summaryrefslogblamecommitdiff
path: root/drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
blob: 22913af26db85156e29418f85bb1e70e99d0a24e (plain) (tree)
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
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
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093




























                                                                               
                         
                            






                          
                      


































































































                                                                               













































































































































































                                                                                








                                                                   




























































































































                                                                    


































                                                                            
                                                                          























































































                                                                             














































                                                                               
                                                                        


                                                             

                                                                      













                                                                           
                                                                        


                                                    
                                                                             







































                                                                               






                                                                              










































































































































































































                                                                                     


                                                                 









                                                                    





































































































































































                                                                                   






                                                                       


                           
                                       




                                             

                              




                   











                                                        









                                                         

















                                                                

                                                     













































                                                                                               
                                                          














                                                                                                       

                                              
                                                    










                                                         
                                           

                                                                                
                                                           





                                                                               
                                              
                                                        
















                                                                             
                                                                             























                                                                                        
                                                  
                                                            























































































































                                                                                                               
                                                  
                                                            






                                                                              















































































































































































































































































































































                                                                                                      
                                                                 

                                                                              
                                                                    











































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































                                                                                                                                   


                                                                         
                         
                                       






                                                                          
                                                                     
 
                                                                        







                                                                          
                                                                              













                                                                               
                                                                   


























































































































































































































































































                                                                                       
                                    



























































































































































































































































































                                                                                






                                                            
               













                                                                              
                                                       
















                                                                                        

                                                                     







                                                                              

                                                                
 
                                             






                                                                      

                                                                     
























































































                                                                              






                                                              
                                                 


























































                                                                             
                                        
















































































                                                                               



                                                                                





























                                                          







                                                     



                                                   






















                                                                         
/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/printk.h>
#include <linux/pci_ids.h>
#include <linux/netdevice.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/mmc/sdio.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/card.h>
#include <linux/semaphore.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/bcma/bcma.h>
#include <asm/unaligned.h>
#include <defs.h>
#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include <brcm_hw_ids.h>
#include <soc.h>
#include "sdio_host.h"
#include "sdio_chip.h"

#define DCMD_RESP_TIMEOUT  2000	/* In milli second */

#ifdef BCMDBG

#define BRCMF_TRAP_INFO_SIZE	80

#define CBUF_LEN	(128)

struct rte_log_le {
	__le32 buf;		/* Can't be pointer on (64-bit) hosts */
	__le32 buf_size;
	__le32 idx;
	char *_buf_compat;	/* Redundant pointer for backward compat. */
};

struct rte_console {
	/* Virtual UART
	 * When there is no UART (e.g. Quickturn),
	 * the host should write a complete
	 * input line directly into cbuf and then write
	 * the length into vcons_in.
	 * This may also be used when there is a real UART
	 * (at risk of conflicting with
	 * the real UART).  vcons_out is currently unused.
	 */
	uint vcons_in;
	uint vcons_out;

	/* Output (logging) buffer
	 * Console output is written to a ring buffer log_buf at index log_idx.
	 * The host may read the output when it sees log_idx advance.
	 * Output will be lost if the output wraps around faster than the host
	 * polls.
	 */
	struct rte_log_le log_le;

	/* Console input line buffer
	 * Characters are read one at a time into cbuf
	 * until <CR> is received, then
	 * the buffer is processed as a command line.
	 * Also used for virtual UART.
	 */
	uint cbuf_idx;
	char cbuf[CBUF_LEN];
};

#endif				/* BCMDBG */
#include <chipcommon.h>

#include "dhd.h"
#include "dhd_bus.h"
#include "dhd_proto.h"
#include "dhd_dbg.h"
#include <bcmchip.h>

#define TXQLEN		2048	/* bulk tx queue length */
#define TXHI		(TXQLEN - 256)	/* turn on flow control above TXHI */
#define TXLOW		(TXHI - 256)	/* turn off flow control below TXLOW */
#define PRIOMASK	7

#define TXRETRIES	2	/* # of retries for tx frames */

#define BRCMF_RXBOUND	50	/* Default for max rx frames in
				 one scheduling */

#define BRCMF_TXBOUND	20	/* Default for max tx frames in
				 one scheduling */

#define BRCMF_TXMINMAX	1	/* Max tx frames if rx still pending */

#define MEMBLOCK	2048	/* Block size used for downloading
				 of dongle image */
#define MAX_DATA_BUF	(32 * 1024)	/* Must be large enough to hold
				 biggest possible glom */

#define BRCMF_FIRSTREAD	(1 << 6)


/* SBSDIO_DEVICE_CTL */

/* 1: device will assert busy signal when receiving CMD53 */
#define SBSDIO_DEVCTL_SETBUSY		0x01
/* 1: assertion of sdio interrupt is synchronous to the sdio clock */
#define SBSDIO_DEVCTL_SPI_INTR_SYNC	0x02
/* 1: mask all interrupts to host except the chipActive (rev 8) */
#define SBSDIO_DEVCTL_CA_INT_ONLY	0x04
/* 1: isolate internal sdio signals, put external pads in tri-state; requires
 * sdio bus power cycle to clear (rev 9) */
#define SBSDIO_DEVCTL_PADS_ISO		0x08
/* Force SD->SB reset mapping (rev 11) */
#define SBSDIO_DEVCTL_SB_RST_CTL	0x30
/*   Determined by CoreControl bit */
#define SBSDIO_DEVCTL_RST_CORECTL	0x00
/*   Force backplane reset */
#define SBSDIO_DEVCTL_RST_BPRESET	0x10
/*   Force no backplane reset */
#define SBSDIO_DEVCTL_RST_NOBPRESET	0x20

/* direct(mapped) cis space */

/* MAPPED common CIS address */
#define SBSDIO_CIS_BASE_COMMON		0x1000
/* maximum bytes in one CIS */
#define SBSDIO_CIS_SIZE_LIMIT		0x200
/* cis offset addr is < 17 bits */
#define SBSDIO_CIS_OFT_ADDR_MASK	0x1FFFF

/* manfid tuple length, include tuple, link bytes */
#define SBSDIO_CIS_MANFID_TUPLE_LEN	6

