " },
+		{ HSS0_PKT_TXDONE_QUEUE, "TX-done#0 " },
+		{ HSS0_PKT_RX_QUEUE, "RX#0 " },
+		{ HSS0_PKT_RXFREE0_QUEUE, "RX-free#0 " },
+		{ HSS1_PKT_TX0_QUEUE, "TX#1 " },
+		{ HSS1_PKT_TXDONE_QUEUE, "TX-done#1 " },
+		{ HSS1_PKT_RX_QUEUE, "RX#1 " },
+		{ HSS1_PKT_RXFREE0_QUEUE, "RX-free#1 " },
+	};
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(names); i++)
+		if (names[i].queue == queue)
+			break;
+
+	printk(KERN_DEBUG "Queue %i %s%s %X\n", queue,
+	       i < ARRAY_SIZE(names) ? names[i].name : "",
+	       is_get ? "->" : "<-", phys);
+#endif
+}
+
+static inline u32 queue_get_entry(unsigned int queue)
+{
+	u32 phys = qmgr_get_entry(queue);
+	debug_queue(queue, 1, phys);
+	return phys;
+}
+
+static inline int queue_get_desc(unsigned int queue, struct port *port,
+				 int is_tx)
+{
+	u32 phys, tab_phys, n_desc;
+	struct desc *tab;
+
+	if (!(phys = queue_get_entry(queue)))
+		return -1;
+
+	BUG_ON(phys & 0x1F);
+	tab_phys = is_tx ? tx_desc_phys(port, 0) : rx_desc_phys(port, 0);
+	tab = is_tx ? tx_desc_ptr(port, 0) : rx_desc_ptr(port, 0);
+	n_desc = (phys - tab_phys) / sizeof(struct desc);
+	BUG_ON(n_desc >= (is_tx ? TX_DESCS : RX_DESCS));
+	debug_desc(phys, &tab[n_desc]);
+	BUG_ON(tab[n_desc].next);
+	return n_desc;
+}
+
+static inline void queue_put_desc(unsigned int queue, u32 phys,
+				  struct desc *desc)
+{
+	debug_queue(queue, 0, phys);
+	debug_desc(phys, desc);
+	BUG_ON(phys & 0x1F);
+	qmgr_put_entry(queue, phys);
+	BUG_ON(qmgr_stat_overflow(queue));
+}
+
+
+static inline void dma_unmap_tx(struct port *port, struct desc *desc)
+{
+#ifdef __ARMEB__
+	dma_unmap_single(&port->netdev->dev, desc->data,
+			 desc->buf_len, DMA_TO_DEVICE);
+#else
+	dma_unmap_single(&port->netdev->dev, desc->data & ~3,
+			 ALIGN((desc->data & 3) + desc->buf_len, 4),
+			 DMA_TO_DEVICE);
+#endif
+}
+
+
+static void hss_hdlc_set_carrier(void *pdev, int carrier)
+{
+	struct net_device *netdev = pdev;
+	struct port *port = dev_to_port(netdev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&npe_lock, flags);
+	port->carrier = carrier;
+	if (!port->loopback) {
+		if (carrier)
+			netif_carrier_on(netdev);
+		else
+			netif_carrier_off(netdev);
+	}
+	spin_unlock_irqrestore(&npe_lock, flags);
+}
+
+static void hss_hdlc_rx_irq(void *pdev)
+{
+	struct net_device *dev = pdev;
+	struct port *port = dev_to_port(dev);
+
+#if DEBUG_RX
+	printk(KERN_DEBUG "%s: hss_hdlc_rx_irq\n", dev->name);
+#endif
+	qmgr_disable_irq(queue_ids[port->id].rx);
+	netif_rx_schedule(dev, &port->napi);
+}
+
+static int hss_hdlc_poll(struct napi_struct *napi, int budget)
+{
+	struct port *port = container_of(napi, struct port, napi);
+	struct net_device *dev = port->netdev;
+	unsigned int rxq = queue_ids[port->id].rx;
+	unsigned int rxfreeq = queue_ids[port->id].rxfree;
+	struct net_device_stats *stats = hdlc_stats(dev);
+	int received = 0;
+
+#if DEBUG_RX
+	printk(KERN_DEBUG "%s: hss_hdlc_poll\n", dev->name);
+#endif
+
+	while (received < budget) {
+		struct sk_buff *skb;
+		struct desc *desc;
+		int n;
+#ifdef __ARMEB__
+		struct sk_buff *temp;
+		u32 phys;
+#endif
+
+		if ((n = queue_get_desc(rxq, port, 0)) < 0) {
+			received = 0; /* No packet received */
+#if DEBUG_RX
+			printk(KERN_DEBUG "%s: hss_hdlc_poll"
+			       " netif_rx_complete\n", dev->name);
+#endif
+			netif_rx_complete(dev, napi);
+			qmgr_enable_irq(rxq);
+			if (!qmgr_stat_empty(rxq) &&
+			    netif_rx_reschedule(dev, napi)) {
+#if DEBUG_RX
+				printk(KERN_DEBUG "%s: hss_hdlc_poll"
+				       " netif_rx_reschedule succeeded\n",
+				       dev->name);
+#endif
+				qmgr_disable_irq(rxq);
+				continue;
+			}
+#if DEBUG_RX
+			printk(KERN_DEBUG "%s: hss_hdlc_poll all done\n",
+			       dev->name);
+#endif
+			return 0; /* all work done */
+		}
+
+		desc = rx_desc_ptr(port, n);
+#if 0 /* FIXME - error_count counts modulo 256, perhaps we should use it */
+		if (desc->error_count)
+			printk(KERN_DEBUG "%s: hss_hdlc_poll status 0x%02X"
+			       " errors %u\n", dev->name, desc->status,
+			       desc->error_count);
+#endif
+		skb = NULL;
+		switch (desc->status) {
+		case 0:
+#ifdef __ARMEB__
+			if ((skb = netdev_alloc_skb(dev, RX_SIZE)) != NULL) {
+				phys = dma_map_single(&dev->dev, skb->data,
+						      RX_SIZE,
+						      DMA_FROM_DEVICE);
+				if (dma_mapping_error(phys)) {
+					dev_kfree_skb(skb);
+					skb = NULL;
+				}
+			}
+#else
+			skb = netdev_alloc_skb(dev, desc->pkt_len);
+#endif
+			if (!skb)
+				stats->rx_dropped++;
+			break;
+		case ERR_HDLC_ALIGN:
+		case ERR_HDLC_ABORT:
+			stats->rx_frame_errors++;
+			stats->rx_errors++;
+			break;
+		case ERR_HDLC_FCS:
+			stats->rx_crc_errors++;
+			stats->rx_errors++;
+			break;
+		case ERR_HDLC_TOO_LONG:
+			stats->rx_length_errors++;
+			stats->rx_errors++;
+			break;
+		default:	/* FIXME - remove printk */
+			printk(KERN_ERR "%s: hss_hdlc_poll: status 0x%02X"
+			       " errors %u\n", dev->name, desc->status,
+			       desc->error_count);
+			stats->rx_errors++;
+		}
+
+		if (!skb) {
+			/* put the desc back on RX-ready queue */
+			desc->buf_len = RX_SIZE;
+			desc->pkt_len = desc->status = 0;
+			queue_put_desc(rxfreeq, rx_desc_phys(port, n), desc);
+			continue;
+		}
+
+		/* process received frame */
+#ifdef __ARMEB__
+		temp = skb;
+		skb = port->rx_buff_tab[n];
+		dma_unmap_single(&dev->dev, desc->data,
+				 RX_SIZE, DMA_FROM_DEVICE);
+#else
+		dma_sync_single(&dev->dev, desc->data,
+				RX_SIZE, DMA_FROM_DEVICE);
+		memcpy_swab32((u32 *)skb->data, (u32 *)port->rx_buff_tab[n],
+			      ALIGN(desc->pkt_len, 4) / 4);
+#endif
+		skb_put(skb, desc->pkt_len);
+
+		debug_pkt(dev, "hss_hdlc_poll", skb->data, skb->len);
+
+		skb->protocol = hdlc_type_trans(skb, dev);
+		dev->last_rx = jiffies;
+		stats->rx_packets++;
+		stats->rx_bytes += skb->len;
+		netif_receive_skb(skb);
+
+		/* put the new buffer on RX-free queue */
+#ifdef __ARMEB__
+		port->rx_buff_tab[n] = temp;
+		desc->data = phys;
+#endif
+		desc->buf_len = RX_SIZE;
+		desc->pkt_len = 0;
+		queue_put_desc(rxfreeq, rx_desc_phys(port, n), desc);
+		received++;
+	}
+#if DEBUG_RX
+	printk(KERN_DEBUG "hss_hdlc_poll: end, not all work done\n");
+#endif
+	return received;	/* not all work done */
+}
+
+
+static void hss_hdlc_txdone_irq(void *pdev)
+{
+	struct net_device *dev = pdev;
+	struct port *port = dev_to_port(dev);
+	struct net_device_stats *stats = hdlc_stats(dev);
+	int n_desc;
+
+#if DEBUG_TX
+	printk(KERN_DEBUG DRV_NAME ": hss_hdlc_txdone_irq\n");
+#endif
+	while ((n_desc = queue_get_desc(queue_ids[port->id].txdone,
+					port, 1)) >= 0) {
+		struct desc *desc;
+		int start;
+
+		desc = tx_desc_ptr(port, n_desc);
+
+		stats->tx_packets++;
+		stats->tx_bytes += desc->pkt_len;
+
+		dma_unmap_tx(port, desc);
+#if DEBUG_TX
+		printk(KERN_DEBUG "%s: hss_hdlc_txdone_irq free %p\n",
+		       dev->name, port->tx_buff_tab[n_desc]);
+#endif
+		free_buffer_irq(port->tx_buff_tab[n_desc]);
+		port->tx_buff_tab[n_desc] = NULL;
+
+		start = qmgr_stat_empty(port->plat->txreadyq);
+		queue_put_desc(port->plat->txreadyq,
+			       tx_desc_phys(port, n_desc), desc);
+		if (start) {
+#if DEBUG_TX
+			printk(KERN_DEBUG "%s: hss_hdlc_txdone_irq xmit"
+			       " ready\n", dev->name);
+#endif
+			netif_wake_queue(dev);
+		}
+	}
+}
+
+static int hss_hdlc_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct port *port = dev_to_port(dev);
+	struct net_device_stats *stats = hdlc_stats(dev);
+	unsigned int txreadyq = port->plat->txreadyq;
+	int len, offset, bytes, n;
+	void *mem;
+	u32 phys;
+	struct desc *desc;
+
+#if DEBUG_TX
+	printk(KERN_DEBUG "%s: hss_hdlc_xmit\n", dev->name);
+#endif
+
+	if (unlikely(skb->len > HDLC_MAX_MRU)) {
+		dev_kfree_skb(skb);
+		stats->tx_errors++;
+		return NETDEV_TX_OK;
+	}
+
+	debug_pkt(dev, "hss_hdlc_xmit", skb->data, skb->len);
+
+	len = skb->len;
+#ifdef __ARMEB__
+	offset = 0; /* no need to keep alignment */
+	bytes = len;
+	mem = skb->data;
+#else
+	offset = (int)skb->data & 3; /* keep 32-bit alignment */
+	bytes = ALIGN(offset + len, 4);
+	if (!(mem = kmalloc(bytes, GFP_ATOMIC))) {
+		dev_kfree_skb(skb);
+		stats->tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+	memcpy_swab32(mem, (u32 *)((int)skb->data & ~3), bytes / 4);
+	dev_kfree_skb(skb);
+#endif
+
+	phys = dma_map_single(&dev->dev, mem, bytes, DMA_TO_DEVICE);
+	if (dma_mapping_error(phys)) {
+#ifdef __ARMEB__
+		dev_kfree_skb(skb);
+#else
+		kfree(mem);
+#endif
+		stats->tx_dropped++;
+		return NETDEV_TX_OK;
+	}
+
+	n = queue_get_desc(txreadyq, port, 1);
+	BUG_ON(n < 0);
+	desc = tx_desc_ptr(port, n);
+
+#ifdef __ARMEB__
+	port->tx_buff_tab[n] = skb;
+#else
+	port->tx_buff_tab[n] = mem;
+#endif
+	desc->data = phys + offset;
+	desc->buf_len = desc->pkt_len = len;
+
+	wmb();
+	queue_put_desc(queue_ids[port->id].tx, tx_desc_phys(port, n), desc);
+	dev->trans_start = jiffies;
+
+	if (qmgr_stat_empty(txreadyq)) {
+#if DEBUG_TX
+		printk(KERN_DEBUG "%s: hss_hdlc_xmit queue full\n", dev->name);
+#endif
+		netif_stop_queue(dev);
+		/* we could miss TX ready interrupt */
+		if (!qmgr_stat_empty(txreadyq)) {
+#if DEBUG_TX
+			printk(KERN_DEBUG "%s: hss_hdlc_xmit ready again\n",
+			       dev->name);
+#endif
+			netif_wake_queue(dev);
+		}
+	}
+
+#if DEBUG_TX
+	printk(KERN_DEBUG "%s: hss_hdlc_xmit end\n", dev->name);
+#endif
+	return NETDEV_TX_OK;
+}
+
+
+static int request_hdlc_queues(struct port *port)
+{
+	int err;
+
+	err = qmgr_request_queue(queue_ids[port->id].rxfree, RX_DESCS, 0, 0);
+	if (err)
+		return err;
+
+	err = qmgr_request_queue(queue_ids[port->id].rx, RX_DESCS, 0, 0);
+	if (err)
+		goto rel_rxfree;
+
+	err = qmgr_request_queue(queue_ids[port->id].tx, TX_DESCS, 0, 0);
+	if (err)
+		goto rel_rx;
+
+	err = qmgr_request_queue(port->plat->txreadyq, TX_DESCS, 0, 0);
+	if (err)
+		goto rel_tx;
+
+	err = qmgr_request_queue(queue_ids[port->id].txdone, TX_DESCS, 0, 0);
+	if (err)
+		goto rel_txready;
+	return 0;
+
+rel_txready:
+	qmgr_release_queue(port->plat->txreadyq);
+rel_tx:
+	qmgr_release_queue(queue_ids[port->id].tx);
+rel_rx:
+	qmgr_release_queue(queue_ids[port->id].rx);
+rel_rxfree:
+	qmgr_release_queue(queue_ids[port->id].rxfree);
+	printk(KERN_DEBUG "%s: unable to request hardware queues\n",
+	       port->netdev->name);
+	return err;
+}
+
+static void release_hdlc_queues(struct port *port)
+{
+	qmgr_release_queue(queue_ids[port->id].rxfree);
+	qmgr_release_queue(queue_ids[port->id].rx);
+	qmgr_release_queue(queue_ids[port->id].txdone);
+	qmgr_release_queue(queue_ids[port->id].tx);
+	qmgr_release_queue(port->plat->txreadyq);
+}
+
+static int init_hdlc_queues(struct port *port)
+{
+	int i;
+
+	if (!ports_open)
+		if (!(dma_pool = dma_pool_create(DRV_NAME, NULL,
+						 POOL_ALLOC_SIZE, 32, 0)))
+			return -ENOMEM;
+
+	if (!(port->desc_tab = dma_pool_alloc(dma_pool, GFP_KERNEL,
+					      &port->desc_tab_phys)))
+		return -ENOMEM;
+	memset(port->desc_tab, 0, POOL_ALLOC_SIZE);
+	memset(port->rx_buff_tab, 0, sizeof(port->rx_buff_tab)); /* tables */
+	memset(port->tx_buff_tab, 0, sizeof(port->tx_buff_tab));
+
+	/* Setup RX buffers */
+	for (i = 0; i < RX_DESCS; i++) {
+		struct desc *desc = rx_desc_ptr(port, i);
+		buffer_t *buff;
+		void *data;
+#ifdef __ARMEB__
+		if (!(buff = netdev_alloc_skb(port->netdev, RX_SIZE)))
+			return -ENOMEM;
+		data = buff->data;
+#else
+		if (!(buff = kmalloc(RX_SIZE, GFP_KERNEL)))
+			return -ENOMEM;
+		data = buff;
+#endif
+		desc->buf_len = RX_SIZE;
+		desc->data = dma_map_single(&port->netdev->dev, data,
+					    RX_SIZE, DMA_FROM_DEVICE);
+		if (dma_mapping_error(desc->data)) {
+			free_buffer(buff);
+			return -EIO;
+		}
+		port->rx_buff_tab[i] = buff;
+	}
+
+	return 0;
+}
+
+static void destroy_hdlc_queues(struct port *port)
+{
+	int i;
+
+	if (port->desc_tab) {
+		for (i = 0; i < RX_DESCS; i++) {
+			struct desc *desc = rx_desc_ptr(port, i);
+			buffer_t *buff = port->rx_buff_tab[i];
+			if (buff) {
+				dma_unmap_single(&port->netdev->dev,
+						 desc->data, RX_SIZE,
+						 DMA_FROM_DEVICE);
+				free_buffer(buff);
+			}
+		}
+		for (i = 0; i < TX_DESCS; i++) {
+			struct desc *desc = tx_desc_ptr(port, i);
+			buffer_t *buff = port->tx_buff_tab[i];
+			if (buff) {
+				dma_unmap_tx(port, desc);
+				free_buffer(buff);
+			}
+		}
+		dma_pool_free(dma_pool, port->desc_tab, port->desc_tab_phys);
+		port->desc_tab = NULL;
+	}
+
+	if (!ports_open && dma_pool) {
+		dma_pool_destroy(dma_pool);
+		dma_pool = NULL;
+	}
+}
+
+static int hss_hdlc_open(struct net_device *dev)
+{
+	struct port *port = dev_to_port(dev);
+	unsigned long flags;
+	int i, err = 0;
+
+	if ((err = hdlc_open(dev)))
+		return err;
+
+	if ((err = request_hdlc_queues(port)))
+		goto err_hdlc_close;
+
+	if ((err = init_hdlc_queues(port)))
+		goto err_destroy_queues;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	if (port->mode == MODE_G704 && port->channels[0] == CHANNEL_HDLC) {