/* intstatus */
#define I_SMB_SW0	(1 << 0)	/* To SB Mail S/W interrupt 0 */
#define I_SMB_SW1	(1 << 1)	/* To SB Mail S/W interrupt 1 */
#define I_SMB_SW2	(1 << 2)	/* To SB Mail S/W interrupt 2 */
#define I_SMB_SW3	(1 << 3)	/* To SB Mail S/W interrupt 3 */
#define I_SMB_SW_MASK	0x0000000f	/* To SB Mail S/W interrupts mask */
#define I_SMB_SW_SHIFT	0	/* To SB Mail S/W interrupts shift */
#define I_HMB_SW0	(1 << 4)	/* To Host Mail S/W interrupt 0 */
#define I_HMB_SW1	(1 << 5)	/* To Host Mail S/W interrupt 1 */
#define I_HMB_SW2	(1 << 6)	/* To Host Mail S/W interrupt 2 */
#define I_HMB_SW3	(1 << 7)	/* To Host Mail S/W interrupt 3 */
#define I_HMB_SW_MASK	0x000000f0	/* To Host Mail S/W interrupts mask */
#define I_HMB_SW_SHIFT	4	/* To Host Mail S/W interrupts shift */
#define I_WR_OOSYNC	(1 << 8)	/* Write Frame Out Of Sync */
#define I_RD_OOSYNC	(1 << 9)	/* Read Frame Out Of Sync */
#define	I_PC		(1 << 10)	/* descriptor error */
#define	I_PD		(1 << 11)	/* data error */
#define	I_DE		(1 << 12)	/* Descriptor protocol Error */
#define	I_RU		(1 << 13)	/* Receive descriptor Underflow */
#define	I_RO		(1 << 14)	/* Receive fifo Overflow */
#define	I_XU		(1 << 15)	/* Transmit fifo Underflow */
#define	I_RI		(1 << 16)	/* Receive Interrupt */
#define I_BUSPWR	(1 << 17)	/* SDIO Bus Power Change (rev 9) */
#define I_XMTDATA_AVAIL (1 << 23)	/* bits in fifo */
#define	I_XI		(1 << 24)	/* Transmit Interrupt */
#define I_RF_TERM	(1 << 25)	/* Read Frame Terminate */
#define I_WF_TERM	(1 << 26)	/* Write Frame Terminate */
#define I_PCMCIA_XU	(1 << 27)	/* PCMCIA Transmit FIFO Underflow */
#define I_SBINT		(1 << 28)	/* sbintstatus Interrupt */
#define I_CHIPACTIVE	(1 << 29)	/* chip from doze to active state */
#define I_SRESET	(1 << 30)	/* CCCR RES interrupt */
#define I_IOE2		(1U << 31)	/* CCCR IOE2 Bit Changed */
#define	I_ERRORS	(I_PC | I_PD | I_DE | I_RU | I_RO | I_XU)
#define I_DMA		(I_RI | I_XI | I_ERRORS)

/* corecontrol */
#define CC_CISRDY		(1 << 0)	/* CIS Ready */
#define CC_BPRESEN		(1 << 1)	/* CCCR RES signal */
#define CC_F2RDY		(1 << 2)	/* set CCCR IOR2 bit */
#define CC_CLRPADSISO		(1 << 3)	/* clear SDIO pads isolation */
#define CC_XMTDATAAVAIL_MODE	(1 << 4)
#define CC_XMTDATAAVAIL_CTRL	(1 << 5)

/* SDA_FRAMECTRL */
#define SFC_RF_TERM	(1 << 0)	/* Read Frame Terminate */
#define SFC_WF_TERM	(1 << 1)	/* Write Frame Terminate */
#define SFC_CRC4WOOS	(1 << 2)	/* CRC error for write out of sync */
#define SFC_ABORTALL	(1 << 3)	/* Abort all in-progress frames */

/* HW frame tag */
#define SDPCM_FRAMETAG_LEN	4	/* 2 bytes len, 2 bytes check val */

/* Total length of frame header for dongle protocol */
#define SDPCM_HDRLEN	(SDPCM_FRAMETAG_LEN + SDPCM_SWHEADER_LEN)
#define SDPCM_RESERVE	(SDPCM_HDRLEN + BRCMF_SDALIGN)

/*
 * Software allocation of To SB Mailbox resources
 */

/* tosbmailbox bits corresponding to intstatus bits */
#define SMB_NAK		(1 << 0)	/* Frame NAK */
#define SMB_INT_ACK	(1 << 1)	/* Host Interrupt ACK */
#define SMB_USE_OOB	(1 << 2)	/* Use OOB Wakeup */
#define SMB_DEV_INT	(1 << 3)	/* Miscellaneous Interrupt */

/* tosbmailboxdata */
#define SMB_DATA_VERSION_SHIFT	16	/* host protocol version */

/*
 * Software allocation of To Host Mailbox resources
 */

/* intstatus bits */
#define I_HMB_FC_STATE	I_HMB_SW0	/* Flow Control State */
#define I_HMB_FC_CHANGE	I_HMB_SW1	/* Flow Control State Changed */
#define I_HMB_FRAME_IND	I_HMB_SW2	/* Frame Indication */
#define I_HMB_HOST_INT	I_HMB_SW3	/* Miscellaneous Interrupt */

/* tohostmailboxdata */
#define HMB_DATA_NAKHANDLED	1	/* retransmit NAK'd frame */
#define HMB_DATA_DEVREADY	2	/* talk to host after enable */
#define HMB_DATA_FC		4	/* per prio flowcontrol update flag */
#define HMB_DATA_FWREADY	8	/* fw ready for protocol activity */

#define HMB_DATA_FCDATA_MASK	0xff000000
#define HMB_DATA_FCDATA_SHIFT	24

#define HMB_DATA_VERSION_MASK	0x00ff0000
#define HMB_DATA_VERSION_SHIFT	16

/*
 * Software-defined protocol header
 */

/* Current protocol version */
#define SDPCM_PROT_VERSION	4

/* SW frame header */
#define SDPCM_PACKET_SEQUENCE(p)	(((u8 *)p)[0] & 0xff)

#define SDPCM_CHANNEL_MASK		0x00000f00
#define SDPCM_CHANNEL_SHIFT		8
#define SDPCM_PACKET_CHANNEL(p)		(((u8 *)p)[1] & 0x0f)

#define SDPCM_NEXTLEN_OFFSET		2

/* Data Offset from SOF (HW Tag, SW Tag, Pad) */
#define SDPCM_DOFFSET_OFFSET		3	/* Data Offset */
#define SDPCM_DOFFSET_VALUE(p)		(((u8 *)p)[SDPCM_DOFFSET_OFFSET] & 0xff)
#define SDPCM_DOFFSET_MASK		0xff000000
#define SDPCM_DOFFSET_SHIFT		24
#define SDPCM_FCMASK_OFFSET		4	/* Flow control */
#define SDPCM_FCMASK_VALUE(p)		(((u8 *)p)[SDPCM_FCMASK_OFFSET] & 0xff)
#define SDPCM_WINDOW_OFFSET		5	/* Credit based fc */
#define SDPCM_WINDOW_VALUE(p)		(((u8 *)p)[SDPCM_WINDOW_OFFSET] & 0xff)

#define SDPCM_SWHEADER_LEN	8	/* SW header is 64 bits */

/* logical channel numbers */
#define SDPCM_CONTROL_CHANNEL	0	/* Control channel Id */
#define SDPCM_EVENT_CHANNEL	1	/* Asyc Event Indication Channel Id */
#define SDPCM_DATA_CHANNEL	2	/* Data Xmit/Recv Channel Id */
#define SDPCM_GLOM_CHANNEL	3	/* For coalesced packets */
#define SDPCM_TEST_CHANNEL	15	/* Reserved for test/debug packets */

#define SDPCM_SEQUENCE_WRAP	256	/* wrap-around val for 8bit frame seq */

#define SDPCM_GLOMDESC(p)	(((u8 *)p)[1] & 0x80)

/*
 * Shared structure between dongle and the host.
 * The structure contains pointers to trap or assert information.
 */
#define SDPCM_SHARED_VERSION       0x0002
#define SDPCM_SHARED_VERSION_MASK  0x00FF
#define SDPCM_SHARED_ASSERT_BUILT  0x0100
#define SDPCM_SHARED_ASSERT        0x0200
#define SDPCM_SHARED_TRAP          0x0400

/* Space for header read, limit for data packets */
#define MAX_HDR_READ	(1 << 6)
#define MAX_RX_DATASZ	2048

/* Maximum milliseconds to wait for F2 to come up */
#define BRCMF_WAIT_F2RDY	3000

/* Bump up limit on waiting for HT to account for first startup;
 * if the image is doing a CRC calculation before programming the PMU
 * for HT availability, it could take a couple hundred ms more, so
 * max out at a 1 second (1000000us).
 */
#undef PMU_MAX_TRANSITION_DLY
#define PMU_MAX_TRANSITION_DLY 1000000

/* Value for ChipClockCSR during initial setup */
#define BRCMF_INIT_CLKCTL1	(SBSDIO_FORCE_HW_CLKREQ_OFF |	\
					SBSDIO_ALP_AVAIL_REQ)

/* Flags for SDH calls */
#define F2SYNC	(SDIO_REQ_4BYTE | SDIO_REQ_FIXED)

/*
 * Conversion of 802.1D priority to precedence level
 */
static uint prio2prec(u32 prio)
{
	return (prio == PRIO_8021D_NONE || prio == PRIO_8021D_BE) ?
	       (prio^2) : prio;
}

/* core registers */
struct sdpcmd_regs {
	u32 corecontrol;		/* 0x00, rev8 */
	u32 corestatus;			/* rev8 */
	u32 PAD[1];
	u32 biststatus;			/* rev8 */

	/* PCMCIA access */
	u16 pcmciamesportaladdr;	/* 0x010, rev8 */
	u16 PAD[1];
	u16 pcmciamesportalmask;	/* rev8 */
	u16 PAD[1];
	u16 pcmciawrframebc;		/* rev8 */
	u16 PAD[1];
	u16 pcmciaunderflowtimer;	/* rev8 */
	u16 PAD[1];

	/* interrupt */
	u32 intstatus;			/* 0x020, rev8 */
	u32 hostintmask;		/* rev8 */
	u32 intmask;			/* rev8 */
	u32 sbintstatus;		/* rev8 */
	u32 sbintmask;			/* rev8 */
	u32 funcintmask;		/* rev4 */
	u32 PAD[2];
	u32 tosbmailbox;		/* 0x040, rev8 */
	u32 tohostmailbox;		/* rev8 */
	u32 tosbmailboxdata;		/* rev8 */
	u32 tohostmailboxdata;		/* rev8 */

	/* synchronized access to registers in SDIO clock domain */
	u32 sdioaccess;			/* 0x050, rev8 */
	u32 PAD[3];

	/* PCMCIA frame control */
	u8 pcmciaframectrl;		/* 0x060, rev8 */
	u8 PAD[3];
	u8 pcmciawatermark;		/* rev8 */
	u8 PAD[155];

	/* interrupt batching control */
	u32 intrcvlazy;			/* 0x100, rev8 */
	u32 PAD[3];

	/* counters */
	u32 cmd52rd;			/* 0x110, rev8 */
	u32 cmd52wr;			/* rev8 */
	u32 cmd53rd;			/* rev8 */
	u32 cmd53wr;			/* rev8 */
	u32 abort;			/* rev8 */
	u32 datacrcerror;		/* rev8 */
	u32 rdoutofsync;		/* rev8 */
	u32 wroutofsync;		/* rev8 */
	u32 writebusy;			/* rev8 */
	u32 readwait;			/* rev8 */
	u32 readterm;			/* rev8 */
	u32 writeterm;			/* rev8 */
	u32 PAD[40];
	u32 clockctlstatus;		/* rev8 */
	u32 PAD[7];

	u32 PAD[128];			/* DMA engines */

	/* SDIO/PCMCIA CIS region */
	char cis[512];			/* 0x400-0x5ff, rev6 */

	/* PCMCIA function control registers */
	char pcmciafcr[256];		/* 0x600-6ff, rev6 */
	u16 PAD[55];

	/* PCMCIA backplane access */
	u16 backplanecsr;		/* 0x76E, rev6 */
	u16 backplaneaddr0;		/* rev6 */
	u16 backplaneaddr1;		/* rev6 */
	u16 backplaneaddr2;		/* rev6 */
	u16 backplaneaddr3;		/* rev6 */
	u16 backplanedata0;		/* rev6 */
	u16 backplanedata1;		/* rev6 */
	u16 backplanedata2;		/* rev6 */
	u16 backplanedata3;		/* rev6 */
	u16 PAD[31];

	/* sprom "size" & "blank" info */
	u16 spromstatus;		/* 0x7BE, rev2 */
	u32 PAD[464];

	u16 PAD[0x80];
};

#ifdef BCMDBG
/* Device console log buffer state */
struct brcmf_console {
	uint count;		/* Poll interval msec counter */
	uint log_addr;		/* Log struct address (fixed) */
	struct rte_log_le log_le;	/* Log struct (host copy) */
	uint bufsize;		/* Size of log buffer */
	u8 *buf;		/* Log buffer (host copy) */
	uint last;		/* Last buffer read index */
};
#endif				/* BCMDBG */

struct sdpcm_shared {
	u32 flags;
	u32 trap_addr;
	u32 assert_exp_addr;
	u32 assert_file_addr;
	u32 assert_line;
	u32 console_addr;	/* Address of struct rte_console */
	u32 msgtrace_addr;
	u8 tag[32];
};

struct sdpcm_shared_le {
	__le32 flags;
	__le32 trap_addr;
	__le32 assert_exp_addr;
	__le32 assert_file_addr;
	__le32 assert_line;
	__le32 console_addr;	/* Address of struct rte_console */
	__le32 msgtrace_addr;
	u8 tag[32];
};


/* misc chip info needed by some of the routines */
/* Private data for SDIO bus interaction */
struct brcmf_bus {
	struct brcmf_pub *drvr;

	struct brcmf_sdio_dev *sdiodev;	/* sdio device handler */
	struct chip_info *ci;	/* Chip info struct */
	char *vars;		/* Variables (from CIS and/or other) */
	uint varsz;		/* Size of variables buffer */

	u32 ramsize;		/* Size of RAM in SOCRAM (bytes) */

	u32 hostintmask;	/* Copy of Host Interrupt Mask */
	u32 intstatus;	/* Intstatus bits (events) pending */
	bool dpc_sched;		/* Indicates DPC schedule (intrpt rcvd) */
	bool fcstate;		/* State of dongle flow-control */

	uint blocksize;		/* Block size of SDIO transfers */
	uint roundup;		/* Max roundup limit */

	struct pktq txq;	/* Queue length used for flow-control */
	u8 flowcontrol;	/* per prio flow control bitmask */
	u8 tx_seq;		/* Transmit sequence number (next) */
	u8 tx_max;		/* Maximum transmit sequence allowed */

	u8 hdrbuf[MAX_HDR_READ + BRCMF_SDALIGN];
	u8 *rxhdr;		/* Header of current rx frame (in hdrbuf) */
	u16 nextlen;		/* Next Read Len from last header */
	u8 rx_seq;		/* Receive sequence number (expected) */
	bool rxskip;		/* Skip receive (awaiting NAK ACK) */