+		err = -EBUSY; /* channel #0 is used for G.704 framing */
+		goto err_unlock;
+	}
+	if (port->mode != MODE_HDLC)
+		for (i = port->frame_size / 8; i < MAX_CHANNELS; i++)
+			if (port->channels[i] == CHANNEL_HDLC) {
+				err = -ECHRNG; /* frame too short */
+				goto err_unlock;
+			}
+
+	if ((err = hss_config_load_firmware(port)))
+		goto err_unlock;
+
+	if (!port->chan_open_count && port->plat->open)
+		if ((err = port->plat->open(port->id, dev,
+					    hss_hdlc_set_carrier)))
+			goto err_unlock;
+
+	if (port->mode == MODE_G704 && !port->chan_open_count)
+		if ((err = hss_prepare_chan(port)))
+			goto err_plat_close;
+
+	spin_unlock_irqrestore(&npe_lock, flags);
+
+	/* Populate queues with buffers, no failure after this point */
+	for (i = 0; i < TX_DESCS; i++)
+		queue_put_desc(port->plat->txreadyq,
+			       tx_desc_phys(port, i), tx_desc_ptr(port, i));
+
+	for (i = 0; i < RX_DESCS; i++)
+		queue_put_desc(queue_ids[port->id].rxfree,
+			       rx_desc_phys(port, i), rx_desc_ptr(port, i));
+
+	napi_enable(&port->napi);
+	netif_start_queue(dev);
+
+	qmgr_set_irq(queue_ids[port->id].rx, QUEUE_IRQ_SRC_NOT_EMPTY,
+		     hss_hdlc_rx_irq, dev);
+
+	qmgr_set_irq(queue_ids[port->id].txdone, QUEUE_IRQ_SRC_NOT_EMPTY,
+		     hss_hdlc_txdone_irq, dev);
+	qmgr_enable_irq(queue_ids[port->id].txdone);
+
+	ports_open++;
+	port->hdlc_open = 1;
+
+	hss_config_set_hdlc_cfg(port);
+	hss_config_set_lut(port);
+	hss_config_load(port);
+
+	if (port->mode == MODE_G704 && !port->chan_open_count)
+		hss_config_start_chan(port);
+
+	hss_config_start_hdlc(port);
+
+	/* we may already have RX data, enables IRQ */
+	netif_rx_schedule(dev, &port->napi);
+	return 0;
+
+err_plat_close:
+	if (!port->chan_open_count && port->plat->close)
+		port->plat->close(port->id, dev);
+err_unlock:
+	spin_unlock_irqrestore(&npe_lock, flags);
+err_destroy_queues:
+	destroy_hdlc_queues(port);
+	release_hdlc_queues(port);
+err_hdlc_close:
+	hdlc_close(dev);
+	return err;
+}
+
+static int hss_hdlc_close(struct net_device *dev)
+{
+	struct port *port = dev_to_port(dev);
+	unsigned long flags;
+	int i, buffs = RX_DESCS; /* allocated RX buffers */
+
+	spin_lock_irqsave(&npe_lock, flags);
+	ports_open--;
+	port->hdlc_open = 0;
+	qmgr_disable_irq(queue_ids[port->id].rx);
+	netif_stop_queue(dev);
+	napi_disable(&port->napi);
+
+	hss_config_stop_hdlc(port);
+
+	if (port->mode == MODE_G704 && !port->chan_open_count)
+		hss_chan_stop(port);
+
+	while (queue_get_desc(queue_ids[port->id].rxfree, port, 0) >= 0)
+		buffs--;
+	while (queue_get_desc(queue_ids[port->id].rx, port, 0) >= 0)
+		buffs--;
+
+	if (buffs)
+		printk(KERN_CRIT "%s: unable to drain RX queue, %i buffer(s)"
+		       " left in NPE\n", dev->name, buffs);
+
+	buffs = TX_DESCS;
+	while (queue_get_desc(queue_ids[port->id].tx, port, 1) >= 0)
+		buffs--; /* cancel TX */
+
+	i = 0;
+	do {
+		while (queue_get_desc(port->plat->txreadyq, port, 1) >= 0)
+			buffs--;
+		if (!buffs)
+			break;
+	} while (++i < MAX_CLOSE_WAIT);
+
+	if (buffs)
+		printk(KERN_CRIT "%s: unable to drain TX queue, %i buffer(s) "
+		       "left in NPE\n", dev->name, buffs);
+#if DEBUG_CLOSE
+	if (!buffs)
+		printk(KERN_DEBUG "Draining TX queues took %i cycles\n", i);
+#endif
+	qmgr_disable_irq(queue_ids[port->id].txdone);
+
+	if (!port->chan_open_count && port->plat->close)
+		port->plat->close(port->id, dev);
+	spin_unlock_irqrestore(&npe_lock, flags);
+
+	destroy_hdlc_queues(port);
+	release_hdlc_queues(port);
+	hdlc_close(dev);
+	return 0;
+}
+
+
+static int hss_hdlc_attach(struct net_device *dev, unsigned short encoding,
+			   unsigned short parity)
+{
+	struct port *port = dev_to_port(dev);
+
+	if (encoding != ENCODING_NRZ)
+		return -EINVAL;
+
+	switch(parity) {
+	case PARITY_CRC16_PR1_CCITT:
+		port->hdlc_cfg = 0;
+		return 0;
+
+	case PARITY_CRC32_PR1_CCITT:
+		port->hdlc_cfg = PKT_HDLC_CRC_32;
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+
+static int hss_hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	const size_t size = sizeof(sync_serial_settings);
+	sync_serial_settings new_line;
+	sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
+	struct port *port = dev_to_port(dev);
+	unsigned long flags;
+	int i, clk;
+
+	if (cmd != SIOCWANDEV)
+		return hdlc_ioctl(dev, ifr, cmd);
+
+	switch(ifr->ifr_settings.type) {
+	case IF_GET_IFACE:
+		ifr->ifr_settings.type = IF_IFACE_V35;
+		if (ifr->ifr_settings.size < size) {
+			ifr->ifr_settings.size = size; /* data size wanted */
+			return -ENOBUFS;
+		}
+		memset(&new_line, 0, sizeof(new_line));
+		new_line.clock_type = port->clock_type;
+		new_line.clock_rate = port->clock_rate;
+		new_line.loopback = port->loopback;
+		if (copy_to_user(line, &new_line, size))
+			return -EFAULT;
+
+		if (!port->chan_buf)
+			return 0;
+
+		dma_sync_single(&dev->dev, port->chan_rx_buf_phys,
+				chan_rx_buf_len(port), DMA_FROM_DEVICE);
+		printk(KERN_DEBUG "RX:\n");
+		for (i = 0; i < chan_rx_buf_len(port); i++) {
+			if (i % 32 == 0)
+				printk(KERN_DEBUG "%03X ", i);
+			printk("%02X%c", chan_rx_buf(port)[i],
+			       (i + 1) % 32 ? ' ' : '\n');
+		}
+
+#if 0
+		printk(KERN_DEBUG "TX:\n");
+		for (i = 0; i < /*CHAN_TX_FRAMES * 2*/ chan_tx_buf_len(port)
+			     + chan_tx_lists_len(port); i++) {
+			if (i % 32 == 0)
+				printk(KERN_DEBUG "%03X ", i);
+			printk("%02X%c", chan_tx_buf(port)[i],
+			       (i + 1) % 32 ? ' ' : '\n');
+		}
+#endif
+		port->msg_count = 10;
+		return 0;
+
+	case IF_IFACE_SYNC_SERIAL:
+	case IF_IFACE_V35:
+		if(!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		if (copy_from_user(&new_line, line, size))
+			return -EFAULT;
+
+		clk = new_line.clock_type;
+		if (port->plat->set_clock)
+			clk = port->plat->set_clock(port->id, clk);
+
+		if (clk != CLOCK_EXT && clk != CLOCK_INT)
+			return -EINVAL;	/* No such clock setting */
+
+		if (new_line.loopback != 0 && new_line.loopback != 1)
+			return -EINVAL;
+
+		port->clock_type = clk; /* Update settings */
+		/* FIXME port->clock_rate = new_line.clock_rate */;
+		port->loopback = new_line.loopback;
+
+		spin_lock_irqsave(&npe_lock, flags);
+
+		if (port->chan_open_count || port->hdlc_open) {
+			hss_config_set_line(port);
+			hss_config_load(port);
+		}
+		if (port->loopback || port->carrier)
+			netif_carrier_on(port->netdev);
+		else
+			netif_carrier_off(port->netdev);