	uint rxbound;		/* Rx frames to read before resched */
	uint txbound;		/* Tx frames to send before resched */
	uint txminmax;

	struct sk_buff *glomd;	/* Packet containing glomming descriptor */
	struct sk_buff_head glom; /* Packet list for glommed superframe */
	uint glomerr;		/* Glom packet read errors */

	u8 *rxbuf;		/* Buffer for receiving control packets */
	uint rxblen;		/* Allocated length of rxbuf */
	u8 *rxctl;		/* Aligned pointer into rxbuf */
	u8 *databuf;		/* Buffer for receiving big glom packet */
	u8 *dataptr;		/* Aligned pointer into databuf */
	uint rxlen;		/* Length of valid data in buffer */

	u8 sdpcm_ver;	/* Bus protocol reported by dongle */

	bool intr;		/* Use interrupts */
	bool poll;		/* Use polling */
	bool ipend;		/* Device interrupt is pending */
	uint intrcount;		/* Count of device interrupt callbacks */
	uint lastintrs;		/* Count as of last watchdog timer */
	uint spurious;		/* Count of spurious interrupts */
	uint pollrate;		/* Ticks between device polls */
	uint polltick;		/* Tick counter */
	uint pollcnt;		/* Count of active polls */

#ifdef BCMDBG
	uint console_interval;
	struct brcmf_console console;	/* Console output polling support */
	uint console_addr;	/* Console address from shared struct */
#endif				/* BCMDBG */

	uint regfails;		/* Count of R_REG failures */

	uint clkstate;		/* State of sd and backplane clock(s) */
	bool activity;		/* Activity flag for clock down */
	s32 idletime;		/* Control for activity timeout */
	s32 idlecount;	/* Activity timeout counter */
	s32 idleclock;	/* How to set bus driver when idle */
	s32 sd_rxchain;
	bool use_rxchain;	/* If brcmf should use PKT chains */
	bool sleeping;		/* Is SDIO bus sleeping? */
	bool rxflow_mode;	/* Rx flow control mode */
	bool rxflow;		/* Is rx flow control on */
	bool alp_only;		/* Don't use HT clock (ALP only) */
/* Field to decide if rx of control frames happen in rxbuf or lb-pool */
	bool usebufpool;

	/* Some additional counters */
	uint tx_sderrs;		/* Count of tx attempts with sd errors */
	uint fcqueued;		/* Tx packets that got queued */
	uint rxrtx;		/* Count of rtx requests (NAK to dongle) */
	uint rx_toolong;	/* Receive frames too long to receive */
	uint rxc_errors;	/* SDIO errors when reading control frames */
	uint rx_hdrfail;	/* SDIO errors on header reads */
	uint rx_badhdr;		/* Bad received headers (roosync?) */
	uint rx_badseq;		/* Mismatched rx sequence number */
	uint fc_rcvd;		/* Number of flow-control events received */
	uint fc_xoff;		/* Number which turned on flow-control */
	uint fc_xon;		/* Number which turned off flow-control */
	uint rxglomfail;	/* Failed deglom attempts */
	uint rxglomframes;	/* Number of glom frames (superframes) */
	uint rxglompkts;	/* Number of packets from glom frames */
	uint f2rxhdrs;		/* Number of header reads */
	uint f2rxdata;		/* Number of frame data reads */
	uint f2txdata;		/* Number of f2 frame writes */
	uint f1regdata;		/* Number of f1 register accesses */

	u8 *ctrl_frame_buf;
	u32 ctrl_frame_len;
	bool ctrl_frame_stat;

	spinlock_t txqlock;
	wait_queue_head_t ctrl_wait;
	wait_queue_head_t dcmd_resp_wait;

	struct timer_list timer;
	struct completion watchdog_wait;
	struct task_struct *watchdog_tsk;
	bool wd_timer_valid;
	uint save_ms;

	struct task_struct *dpc_tsk;
	struct completion dpc_wait;

	struct semaphore sdsem;

	const char *fw_name;
	const struct firmware *firmware;
	const char *nv_name;
	u32 fw_ptr;
};

/* clkstate */
#define CLK_NONE	0
#define CLK_SDONLY	1
#define CLK_PENDING	2	/* Not used yet */
#define CLK_AVAIL	3

#ifdef BCMDBG
static int qcount[NUMPRIO];
static int tx_packets[NUMPRIO];
#endif				/* BCMDBG */

#define SDIO_DRIVE_STRENGTH	6	/* in milliamps */

#define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)

/* Retry count for register access failures */
static const uint retry_limit = 2;

/* Limit on rounding up frames */
static const uint max_roundup = 512;

#define ALIGNMENT  4

static void pkt_align(struct sk_buff *p, int len, int align)
{
	uint datalign;
	datalign = (unsigned long)(p->data);
	datalign = roundup(datalign, (align)) - datalign;
	if (datalign)
		skb_pull(p, datalign);
	__skb_trim(p, len);
}

/* To check if there's window offered */
static bool data_ok(struct brcmf_bus *bus)
{
	return (u8)(bus->tx_max - bus->tx_seq) != 0 &&
	       ((u8)(bus->tx_max - bus->tx_seq) & 0x80) == 0;
}

/*
 * Reads a register in the SDIO hardware block. This block occupies a series of
 * adresses on the 32 bit backplane bus.
 */
static void
r_sdreg32(struct brcmf_bus *bus, u32 *regvar, u32 reg_offset, u32 *retryvar)
{
	u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
	*retryvar = 0;
	do {
		*regvar = brcmf_sdcard_reg_read(bus->sdiodev,
				bus->ci->c_inf[idx].base + reg_offset,
				sizeof(u32));
	} while (brcmf_sdcard_regfail(bus->sdiodev) &&
		 (++(*retryvar) <= retry_limit));
	if (*retryvar) {
		bus->regfails += (*retryvar-1);
		if (*retryvar > retry_limit) {
			brcmf_dbg(ERROR, "FAILED READ %Xh\n", reg_offset);
			*regvar = 0;
		}
	}
}

static void
w_sdreg32(struct brcmf_bus *bus, u32 regval, u32 reg_offset, u32 *retryvar)
{
	u8 idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
	*retryvar = 0;
	do {
		brcmf_sdcard_reg_write(bus->sdiodev,
				       bus->ci->c_inf[idx].base + reg_offset,
				       sizeof(u32), regval);
	} while (brcmf_sdcard_regfail(bus->sdiodev) &&
		 (++(*retryvar) <= retry_limit));
	if (*retryvar) {
		bus->regfails += (*retryvar-1);
		if (*retryvar > retry_limit)
			brcmf_dbg(ERROR, "FAILED REGISTER WRITE %Xh\n",
				  reg_offset);
	}
}

#define PKT_AVAILABLE()		(intstatus & I_HMB_FRAME_IND)

#define HOSTINTMASK		(I_HMB_SW_MASK | I_CHIPACTIVE)

/* Packet free applicable unconditionally for sdio and sdspi.
 * Conditional if bufpool was present for gspi bus.
 */
static void brcmf_sdbrcm_pktfree2(struct brcmf_bus *bus, struct sk_buff *pkt)
{
	if (bus->usebufpool)
		brcmu_pkt_buf_free_skb(pkt);
}

/* Turn backplane clock on or off */
static int brcmf_sdbrcm_htclk(struct brcmf_bus *bus, bool on, bool pendok)
{
	int err;
	u8 clkctl, clkreq, devctl;
	unsigned long timeout;

	brcmf_dbg(TRACE, "Enter\n");

	clkctl = 0;

	if (on) {
		/* Request HT Avail */
		clkreq =
		    bus->alp_only ? SBSDIO_ALP_AVAIL_REQ : SBSDIO_HT_AVAIL_REQ;

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				       SBSDIO_FUNC1_CHIPCLKCSR, clkreq, &err);
		if (err) {
			brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
			return -EBADE;
		}

		/* Check current status */
		clkctl = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					       SBSDIO_FUNC1_CHIPCLKCSR, &err);
		if (err) {
			brcmf_dbg(ERROR, "HT Avail read error: %d\n", err);
			return -EBADE;
		}

		/* Go to pending and await interrupt if appropriate */
		if (!SBSDIO_CLKAV(clkctl, bus->alp_only) && pendok) {
			/* Allow only clock-available interrupt */
			devctl = brcmf_sdcard_cfg_read(bus->sdiodev,
					SDIO_FUNC_1,
					SBSDIO_DEVICE_CTL, &err);
			if (err) {
				brcmf_dbg(ERROR, "Devctl error setting CA: %d\n",
					  err);
				return -EBADE;
			}

			devctl |= SBSDIO_DEVCTL_CA_INT_ONLY;
			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
					       SBSDIO_DEVICE_CTL, devctl, &err);
			brcmf_dbg(INFO, "CLKCTL: set PENDING\n");
			bus->clkstate = CLK_PENDING;

			return 0;
		} else if (bus->clkstate == CLK_PENDING) {
			/* Cancel CA-only interrupt filter */
			devctl =
			    brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
						  SBSDIO_DEVICE_CTL, &err);
			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				SBSDIO_DEVICE_CTL, devctl, &err);
		}

		/* Otherwise, wait here (polling) for HT Avail */
		timeout = jiffies +
			  msecs_to_jiffies(PMU_MAX_TRANSITION_DLY/1000);
		while (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
			clkctl = brcmf_sdcard_cfg_read(bus->sdiodev,
						       SDIO_FUNC_1,
						       SBSDIO_FUNC1_CHIPCLKCSR,
						       &err);
			if (time_after(jiffies, timeout))
				break;
			else
				usleep_range(5000, 10000);
		}
		if (err) {
			brcmf_dbg(ERROR, "HT Avail request error: %d\n", err);
			return -EBADE;
		}
		if (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
			brcmf_dbg(ERROR, "HT Avail timeout (%d): clkctl 0x%02x\n",
				  PMU_MAX_TRANSITION_DLY, clkctl);
			return -EBADE;
		}

		/* Mark clock available */
		bus->clkstate = CLK_AVAIL;
		brcmf_dbg(INFO, "CLKCTL: turned ON\n");

#if defined(BCMDBG)
		if (bus->alp_only != true) {
			if (SBSDIO_ALPONLY(clkctl))
				brcmf_dbg(ERROR, "HT Clock should be on\n");
		}
#endif				/* defined (BCMDBG) */

		bus->activity = true;
	} else {
		clkreq = 0;

		if (bus->clkstate == CLK_PENDING) {
			/* Cancel CA-only interrupt filter */
			devctl = brcmf_sdcard_cfg_read(bus->sdiodev,
					SDIO_FUNC_1,
					SBSDIO_DEVICE_CTL, &err);
			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				SBSDIO_DEVICE_CTL, devctl, &err);
		}

		bus->clkstate = CLK_SDONLY;
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_FUNC1_CHIPCLKCSR, clkreq, &err);
		brcmf_dbg(INFO, "CLKCTL: turned OFF\n");
		if (err) {
			brcmf_dbg(ERROR, "Failed access turning clock off: %d\n",
				  err);
			return -EBADE;
		}
	}
	return 0;
}

/* Change idle/active SD state */
static int brcmf_sdbrcm_sdclk(struct brcmf_bus *bus, bool on)
{
	brcmf_dbg(TRACE, "Enter\n");

	if (on)
		bus->clkstate = CLK_SDONLY;
	else
		bus->clkstate = CLK_NONE;

	return 0;
}

/* Transition SD and backplane clock readiness */
static int brcmf_sdbrcm_clkctl(struct brcmf_bus *bus, uint target, bool pendok)
{
#ifdef BCMDBG
	uint oldstate = bus->clkstate;
#endif				/* BCMDBG */

	brcmf_dbg(TRACE, "Enter\n");

	/* Early exit if we're already there */
	if (bus->clkstate == target) {
		if (target == CLK_AVAIL) {
			brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
			bus->activity = true;
		}
		return 0;
	}

	switch (target) {
	case CLK_AVAIL:
		/* Make sure SD clock is available */
		if (bus->clkstate == CLK_NONE)
			brcmf_sdbrcm_sdclk(bus, true);
		/* Now request HT Avail on the backplane */
		brcmf_sdbrcm_htclk(bus, true, pendok);
		brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
		bus->activity = true;
		break;

	case CLK_SDONLY:
		/* Remove HT request, or bring up SD clock */
		if (bus->clkstate == CLK_NONE)
			brcmf_sdbrcm_sdclk(bus, true);
		else if (bus->clkstate == CLK_AVAIL)
			brcmf_sdbrcm_htclk(bus, false, false);
		else
			brcmf_dbg(ERROR, "request for %d -> %d\n",
				  bus->clkstate, target);
		brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
		break;

	case CLK_NONE:
		/* Make sure to remove HT request */
		if (bus->clkstate == CLK_AVAIL)
			brcmf_sdbrcm_htclk(bus, false, false);
		/* Now remove the SD clock */
		brcmf_sdbrcm_sdclk(bus, false);
		brcmf_sdbrcm_wd_timer(bus, 0);
		break;
	}
#ifdef BCMDBG
	brcmf_dbg(INFO, "%d -> %d\n", oldstate, bus->clkstate);
#endif				/* BCMDBG */

	return 0;
}

static int brcmf_sdbrcm_bussleep(struct brcmf_bus *bus, bool sleep)
{
	uint retries = 0;

	brcmf_dbg(INFO, "request %s (currently %s)\n",
		  sleep ? "SLEEP" : "WAKE",
		  bus->sleeping ? "SLEEP" : "WAKE");

	/* Done if we're already in the requested state */
	if (sleep == bus->sleeping)
		return 0;

	/* Going to sleep: set the alarm and turn off the lights... */
	if (sleep) {
		/* Don't sleep if something is pending */
		if (bus->dpc_sched || bus->rxskip || pktq_len(&bus->txq))
			return -EBUSY;

		/* Make sure the controller has the bus up */
		brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

		/* Tell device to start using OOB wakeup */
		w_sdreg32(bus, SMB_USE_OOB,
			  offsetof(struct sdpcmd_regs, tosbmailbox), &retries);
		if (retries > retry_limit)
			brcmf_dbg(ERROR, "CANNOT SIGNAL CHIP, WILL NOT WAKE UP!!\n");