+		spin_unlock_irqrestore(&npe_lock, flags);
+
+		return 0;
+
+	default:
+		return hdlc_ioctl(dev, ifr, cmd);
+	}
+}
+
+/*****************************************************************************
+ * channelized (G.704) operation
+ ****************************************************************************/
+
+static void g704_rx_framer(struct port *port, unsigned int offset)
+{
+	u8 *data = chan_rx_buf(port) + sub_offset(offset, CHAN_RX_TRIGGER,
+						  CHAN_RX_FRAMES);
+	unsigned int bit, frame, bad_even = 0, bad_odd = 0, cnt;
+	unsigned int is_first = port->just_set_offset;
+	u8 zeros_even, zeros_odd, ones_even, ones_odd;
+	enum alignment aligned;
+
+	port->just_set_offset = 0;
+	dma_sync_single(port->dev, port->chan_rx_buf_phys, CHAN_RX_FRAMES,
+			DMA_FROM_DEVICE);
+
+	/* check if aligned first */
+	for (frame = 0; frame < CHAN_RX_TRIGGER &&
+		     (bad_even <= MAX_CHAN_RX_BAD_SYNC ||
+		      bad_odd <= MAX_CHAN_RX_BAD_SYNC); frame += 2) {
+		u8 ve = data[frame];
+		u8 vo = data[frame + 1];
+
+		if ((ve & 0x7F) != 0x1B || !(vo & 0x40))
+			bad_even++;
+
+		if ((vo & 0x7F) != 0x1B || !(ve & 0x40))
+			bad_odd++;
+	}
+
+	if (bad_even <= MAX_CHAN_RX_BAD_SYNC)
+		aligned = EVEN_FIRST;
+	else if (bad_odd <= MAX_CHAN_RX_BAD_SYNC)
+		aligned = ODD_FIRST;
+	else
+		aligned = NOT_ALIGNED;
+
+	if (aligned != NOT_ALIGNED) {
+		if (aligned == port->aligned)
+			return; /* no change */
+		if (printk_ratelimit())
+			printk(KERN_INFO "HSS-%i: synchronized at %u (%s frame"
+			       " first)\n", port->id, port->frame_sync_offset,
+			       aligned == EVEN_FIRST ? "even" : "odd");
+		port->aligned = aligned;
+
+		atomic_inc(&port->chan_tx_irq_number);
+		wake_up_interruptible(&port->chan_tx_waitq);
+		atomic_inc(&port->chan_rx_irq_number);
+		wake_up_interruptible(&port->chan_rx_waitq);
+		return;
+	}
+
+	/* not aligned */
+	if (port->aligned != NOT_ALIGNED && printk_ratelimit()) {
+		printk(KERN_INFO "HSS-%i: lost alignment\n", port->id);
+		port->aligned = NOT_ALIGNED;
+#if DEBUG_FRAMER
+		for (cnt = 0; cnt < CHAN_RX_FRAMES; cnt++)
+			printk("%c%02X%s", cnt == offset ? '>' : ' ',
+			       chan_rx_buf(port)[cnt],
+			       (cnt + 1) % 32 ? "" : "\n");
+#endif
+
+		for (cnt = 0; cnt < MAX_CHAN_DEVICES; cnt++)
+			if (port->chan_devices[cnt]) {
+				set_bit(TX_ERROR_BIT, &port->chan_devices[cnt]
+					->errors_bitmap);
+				set_bit(RX_ERROR_BIT, &port->chan_devices[cnt]
+					->errors_bitmap);
+			}
+		atomic_inc(&port->chan_tx_irq_number);
+		wake_up_interruptible(&port->chan_tx_waitq);
+		atomic_inc(&port->chan_rx_irq_number);
+		wake_up_interruptible(&port->chan_rx_waitq);
+	}
+
+	if (is_first)
+		return;
+
+	zeros_even = zeros_odd = 0;
+	ones_even = ones_odd = 0xFF;
+	for (frame = 0; frame < CHAN_RX_TRIGGER; frame += 2) {
+		zeros_even |= data[frame];
+		zeros_odd |= data[frame + 1];
+		ones_even &= data[frame];
+		ones_odd &= data[frame + 1];
+	}
+
+	for (bit = 0; bit < 7; bit++) {
+		if ((zeros_even & ~0x9B) == 0 && (ones_even & 0x1B) == 0x1B &&
+		    (ones_odd & 0x40) == 0x40) {
+			aligned = EVEN_FIRST; /* maybe */
+			break;
+		}
+		if ((zeros_odd & ~0x9B) == 0 && (ones_odd & 0x1B) == 0x1B &&
+		    (ones_even & 0x40) == 0x40) {
+			aligned = ODD_FIRST; /* maybe */
+			break;
+		}
+		zeros_even <<= 1;
+		ones_even = ones_even << 1 | 1;
+		zeros_odd <<= 1;
+		ones_odd = ones_odd << 1 | 1;
+	}
+
+	port->frame_sync_offset += port->frame_size - bit;
+	port->frame_sync_offset %= port->frame_size;
+	port->just_set_offset = 1;
+
+#if DEBUG_FRAMER
+	if (bit == 7)
+		printk(KERN_DEBUG "HSS-%i: trying frame sync at %u\n",
+		       port->id, port->frame_sync_offset);
+	else
+		printk(KERN_DEBUG "HSS-%i: found possible frame sync pattern at"
+		       " %u (%s frame first)\n", port->id,
+		       port->frame_sync_offset,
+		       aligned == EVEN_FIRST ? "even" : "odd");
+#endif
+
+	hss_config_set_rx_frame(port);
+	hss_config_load(port);
+}
+
+static void chan_process_tx_irq(struct chan_device *chan_dev, int offset)
+{
+	/* in bytes */
+	unsigned int buff_len = CHAN_TX_FRAMES * chan_dev->chan_count;
+	unsigned int list_len = CHAN_TX_LIST_FRAMES * chan_dev->chan_count;
+	int eaten, last_offset = chan_dev->port->chan_last_tx * list_len;
+
+	offset *= list_len;
+	eaten = sub_offset(offset, last_offset, buff_len);
+
+	if (chan_dev->tx_count > eaten + 2 * list_len) {
+		/* two pages must be reserved for the transmitter */
+		chan_dev->tx_first += eaten;
+		chan_dev->tx_first %= buff_len;
+		chan_dev->tx_count -= eaten;
+	} else {
+		/* FIXME check
+		   0
+		   1 tx_first (may still be transmited)
+		   2 tx_offset (currently reported by the NPE)
+		   3 tx_first + 2 * list_len (free to write here)
+		   4
+		   5
+		*/
+
+		/* printk(KERN_DEBUG "TX buffer underflow\n"); */
+		chan_dev->tx_first = sub_offset(offset, list_len, buff_len);
+		chan_dev->tx_count = 2 * list_len; /* reserve */
+		set_bit(TX_ERROR_BIT, &chan_dev->errors_bitmap);
+	}
+}
+
+static void chan_process_rx_irq(struct chan_device *chan_dev, int offset)
+{
+	/* in bytes */
+	unsigned int buff_len = CHAN_RX_FRAMES * chan_dev->chan_count;
+	unsigned int trig_len = CHAN_RX_TRIGGER * chan_dev->chan_count;
+	int last_offset = chan_dev->port->chan_last_rx * chan_dev->chan_count;
+
+	offset *= chan_dev->chan_count;
+	chan_dev->rx_count += sub_offset(offset, last_offset + trig_len,
+					 buff_len) + trig_len;
+	if (chan_dev->rx_count > buff_len - 2 * trig_len) {
+		/* two pages - offset[0] and offset[1] are lost - FIXME check */
+		/* printk(KERN_DEBUG "RX buffer overflow\n"); */
+		chan_dev->rx_first = (offset + 2 * trig_len) % buff_len;
+		chan_dev->rx_count = buff_len - 2 * trig_len;
+		set_bit(RX_ERROR_BIT, &chan_dev->errors_bitmap);
+	}
+}
+
+static void hss_chan_irq(void *pdev)
+{
+	struct port *port = pdev;
+	u32 v;
+
+#if DEBUG_RX
+	printk(KERN_DEBUG DRV_NAME ": hss_chan_irq\n");
+#endif
+	spin_lock(&npe_lock);
+	while ((v = qmgr_get_entry(queue_ids[port->id].chan))) {
+		unsigned int first, errors, tx_list, rx_frame;
+		int i, bad;
+
+		first = v >> 24;
+		errors = (v >> 16) & 0xFF;
+		tx_list = (v >> 8) & 0xFF;
+		rx_frame = v & 0xFF;
+
+		if (port->msg_count) {
+			printk(KERN_DEBUG "chan_irq hss %i jiffies %lu first"
+			       " 0x%02X errors 0x%02X tx_list 0x%02X rx_frame"
+			       " 0x%02X\n", port->id, jiffies, first, errors,
+			       tx_list, rx_frame);