		/* Turn off our contribution to the HT clock request */
		brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_FUNC1_CHIPCLKCSR,
			SBSDIO_FORCE_HW_CLKREQ_OFF, NULL);

		/* Isolate the bus */
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_DEVICE_CTL,
			SBSDIO_DEVCTL_PADS_ISO, NULL);

		/* Change state */
		bus->sleeping = true;

	} else {
		/* Waking up: bus power up is ok, set local state */

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			SBSDIO_FUNC1_CHIPCLKCSR, 0, NULL);

		/* Make sure the controller has the bus up */
		brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

		/* Send misc interrupt to indicate OOB not needed */
		w_sdreg32(bus, 0, offsetof(struct sdpcmd_regs, tosbmailboxdata),
			  &retries);
		if (retries <= retry_limit)
			w_sdreg32(bus, SMB_DEV_INT,
				  offsetof(struct sdpcmd_regs, tosbmailbox),
				  &retries);

		if (retries > retry_limit)
			brcmf_dbg(ERROR, "CANNOT SIGNAL CHIP TO CLEAR OOB!!\n");

		/* Make sure we have SD bus access */
		brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

		/* Change state */
		bus->sleeping = false;
	}

	return 0;
}

static void bus_wake(struct brcmf_bus *bus)
{
	if (bus->sleeping)
		brcmf_sdbrcm_bussleep(bus, false);
}

static u32 brcmf_sdbrcm_hostmail(struct brcmf_bus *bus)
{
	u32 intstatus = 0;
	u32 hmb_data;
	u8 fcbits;
	uint retries = 0;

	brcmf_dbg(TRACE, "Enter\n");

	/* Read mailbox data and ack that we did so */
	r_sdreg32(bus, &hmb_data,
		  offsetof(struct sdpcmd_regs, tohostmailboxdata), &retries);

	if (retries <= retry_limit)
		w_sdreg32(bus, SMB_INT_ACK,
			  offsetof(struct sdpcmd_regs, tosbmailbox), &retries);
	bus->f1regdata += 2;

	/* Dongle recomposed rx frames, accept them again */
	if (hmb_data & HMB_DATA_NAKHANDLED) {
		brcmf_dbg(INFO, "Dongle reports NAK handled, expect rtx of %d\n",
			  bus->rx_seq);
		if (!bus->rxskip)
			brcmf_dbg(ERROR, "unexpected NAKHANDLED!\n");

		bus->rxskip = false;
		intstatus |= I_HMB_FRAME_IND;
	}

	/*
	 * DEVREADY does not occur with gSPI.
	 */
	if (hmb_data & (HMB_DATA_DEVREADY | HMB_DATA_FWREADY)) {
		bus->sdpcm_ver =
		    (hmb_data & HMB_DATA_VERSION_MASK) >>
		    HMB_DATA_VERSION_SHIFT;
		if (bus->sdpcm_ver != SDPCM_PROT_VERSION)
			brcmf_dbg(ERROR, "Version mismatch, dongle reports %d, "
				  "expecting %d\n",
				  bus->sdpcm_ver, SDPCM_PROT_VERSION);
		else
			brcmf_dbg(INFO, "Dongle ready, protocol version %d\n",
				  bus->sdpcm_ver);
	}

	/*
	 * Flow Control has been moved into the RX headers and this out of band
	 * method isn't used any more.
	 * remaining backward compatible with older dongles.
	 */
	if (hmb_data & HMB_DATA_FC) {
		fcbits = (hmb_data & HMB_DATA_FCDATA_MASK) >>
							HMB_DATA_FCDATA_SHIFT;

		if (fcbits & ~bus->flowcontrol)
			bus->fc_xoff++;

		if (bus->flowcontrol & ~fcbits)
			bus->fc_xon++;

		bus->fc_rcvd++;
		bus->flowcontrol = fcbits;
	}

	/* Shouldn't be any others */
	if (hmb_data & ~(HMB_DATA_DEVREADY |
			 HMB_DATA_NAKHANDLED |
			 HMB_DATA_FC |
			 HMB_DATA_FWREADY |
			 HMB_DATA_FCDATA_MASK | HMB_DATA_VERSION_MASK))
		brcmf_dbg(ERROR, "Unknown mailbox data content: 0x%02x\n",
			  hmb_data);

	return intstatus;
}

static void brcmf_sdbrcm_rxfail(struct brcmf_bus *bus, bool abort, bool rtx)
{
	uint retries = 0;
	u16 lastrbc;
	u8 hi, lo;
	int err;

	brcmf_dbg(ERROR, "%sterminate frame%s\n",
		  abort ? "abort command, " : "",
		  rtx ? ", send NAK" : "");

	if (abort)
		brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);

	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			       SBSDIO_FUNC1_FRAMECTRL,
			       SFC_RF_TERM, &err);
	bus->f1regdata++;

	/* Wait until the packet has been flushed (device/FIFO stable) */
	for (lastrbc = retries = 0xffff; retries > 0; retries--) {
		hi = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					   SBSDIO_FUNC1_RFRAMEBCHI, NULL);
		lo = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					   SBSDIO_FUNC1_RFRAMEBCLO, NULL);
		bus->f1regdata += 2;

		if ((hi == 0) && (lo == 0))
			break;

		if ((hi > (lastrbc >> 8)) && (lo > (lastrbc & 0x00ff))) {
			brcmf_dbg(ERROR, "count growing: last 0x%04x now 0x%04x\n",
				  lastrbc, (hi << 8) + lo);
		}
		lastrbc = (hi << 8) + lo;
	}

	if (!retries)
		brcmf_dbg(ERROR, "count never zeroed: last 0x%04x\n", lastrbc);
	else
		brcmf_dbg(INFO, "flush took %d iterations\n", 0xffff - retries);

	if (rtx) {
		bus->rxrtx++;
		w_sdreg32(bus, SMB_NAK,
			  offsetof(struct sdpcmd_regs, tosbmailbox), &retries);

		bus->f1regdata++;
		if (retries <= retry_limit)
			bus->rxskip = true;
	}

	/* Clear partial in any case */
	bus->nextlen = 0;

	/* If we can't reach the device, signal failure */
	if (err || brcmf_sdcard_regfail(bus->sdiodev))
		bus->drvr->busstate = BRCMF_BUS_DOWN;
}

/* copy a buffer into a pkt buffer chain */
static uint brcmf_sdbrcm_glom_from_buf(struct brcmf_bus *bus, uint len)
{
	uint n, ret = 0;
	struct sk_buff *p;
	u8 *buf;

	buf = bus->dataptr;

	/* copy the data */
	skb_queue_walk(&bus->glom, p) {
		n = min_t(uint, p->len, len);
		memcpy(p->data, buf, n);
		buf += n;
		len -= n;
		ret += n;
		if (!len)
			break;
	}

	return ret;
}

/* return total length of buffer chain */
static uint brcmf_sdbrcm_glom_len(struct brcmf_bus *bus)
{
	struct sk_buff *p;
	uint total;

	total = 0;
	skb_queue_walk(&bus->glom, p)
		total += p->len;
	return total;
}

static void brcmf_sdbrcm_free_glom(struct brcmf_bus *bus)
{
	struct sk_buff *cur, *next;

	skb_queue_walk_safe(&bus->glom, cur, next) {
		skb_unlink(cur, &bus->glom);
		brcmu_pkt_buf_free_skb(cur);
	}
}

static u8 brcmf_sdbrcm_rxglom(struct brcmf_bus *bus, u8 rxseq)
{
	u16 dlen, totlen;
	u8 *dptr, num = 0;

	u16 sublen, check;
	struct sk_buff *pfirst, *plast, *pnext, *save_pfirst;

	int errcode;
	u8 chan, seq, doff, sfdoff;
	u8 txmax;

	int ifidx = 0;
	bool usechain = bus->use_rxchain;

	/* If packets, issue read(s) and send up packet chain */
	/* Return sequence numbers consumed? */

	brcmf_dbg(TRACE, "start: glomd %p glom %p\n",
		  bus->glomd, skb_peek(&bus->glom));

	/* If there's a descriptor, generate the packet chain */
	if (bus->glomd) {
		pfirst = plast = pnext = NULL;
		dlen = (u16) (bus->glomd->len);
		dptr = bus->glomd->data;
		if (!dlen || (dlen & 1)) {
			brcmf_dbg(ERROR, "bad glomd len(%d), ignore descriptor\n",
				  dlen);
			dlen = 0;
		}

		for (totlen = num = 0; dlen; num++) {
			/* Get (and move past) next length */
			sublen = get_unaligned_le16(dptr);
			dlen -= sizeof(u16);
			dptr += sizeof(u16);
			if ((sublen < SDPCM_HDRLEN) ||
			    ((num == 0) && (sublen < (2 * SDPCM_HDRLEN)))) {
				brcmf_dbg(ERROR, "descriptor len %d bad: %d\n",
					  num, sublen);
				pnext = NULL;
				break;
			}
			if (sublen % BRCMF_SDALIGN) {
				brcmf_dbg(ERROR, "sublen %d not multiple of %d\n",
					  sublen, BRCMF_SDALIGN);
				usechain = false;
			}
			totlen += sublen;

			/* For last frame, adjust read len so total
				 is a block multiple */
			if (!dlen) {
				sublen +=
				    (roundup(totlen, bus->blocksize) - totlen);
				totlen = roundup(totlen, bus->blocksize);
			}

			/* Allocate/chain packet for next subframe */
			pnext = brcmu_pkt_buf_get_skb(sublen + BRCMF_SDALIGN);
			if (pnext == NULL) {
				brcmf_dbg(ERROR, "bcm_pkt_buf_get_skb failed, num %d len %d\n",
					  num, sublen);
				break;
			}
			skb_queue_tail(&bus->glom, pnext);

			/* Adhere to start alignment requirements */
			pkt_align(pnext, sublen, BRCMF_SDALIGN);
		}

		/* If all allocations succeeded, save packet chain
			 in bus structure */
		if (pnext) {
			brcmf_dbg(GLOM, "allocated %d-byte packet chain for %d subframes\n",
				  totlen, num);
			if (BRCMF_GLOM_ON() && bus->nextlen &&
			    totlen != bus->nextlen) {
				brcmf_dbg(GLOM, "glomdesc mismatch: nextlen %d glomdesc %d rxseq %d\n",
					  bus->nextlen, totlen, rxseq);
			}
			pfirst = pnext = NULL;
		} else {
			brcmf_sdbrcm_free_glom(bus);
			num = 0;
		}

		/* Done with descriptor packet */
		brcmu_pkt_buf_free_skb(bus->glomd);
		bus->glomd = NULL;
		bus->nextlen = 0;
	}

	/* Ok -- either we just generated a packet chain,
		 or had one from before */
	if (!skb_queue_empty(&bus->glom)) {
		if (BRCMF_GLOM_ON()) {
			brcmf_dbg(GLOM, "try superframe read, packet chain:\n");
			skb_queue_walk(&bus->glom, pnext) {
				brcmf_dbg(GLOM, "    %p: %p len 0x%04x (%d)\n",
					  pnext, (u8 *) (pnext->data),
					  pnext->len, pnext->len);
			}
		}

		pfirst = skb_peek(&bus->glom);
		dlen = (u16) brcmf_sdbrcm_glom_len(bus);

		/* Do an SDIO read for the superframe.  Configurable iovar to
		 * read directly into the chained packet, or allocate a large
		 * packet and and copy into the chain.
		 */
		if (usechain) {
			errcode = brcmf_sdcard_recv_buf(bus->sdiodev,
					bus->sdiodev->sbwad,
					SDIO_FUNC_2,
					F2SYNC, (u8 *) pfirst->data, dlen,
					pfirst);
		} else if (bus->dataptr) {
			errcode = brcmf_sdcard_recv_buf(bus->sdiodev,
					bus->sdiodev->sbwad,
					SDIO_FUNC_2,
					F2SYNC, bus->dataptr, dlen,
					NULL);
			sublen = (u16) brcmf_sdbrcm_glom_from_buf(bus, dlen);
			if (sublen != dlen) {
				brcmf_dbg(ERROR, "FAILED TO COPY, dlen %d sublen %d\n",
					  dlen, sublen);
				errcode = -1;
			}
			pnext = NULL;
		} else {
			brcmf_dbg(ERROR, "COULDN'T ALLOC %d-BYTE GLOM, FORCE FAILURE\n",
				  dlen);
			errcode = -1;
		}
		bus->f2rxdata++;

		/* On failure, kill the superframe, allow a couple retries */
		if (errcode < 0) {
			brcmf_dbg(ERROR, "glom read of %d bytes failed: %d\n",
				  dlen, errcode);
			bus->drvr->rx_errors++;

			if (bus->glomerr++ < 3) {
				brcmf_sdbrcm_rxfail(bus, true, true);
			} else {
				bus->glomerr = 0;
				brcmf_sdbrcm_rxfail(bus, true, false);
				bus->rxglomfail++;
				brcmf_sdbrcm_free_glom(bus);
			}
			return 0;
		}
#ifdef BCMDBG
		if (BRCMF_GLOM_ON()) {
			printk(KERN_DEBUG "SUPERFRAME:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
				pfirst->data, min_t(int, pfirst->len, 48));
		}
#endif

		/* Validate the superframe header */
		dptr = (u8 *) (pfirst->data);
		sublen = get_unaligned_le16(dptr);
		check = get_unaligned_le16(dptr + sizeof(u16));

		chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
		seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
		bus->nextlen = dptr[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
		if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
			brcmf_dbg(INFO, "nextlen too large (%d) seq %d\n",
				  bus->nextlen, seq);
			bus->nextlen = 0;
		}
		doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
		txmax = SDPCM_WINDOW_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);

		errcode = 0;
		if ((u16)~(sublen ^ check)) {
			brcmf_dbg(ERROR, "(superframe): HW hdr error: len/check 0x%04x/0x%04x\n",
				  sublen, check);
			errcode = -1;
		} else if (roundup(sublen, bus->blocksize) != dlen) {
			brcmf_dbg(ERROR, "(superframe): len 0x%04x, rounded 0x%04x, expect 0x%04x\n",
				  sublen, roundup(sublen, bus->blocksize),
				  dlen);
			errcode = -1;
		} else if (SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]) !=
			   SDPCM_GLOM_CHANNEL) {
			brcmf_dbg(ERROR, "(superframe): bad channel %d\n",
				  SDPCM_PACKET_CHANNEL(
					  &dptr[SDPCM_FRAMETAG_LEN]));
			errcode = -1;
		} else if (SDPCM_GLOMDESC(&dptr[SDPCM_FRAMETAG_LEN])) {
			brcmf_dbg(ERROR, "(superframe): got 2nd descriptor?\n");
			errcode = -1;
		} else if ((doff < SDPCM_HDRLEN) ||
			   (doff > (pfirst->len - SDPCM_HDRLEN))) {
			brcmf_dbg(ERROR, "(superframe): Bad data offset %d: HW %d pkt %d min %d\n",
				  doff, sublen, pfirst->len, SDPCM_HDRLEN);
			errcode = -1;
		}