+			port->msg_count--;
+		}
+
+		BUG_ON(rx_frame % CHAN_RX_TRIGGER);
+		BUG_ON(rx_frame >= CHAN_RX_FRAMES);
+		BUG_ON(tx_list >= CHAN_TX_LISTS);
+
+		bad = port->mode == MODE_G704 && port->aligned == NOT_ALIGNED;
+		if (!bad && tx_list != port->chan_last_tx) {
+			if (tx_list != (port->chan_last_tx + 1) % CHAN_TX_LISTS)
+				printk(KERN_DEBUG "Skipped an IRQ? Tx last %i"
+				       " current %i\n", port->chan_last_tx,
+				       tx_list);
+			for (i = 0; i < MAX_CHAN_DEVICES; i++) {
+				if (!port->chan_devices[i] ||
+				    !port->chan_devices[i]->open_count)
+					continue;
+				chan_process_tx_irq(port->chan_devices[i],
+						    tx_list);
+			}
+			atomic_inc(&port->chan_tx_irq_number);
+#if 0
+			printk(KERN_DEBUG "wakeing up TX jiff %lu\n",
+			       jiffies, errors);
+#endif
+			wake_up_interruptible(&port->chan_tx_waitq);
+		}
+
+		if (rx_frame != (port->chan_last_rx + CHAN_RX_TRIGGER) %
+		    CHAN_RX_FRAMES)
+			printk(KERN_DEBUG "Skipped an IRQ? Rx last %i"
+			       " current %i\n", port->chan_last_rx, rx_frame);
+
+		if (port->mode == MODE_G704)
+			g704_rx_framer(port, rx_frame);
+
+		if (!bad &&
+		    (port->mode != MODE_G704 || port->aligned != NOT_ALIGNED)) {
+			for (i = 0; i < MAX_CHAN_DEVICES; i++) {
+				if (!port->chan_devices[i] ||
+				    !port->chan_devices[i]->open_count)
+					continue;
+				chan_process_rx_irq(port->chan_devices[i],
+						    rx_frame);
+			}
+			atomic_inc(&port->chan_rx_irq_number);
+			wake_up_interruptible(&port->chan_rx_waitq);
+		}
+		port->chan_last_tx = tx_list;
+		port->chan_last_rx = rx_frame;
+	}
+	spin_unlock(&npe_lock);
+}
+
+
+static int hss_prepare_chan(struct port *port)
+{
+	int err;
+
+	if ((err = hss_config_load_firmware(port)))
+		return err;
+
+	if ((err = qmgr_request_queue(queue_ids[port->id].chan,
+				      CHAN_QUEUE_LEN, 0, 0)))
+		return err;
+
+	if (!(port->chan_buf = kmalloc(chan_tx_buf_len(port) +
+				       chan_tx_lists_len(port) +
+				       chan_rx_buf_len(port), GFP_KERNEL))) {
+		goto release_queue;
+		err = -ENOBUFS;
+	}
+
+	port->chan_tx_buf_phys = dma_map_single(port->dev, chan_tx_buf(port),
+						chan_tx_buf_len(port) +
+						chan_tx_lists_len(port),
+						DMA_TO_DEVICE);
+	if (dma_mapping_error(port->chan_tx_buf_phys)) {
+		err = -EIO;
+		goto free;
+	}
+
+	port->chan_rx_buf_phys = dma_map_single(port->dev, chan_rx_buf(port),
+						chan_rx_buf_len(port),
+						DMA_FROM_DEVICE);
+	if (dma_mapping_error(port->chan_rx_buf_phys)) {
+		err = -EIO;
+		goto unmap_tx;
+	}
+
+	qmgr_set_irq(queue_ids[port->id].chan, QUEUE_IRQ_SRC_NOT_EMPTY,
+		     hss_chan_irq, port);
+	qmgr_enable_irq(queue_ids[port->id].chan);
+	hss_chan_irq(port);
+	return 0;
+
+unmap_tx:
+	dma_unmap_single(port->dev, port->chan_tx_buf_phys,
+			 chan_tx_buf_len(port) + chan_tx_lists_len(port),
+			 DMA_TO_DEVICE);
+free:
+	kfree(port->chan_buf);
+	port->chan_buf = NULL;
+release_queue:
+	qmgr_release_queue(queue_ids[port->id].chan);
+	return err;
+}
+
+void hss_chan_stop(struct port *port)
+{
+	if (!port->chan_open_count && !port->hdlc_open)
+		qmgr_disable_irq(queue_ids[port->id].chan);
+
+	hss_config_stop_chan(port);
+	hss_config_set_lut(port);
+	hss_config_load(port);
+
+	if (!port->chan_open_count && !port->hdlc_open) {
+		dma_unmap_single(port->dev, port->chan_tx_buf_phys,
+				 chan_tx_buf_len(port) +
+				 chan_tx_lists_len(port), DMA_TO_DEVICE);
+		dma_unmap_single(port->dev, port->chan_rx_buf_phys,
+				 chan_rx_buf_len(port), DMA_FROM_DEVICE);
+		kfree(port->chan_buf);
+		port->chan_buf = NULL;
+		qmgr_release_queue(queue_ids[port->id].chan);
+	}
+}
+
+static int hss_chan_open(struct inode *inode, struct file *file)
+{
+	struct chan_device *chan_dev = inode_to_chan_dev(inode);
+	struct port *port = chan_dev->port;
+	unsigned long flags;
+	int i, err = 0;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	if (chan_dev->open_count) {
+		if (chan_dev->excl_open || (file->f_flags & O_EXCL))
+			err = -EBUSY;
+		else
+			chan_dev->open_count++;
+		goto out;
+	}
+
+	if (port->mode == MODE_HDLC) {
+		err = -ENOSYS;
+		goto out;
+	}
+
+	if (port->mode == MODE_G704 && port->channels[0] == chan_dev->id) {
+		err = -EBUSY; /* channel #0 is used for G.704 signaling */
+		goto out;
+	}
+	for (i = MAX_CHANNELS; i > port->frame_size / 8; i--)
+		if (port->channels[i - 1] == chan_dev->id) {
+			err = -ECHRNG; /* frame too short */
+			goto out;
+		}
+
+	chan_dev->rx_first = chan_dev->tx_first = 0;
+	chan_dev->rx_count = chan_dev->tx_count = 0;
+	clear_bit(TX_ERROR_BIT, &chan_dev->errors_bitmap);
+	clear_bit(RX_ERROR_BIT, &chan_dev->errors_bitmap);
+
+	if (!port->chan_open_count && !port->hdlc_open) {
+		if (port->plat->open)
+			if ((err = port->plat->open(port->id, port->netdev,
+						    hss_hdlc_set_carrier)))
+				goto out;
+		if ((err = hss_prepare_chan(port))) {
+			if (port->plat->close)
+				port->plat->close(port->id, port->netdev);
+			goto out;
+		}
+	}
+
+	hss_config_stop_chan(port);
+	chan_dev->open_count++;
+	port->chan_open_count++;
+	chan_dev->excl_open = !!file->f_flags & O_EXCL;
+
+	hss_config_set_lut(port);
+	hss_config_load(port);
+	hss_config_start_chan(port);
+out:
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return err;
+}
+
+static int hss_chan_release(struct inode *inode, struct file *file)
+{
+	struct chan_device *chan_dev = inode_to_chan_dev(inode);
+	struct port *port = chan_dev->port;
+	unsigned long flags;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	if (!--chan_dev->open_count) {
+		if (!--port->chan_open_count && !port->hdlc_open) {
+			hss_chan_stop(port);
+			if (port->plat->close)
+				port->plat->close(port->id, port->netdev);
+		} else {
+			hss_config_stop_chan(port);
+			hss_config_set_lut(port);
+			hss_config_set_line(port); //
+			hss_config_start_chan(port);
+		}
+	}
+
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return 0;
+}
+
+static ssize_t hss_chan_read(struct file *file, char __user *buf, size_t count,
+			     loff_t *f_pos)
+{
+	struct chan_device *chan_dev = inode_to_chan_dev
+		(file->f_path.dentry->d_inode);
+	struct port *port = chan_dev->port;
+	unsigned long flags;
+	u8 *rx_buf;
+	int res = 0, loops = 0;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	while (1) {
+		int prev_irq = atomic_read(&port->chan_rx_irq_number);
+#if 0
+		if (test_and_clear_bit(RX_ERROR_BIT, &chan_dev->errors_bitmap)
+		    || (port->mode == G704 && port->aligned == NOT_ALIGNED)) {
+			res = -EIO;
+			goto out;
+		}
+#endif
+		if (count == 0)
+			goto out;	/* no need to wait */
+
+		if (chan_dev->rx_count)
+			break;
+
+		spin_unlock_irqrestore(&npe_lock, flags);
+		loops++;
+		if ((res = wait_event_interruptible
+		     (port->chan_rx_waitq,
+		      atomic_read(&port->chan_rx_irq_number) != prev_irq)))
+			goto out;
+		spin_lock_irqsave(&npe_lock, flags);
+		continue;
+	}
+
+	dma_sync_single(port->dev, port->chan_rx_buf_phys,
+			chan_rx_buf_len(port), DMA_FROM_DEVICE);
+
+#if 0
+	if (loops > 1)
+		printk(KERN_DEBUG "ENTRY rx_first %u rx_count %u count %i"
+		       " last_rx %u loops %i\n", chan_dev->rx_first,
+		       chan_dev->rx_count, count, port->chan_last_rx, loops);
+#endif
+	rx_buf = chan_rx_buf(port);
+	while (chan_dev->rx_count > 0 && res < count) {
+		unsigned int chan = chan_dev->rx_first % chan_dev->chan_count;
+		unsigned int frame = chan_dev->rx_first / chan_dev->chan_count;
+
+		chan = chan_dev->log_channels[chan];
+		if (put_user(rx_buf[chan * CHAN_RX_FRAMES + frame], buf++)) {
+			res = -EFAULT;
+			goto out;
+		}
+		chan_dev->rx_first++;
+		chan_dev->rx_first %= CHAN_RX_FRAMES * chan_dev->chan_count;
+		chan_dev->rx_count--;
+		res++;
+	}
+out:
+#if 0
+	printk(KERN_DEBUG "EXIT  rx_first %u rx_count %u res %i\n",
+	       chan_dev->rx_first, chan_dev->rx_count, res);
+#endif
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return res;
+}
+
+static ssize_t hss_chan_write(struct file *file, const char __user *buf,
+			      size_t count, loff_t *f_pos)
+{
+	struct chan_device *chan_dev = inode_to_chan_dev
+		(file->f_path.dentry->d_inode);
+	struct port *port = chan_dev->port;
+	unsigned long flags;
+	u8 *tx_buf;
+	int res = 0, loops = 0;
+
+	spin_lock_irqsave(&npe_lock, flags);
+	while (1) {
+		int prev_irq = atomic_read(&port->chan_tx_irq_number);
+#if 0
+		if (test_and_clear_bit(TX_ERROR_BIT, &chan_dev->errors_bitmap)
+		    || (port->mode == G704 && port->aligned == NOT_ALIGNED)) {
+			res = -EIO;
+			goto out;
+		}
+#endif
+		if (count == 0)
+			goto out;	/* no need to wait */
+		
+		if (chan_dev->tx_count < CHAN_TX_FRAMES * chan_dev->chan_count)
+			break;
+
+		spin_unlock_irqrestore(&npe_lock, flags);
+		loops++;
+		if ((res = wait_event_interruptible
+		     (port->chan_tx_waitq,
+		      atomic_read (&port->chan_tx_irq_number) != prev_irq)))
+			goto out;
+		spin_lock_irqsave(&npe_lock, flags);
+		continue;
+	}
+
+#if 0
+	if (loops > 1)
+		printk(KERN_DEBUG "ENTRY TX_first %u tx_count %u count %i"
+		       " last_tx %u loops %i\n", chan_dev->tx_first,
+		       chan_dev->tx_count, count, port->chan_last_tx, loops);
+#endif
+	tx_buf = chan_tx_buf(port);
+	while (chan_dev->tx_count < CHAN_TX_FRAMES * chan_dev->chan_count &&
+	       res < count) {
+		unsigned int tail, chan, frame;
+
+		tail = (chan_dev->tx_first + chan_dev->tx_count) %
+			(CHAN_TX_FRAMES * chan_dev->chan_count);
+		chan = tail % chan_dev->chan_count;
+		frame = tail / chan_dev->chan_count;
+		chan = chan_dev->log_channels[chan];
+
+		if (get_user(tx_buf[chan * CHAN_TX_FRAMES + frame], buf++)) {
+			printk(KERN_DEBUG "BUG? TX %u %u %u\n",
+			       tail, chan, frame);
+			res = -EFAULT;
+			goto out_sync;
+		}
+		chan_dev->tx_count++;
+		res++;
+	}
+out_sync:
+	dma_sync_single(port->dev, port->chan_tx_buf_phys,
+			chan_tx_buf_len(port), DMA_TO_DEVICE);
+out:
+#if 0
+	printk(KERN_DEBUG "EXIT  TX_first %u tx_count %u res %i\n",
+	       chan_dev->tx_first, chan_dev->tx_count, res);
+#endif
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return res;
+}
+
+
+static unsigned int hss_chan_poll(struct file *file, poll_table *wait)
+{
+	struct chan_device *chan_dev = inode_to_chan_dev
+		(file->f_path.dentry->d_inode);
+	struct port *port = chan_dev->port;
+	unsigned long flags;
+	unsigned int mask = 0;
+
+	spin_lock_irqsave(&npe_lock, flags);
+	poll_wait(file, &port->chan_tx_waitq, wait);
+	poll_wait(file, &port->chan_rx_waitq, wait);
+
+	if (chan_dev->tx_count < CHAN_TX_FRAMES * chan_dev->chan_count)
+		mask |= POLLOUT | POLLWRNORM;
+	if (chan_dev->rx_count)
+		mask |= POLLIN | POLLRDNORM;
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return mask;
+}
+
+/*****************************************************************************
+ * channelized device sysfs attributes
+ ****************************************************************************/
+
+static ssize_t chan_show_chan(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct chan_device *chan_dev = dev_get_drvdata(dev);
+
+	return print_channels(chan_dev->port, buf, chan_dev->id);
+}
+
+static ssize_t chan_set_chan(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct chan_device *chan_dev = dev_get_drvdata(dev);
+	struct port *port = chan_dev->port;
+	unsigned long flags;
+	unsigned int ch;
+	size_t orig_len = len;
+	int err;
+
+	if (len && buf[len - 1] == '\n')
+		len--;
+
+	if (len != 7 || memcmp(buf, "destroy", 7))
+		return -EINVAL;
+
+	spin_lock_irqsave(&npe_lock, flags);
+	cdev_del(&chan_dev->cdev);
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++)
+		if (port->channels[ch] == chan_dev->id)
+			port->channels[ch] = CHANNEL_UNUSED;
+	port->chan_devices[chan_dev->id] = NULL;
+	kfree(chan_dev);
+	spin_unlock_irqrestore(&npe_lock, flags);
+
+	if ((err = device_schedule_callback(dev, device_unregister)))
+		return err;
+	return orig_len;
+}
+
+static struct device_attribute chan_attr =
+	__ATTR(channels, 0644, chan_show_chan, chan_set_chan);
+
+/*****************************************************************************
+ * main sysfs attributes
+ ****************************************************************************/
+
+static const struct file_operations chan_fops = {
+	.owner   = THIS_MODULE,
+	.llseek  = no_llseek,
+	.read    = hss_chan_read,
+	.write   = hss_chan_write,
+	.poll    = hss_chan_poll,
+	.open    = hss_chan_open,
+	.release = hss_chan_release,
+};
+
+static ssize_t create_chan(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t len)
+{
+	struct port *port = dev_get_drvdata(dev);
+	struct chan_device *chan_dev;
+	u8 channels[MAX_CHANNELS];
+	size_t orig_len = len;
+	unsigned long flags;
+	unsigned int ch, id;
+	int minor, err;
+
+	if ((err = parse_channels(&buf, &len, channels)) < 1)
+		return err;
+
+	if (!(chan_dev = kzalloc(sizeof(struct chan_device), GFP_KERNEL)))
+		return -ENOBUFS;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	if (port->mode != MODE_RAW && port->mode != MODE_G704) {
+		err = -EINVAL;
+		goto free;
+	}
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++)
+		if (channels[ch] && port->channels[ch] != CHANNEL_UNUSED) {
+			printk(KERN_DEBUG "Channel #%i already in use\n", ch);
+			err = -EBUSY;
+			goto free;
+		}
+
+	for (id = 0; id < MAX_CHAN_DEVICES; id++)
+		if (port->chan_devices[id] == NULL)
+			break;
+
+	if (id == MAX_CHAN_DEVICES) {
+		err = -EBUSY;
+		goto free;
+	}
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++)
+		if (channels[ch])
+			break;
+
+	minor = port->id * MAX_CHAN_DEVICES + ch;
+	chan_dev->id = id;
+	chan_dev->port = port;
+	chan_dev->dev = device_create(hss_class, dev, MKDEV(chan_major, minor),
+				      "hss%uch%u", port->id, ch);
+	if (IS_ERR(chan_dev->dev)) {
+		err = PTR_ERR(chan_dev->dev);
+		goto free;
+	}
+
+	cdev_init(&chan_dev->cdev, &chan_fops);
+	chan_dev->cdev.owner = THIS_MODULE;
+	if ((err = cdev_add(&chan_dev->cdev, MKDEV(chan_major, minor), 1)))
+		goto destroy_device;
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++)
+		if (channels[ch])
+			port->channels[ch] = id;
+	port->chan_devices[id] = chan_dev;
+	dev_set_drvdata(chan_dev->dev, chan_dev);
+	BUG_ON(device_create_file(chan_dev->dev, &chan_attr));
+
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return orig_len;
+
+destroy_device:
+	device_unregister(chan_dev->dev);
+free:
+	kfree(chan_dev);
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return err;
+}
+
+static ssize_t show_hdlc_chan(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	return print_channels(dev_get_drvdata(dev), buf, CHANNEL_HDLC);
+}
+
+static ssize_t set_hdlc_chan(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct port *port = dev_get_drvdata(dev);
+	u8 channels[MAX_CHANNELS];
+	size_t orig_len = len;
+	unsigned long flags;
+	unsigned int ch;
+	int err;
+
+	if ((err = parse_channels(&buf, &len, channels)) < 0)
+		return err;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	if (port->mode != MODE_RAW && port->mode != MODE_G704) {
+		err = -EINVAL;
+		goto err;
+	}
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++)
+		if (channels[ch] &&
+		    port->channels[ch] != CHANNEL_UNUSED &&
+		    port->channels[ch] != CHANNEL_HDLC) {
+			printk(KERN_DEBUG "Channel #%i already in use\n", ch);
+			err = -EBUSY;
+			goto err;
+		}
+
+	for (ch = 0; ch < MAX_CHANNELS; ch++)
+		if (channels[ch])
+			port->channels[ch] = CHANNEL_HDLC;
+		else if (port->channels[ch] == CHANNEL_HDLC)
+			port->channels[ch] = CHANNEL_UNUSED;
+
+	if (port->chan_open_count || port->hdlc_open) {
+		hss_config_set_lut(port);
+		hss_config_load(port);
+	}
+
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return orig_len;
+
+err:
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return err;
+}
+
+static ssize_t show_clock_type(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct port *port = dev_get_drvdata(dev);
+
+	strcpy(buf, port->clock_type == CLOCK_INT ? "int\n" : "ext\n");
+	return 5;
+}
+
+static ssize_t set_clock_type(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t len)
+{
+	struct port *port = dev_get_drvdata(dev);
+	size_t orig_len = len;
+	unsigned long flags;
+	unsigned int clk, err;
+
+	if (len && buf[len - 1] == '\n')
+		len--;
+
+	if (len != 3)
+		return -EINVAL;
+	if (!memcmp(buf, "ext", 3))
+		clk = CLOCK_EXT;
+	else if (!memcmp(buf, "int", 3))
+		clk = CLOCK_INT;
+	else
+		return -EINVAL;
+
+	spin_lock_irqsave(&npe_lock, flags);
+	if (port->plat->set_clock)
+		clk = port->plat->set_clock(port->id, clk);
+	if (clk != CLOCK_EXT && clk != CLOCK_INT) {
+		err = -EINVAL; /* plat->set_clock shouldn't change the state */
+		goto err;
+	}
+	port->clock_type = clk;
+	if (port->chan_open_count || port->hdlc_open) {
+		hss_config_set_line(port);
+		hss_config_load(port);
+	}
+	spin_unlock_irqrestore(&npe_lock, flags);
+
+	return orig_len;
+err:
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return err;
+}
+
+static ssize_t show_clock_rate(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct port *port = dev_get_drvdata(dev);
+
+	sprintf(buf, "%u\n", port->clock_rate);
+	return strlen(buf) + 1;
+}
+
+static ssize_t set_clock_rate(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t len)
+{
+#if 0
+	struct port *port = dev_get_drvdata(dev);
+	size_t orig_len = len;
+	unsigned long flags;
+	unsigned int rate;
+
+	if (len && buf[len - 1] == '\n')
+		len--;
+
+	if (get_number(&buf, &len, &rate, 1, 0xFFFFFFFFu))
+		return -EINVAL;
+	if (len)
+		return -EINVAL;
+
+	spin_lock_irqsave(&npe_lock, flags);
+	port->clock_rate = rate;
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return orig_len;
+#endif
+	return -EINVAL; /* FIXME not yet supported */
+}
+
+static ssize_t show_frame_size(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct port *port = dev_get_drvdata(dev);
+
+	if (port->mode != MODE_RAW && port->mode != MODE_G704)
+		return -EINVAL;
+
+	sprintf(buf, "%u\n", port->frame_size);
+	return strlen(buf) + 1;
+}
+
+static ssize_t set_frame_size(struct device *dev, struct device_attribute *attr,
+			      const char *buf, size_t len)
+{
+	struct port *port = dev_get_drvdata(dev);
+	size_t ret = len;
+	unsigned long flags;
+	unsigned int size;
+
+	if (len && buf[len - 1] == '\n')
+		len--;
+
+	if (get_number(&buf, &len, &size, MIN_FRAME_SIZE, MAX_FRAME_SIZE))
+		return -EINVAL;
+	if (len || size % 8 > 1)
+		return -EINVAL;
+
+	spin_lock_irqsave(&npe_lock, flags);
+	if (port->mode != MODE_RAW && port->mode != MODE_G704)
+		ret = -EINVAL;
+	else if (!port->chan_open_count && !port->hdlc_open)
+		ret = -EBUSY;
+	else {
+		port->frame_size = size;
+		port->frame_sync_offset = 0;
+	}
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return ret;
+}
+
+static ssize_t show_frame_offset(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct port *port = dev_get_drvdata(dev);
+
+	sprintf(buf, "%u\n", port->frame_sync_offset);
+	return strlen(buf) + 1;
+}
+
+static ssize_t set_frame_offset(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t len)
+{
+	struct port *port = dev_get_drvdata(dev);
+	size_t orig_len = len;
+	unsigned long flags;
+	unsigned int offset;
+
+	if (len && buf[len - 1] == '\n')
+		len--;
+
+	if (get_number(&buf, &len, &offset, 0, port->frame_size - 1))
+		return -EINVAL;
+	if (len)
+		return -EINVAL;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	port->frame_sync_offset = offset;
+	if (port->chan_open_count || port->hdlc_open) {
+		hss_config_set_rx_frame(port);
+		hss_config_load(port);
+	}
+
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return orig_len;
+}
+
+static ssize_t show_loopback(struct device *dev, struct device_attribute *attr,
+			     char *buf)
+{
+	struct port *port = dev_get_drvdata(dev);
+
+	sprintf(buf, "%u\n", port->loopback);
+	return strlen(buf) + 1;
+}
+
+static ssize_t set_loopback(struct device *dev, struct device_attribute *attr,
+			    const char *buf, size_t len)
+{
+	struct port *port = dev_get_drvdata(dev);
+	size_t orig_len = len;
+	unsigned long flags;
+	unsigned int lb;
+
+	if (len && buf[len - 1] == '\n')
+		len--;
+
+	if (get_number(&buf, &len, &lb, 0, 1))
+		return -EINVAL;
+	if (len)
+		return -EINVAL;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	if (port->loopback != lb) {
+		port->loopback = lb;
+		if (port->chan_open_count || port->hdlc_open) {
+			hss_config_set_core(port);
+			hss_config_load(port);
+		}
+		if (port->loopback || port->carrier)
+			netif_carrier_on(port->netdev);
+		else
+			netif_carrier_off(port->netdev);
+	}
+
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return orig_len;
+}
+
+static ssize_t show_mode(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct port *port = dev_get_drvdata(dev);
+
+	switch(port->mode) {
+	case MODE_RAW:
+		strcpy(buf, "raw\n");
+		break;
+	case MODE_G704:
+		strcpy(buf, "g704\n");
+		break;
+	default:
+		strcpy(buf, "hdlc\n");
+		break;
+	}
+	return strlen(buf) + 1;
+}
+
+static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t len)
+{
+	struct port *port = dev_get_drvdata(dev);
+	size_t ret = len;
+	unsigned long flags;
+
+	if (len && buf[len - 1] == '\n')
+		len--;
+
+	spin_lock_irqsave(&npe_lock, flags);
+
+	if (port->chan_open_count || port->hdlc_open) {
+		ret = -EBUSY;
+	} else if (len == 4 && !memcmp(buf, "hdlc", 4))
+		port->mode = MODE_HDLC;
+	else if (len == 3 && !memcmp(buf, "raw", 3))
+		port->mode = MODE_RAW;
+	else if (len == 4 && !memcmp(buf, "g704", 4))
+		port->mode = MODE_G704;
+	else
+		ret = -EINVAL;
+
+	spin_unlock_irqrestore(&npe_lock, flags);
+	return ret;
+}
+
+static struct device_attribute hss_attrs[] = {
+	__ATTR(create_chan, 0200, NULL, create_chan),
+	__ATTR(hdlc_chan, 0644, show_hdlc_chan, set_hdlc_chan),
+	__ATTR(clock_type, 0644, show_clock_type, set_clock_type),
+	__ATTR(clock_rate, 0644, show_clock_rate, set_clock_rate),
+	__ATTR(frame_size, 0644, show_frame_size, set_frame_size),
+	__ATTR(frame_offset, 0644, show_frame_offset, set_frame_offset),
+	__ATTR(loopback, 0644, show_loopback, set_loopback),
+	__ATTR(mode, 0644, show_mode, set_mode),
+};
+
+/*****************************************************************************
+ * initialization
+ ****************************************************************************/
+
+static int __devinit hss_init_one(struct platform_device *pdev)
+{
+	struct port *port;
+	struct net_device *dev;
+	hdlc_device *hdlc;
+	int i, err;
+
+	if ((port = kzalloc(sizeof(*port), GFP_KERNEL)) == NULL)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, port);
+	port->id = pdev->id;
+
+	if ((port->npe = npe_request(0)) == NULL) {
+		err = -ENOSYS;
+		goto err_free;
+	}
+
+	port->dev = &pdev->dev;
+	port->plat = pdev->dev.platform_data;
+	if ((port->netdev = dev = alloc_hdlcdev(port)) == NULL) {
+		err = -ENOMEM;
+		goto err_plat;
+	}
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+	hdlc = dev_to_hdlc(dev);
+	hdlc->attach = hss_hdlc_attach;
+	hdlc->xmit = hss_hdlc_xmit;
+	dev->open = hss_hdlc_open;
+	dev->stop = hss_hdlc_close;
+	dev->do_ioctl = hss_hdlc_ioctl;
+	dev->tx_queue_len = 100;
+	port->clock_type = CLOCK_EXT;
+	port->clock_rate = 2048000;
+	port->frame_size = 256; /* E1 */
+	memset(port->channels, CHANNEL_UNUSED, sizeof(port->channels));
+	init_waitqueue_head(&port->chan_tx_waitq);
+	init_waitqueue_head(&port->chan_rx_waitq);
+	netif_napi_add(dev, &port->napi, hss_hdlc_poll, NAPI_WEIGHT);
+
+	if ((err = register_hdlc_device(dev))) /* HDLC mode by default */
+		goto err_free_netdev;
+
+	for (i = 0; i < ARRAY_SIZE(hss_attrs); i++)
+		BUG_ON(device_create_file(port->dev, &hss_attrs[i]));
+
+	printk(KERN_INFO "%s: HSS-%i\n", dev->name, port->id);
+	return 0;
+
+err_free_netdev:
+	free_netdev(dev);
+err_plat:
+	npe_release(port->npe);
+	platform_set_drvdata(pdev, NULL);
+err_free:
+	kfree(port);
+	return err;
+}
+
+static int __devexit hss_remove_one(struct platform_device *pdev)
+{
+	struct port *port = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(hss_attrs); i++)
+		device_remove_file(port->dev, &hss_attrs[i]);
+
+	unregister_hdlc_device(port->netdev);
+	free_netdev(port->netdev);
+	npe_release(port->npe);
+	platform_set_drvdata(pdev, NULL);
+	kfree(port);
+	return 0;
+}
+
+static struct platform_driver drv = {
+	.driver.name	= DRV_NAME,
+	.probe		= hss_init_one,
+	.remove		= hss_remove_one,
+};
+
+static int __init hss_init_module(void)
+{
+	int err;
+	dev_t rdev;
+
+	if ((ixp4xx_read_feature_bits() &
+	     (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS)) !=
+	    (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS))
+		return -ENOSYS;
+
+	if ((err = alloc_chrdev_region(&rdev, 0, HSS_COUNT * MAX_CHAN_DEVICES,
+				       "hss")))
+		return err;
+
+	spin_lock_init(&npe_lock);
+
+	if (IS_ERR(hss_class = class_create(THIS_MODULE, "hss"))) {
+		printk(KERN_ERR "Can't register device class 'hss'\n");
+		err = PTR_ERR(hss_class);
+		goto free_chrdev;
+	}
+	if ((err = platform_driver_register(&drv)))
+		goto destroy_class;
+
+	chan_major = MAJOR(rdev);
+	return 0;
+
+destroy_class:
+	class_destroy(hss_class);
+free_chrdev:
+	unregister_chrdev_region(MKDEV(chan_major, 0),
+				 HSS_COUNT * MAX_CHAN_DEVICES);
+	return err;
+}
+
+static void __exit hss_cleanup_module(void)
+{
+	platform_driver_unregister(&drv);
+	class_destroy(hss_class);
+	unregister_chrdev_region(MKDEV(chan_major, 0),
+				 HSS_COUNT * MAX_CHAN_DEVICES);
+}
+
+MODULE_AUTHOR("Krzysztof Halasa");
+MODULE_DESCRIPTION("Intel IXP4xx HSS driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:ixp4xx_hss");
+module_init(hss_init_module);
+module_exit(hss_cleanup_module);