		/* Check sequence number of superframe SW header */
		if (rxseq != seq) {
			brcmf_dbg(INFO, "(superframe) rx_seq %d, expected %d\n",
				  seq, rxseq);
			bus->rx_badseq++;
			rxseq = seq;
		}

		/* Check window for sanity */
		if ((u8) (txmax - bus->tx_seq) > 0x40) {
			brcmf_dbg(ERROR, "unlikely tx max %d with tx_seq %d\n",
				  txmax, bus->tx_seq);
			txmax = bus->tx_seq + 2;
		}
		bus->tx_max = txmax;

		/* Remove superframe header, remember offset */
		skb_pull(pfirst, doff);
		sfdoff = doff;

		/* Validate all the subframe headers */
		for (num = 0, pnext = pfirst; pnext && !errcode;
		     num++, pnext = pnext->next) {
			dptr = (u8 *) (pnext->data);
			dlen = (u16) (pnext->len);
			sublen = get_unaligned_le16(dptr);
			check = get_unaligned_le16(dptr + sizeof(u16));
			chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
			doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);
#ifdef BCMDBG
			if (BRCMF_GLOM_ON()) {
				printk(KERN_DEBUG "subframe:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     dptr, 32);
			}
#endif

			if ((u16)~(sublen ^ check)) {
				brcmf_dbg(ERROR, "(subframe %d): HW hdr error: len/check 0x%04x/0x%04x\n",
					  num, sublen, check);
				errcode = -1;
			} else if ((sublen > dlen) || (sublen < SDPCM_HDRLEN)) {
				brcmf_dbg(ERROR, "(subframe %d): length mismatch: len 0x%04x, expect 0x%04x\n",
					  num, sublen, dlen);
				errcode = -1;
			} else if ((chan != SDPCM_DATA_CHANNEL) &&
				   (chan != SDPCM_EVENT_CHANNEL)) {
				brcmf_dbg(ERROR, "(subframe %d): bad channel %d\n",
					  num, chan);
				errcode = -1;
			} else if ((doff < SDPCM_HDRLEN) || (doff > sublen)) {
				brcmf_dbg(ERROR, "(subframe %d): Bad data offset %d: HW %d min %d\n",
					  num, doff, sublen, SDPCM_HDRLEN);
				errcode = -1;
			}
		}

		if (errcode) {
			/* Terminate frame on error, request
				 a couple retries */
			if (bus->glomerr++ < 3) {
				/* Restore superframe header space */
				skb_push(pfirst, sfdoff);
				brcmf_sdbrcm_rxfail(bus, true, true);
			} else {
				bus->glomerr = 0;
				brcmf_sdbrcm_rxfail(bus, true, false);
				bus->rxglomfail++;
				brcmf_sdbrcm_free_glom(bus);
			}
			bus->nextlen = 0;
			return 0;
		}

		/* Basic SD framing looks ok - process each packet (header) */
		save_pfirst = pfirst;
		plast = NULL;

		for (num = 0; pfirst; rxseq++, pfirst = pnext) {
			pnext = pfirst->next;
			pfirst->next = NULL;

			dptr = (u8 *) (pfirst->data);
			sublen = get_unaligned_le16(dptr);
			chan = SDPCM_PACKET_CHANNEL(&dptr[SDPCM_FRAMETAG_LEN]);
			seq = SDPCM_PACKET_SEQUENCE(&dptr[SDPCM_FRAMETAG_LEN]);
			doff = SDPCM_DOFFSET_VALUE(&dptr[SDPCM_FRAMETAG_LEN]);

			brcmf_dbg(GLOM, "Get subframe %d, %p(%p/%d), sublen %d chan %d seq %d\n",
				  num, pfirst, pfirst->data,
				  pfirst->len, sublen, chan, seq);

			/* precondition: chan == SDPCM_DATA_CHANNEL ||
					 chan == SDPCM_EVENT_CHANNEL */

			if (rxseq != seq) {
				brcmf_dbg(GLOM, "rx_seq %d, expected %d\n",
					  seq, rxseq);
				bus->rx_badseq++;
				rxseq = seq;
			}
#ifdef BCMDBG
			if (BRCMF_BYTES_ON() && BRCMF_DATA_ON()) {
				printk(KERN_DEBUG "Rx Subframe Data:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     dptr, dlen);
			}
#endif

			__skb_trim(pfirst, sublen);
			skb_pull(pfirst, doff);

			if (pfirst->len == 0) {
				brcmu_pkt_buf_free_skb(pfirst);
				if (plast)
					plast->next = pnext;
				else
					save_pfirst = pnext;

				continue;
			} else if (brcmf_proto_hdrpull(bus->drvr, &ifidx,
						       pfirst) != 0) {
				brcmf_dbg(ERROR, "rx protocol error\n");
				bus->drvr->rx_errors++;
				brcmu_pkt_buf_free_skb(pfirst);
				if (plast)
					plast->next = pnext;
				else
					save_pfirst = pnext;

				continue;
			}

			/* this packet will go up, link back into
				 chain and count it */
			pfirst->next = pnext;
			plast = pfirst;
			num++;

#ifdef BCMDBG
			if (BRCMF_GLOM_ON()) {
				brcmf_dbg(GLOM, "subframe %d to stack, %p (%p/%d) nxt/lnk %p/%p\n",
					  num, pfirst, pfirst->data,
					  pfirst->len, pfirst->next,
					  pfirst->prev);
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						pfirst->data,
						min_t(int, pfirst->len, 32));
			}
#endif				/* BCMDBG */
		}
		if (num) {
			up(&bus->sdsem);
			brcmf_rx_frame(bus->drvr, ifidx, save_pfirst, num);
			down(&bus->sdsem);
		}

		bus->rxglomframes++;
		bus->rxglompkts += num;
	}
	return num;
}

static int brcmf_sdbrcm_dcmd_resp_wait(struct brcmf_bus *bus, uint *condition,
					bool *pending)
{
	DECLARE_WAITQUEUE(wait, current);
	int timeout = msecs_to_jiffies(DCMD_RESP_TIMEOUT);

	/* Wait until control frame is available */
	add_wait_queue(&bus->dcmd_resp_wait, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	while (!(*condition) && (!signal_pending(current) && timeout))
		timeout = schedule_timeout(timeout);

	if (signal_pending(current))
		*pending = true;

	set_current_state(TASK_RUNNING);
	remove_wait_queue(&bus->dcmd_resp_wait, &wait);

	return timeout;
}

static int brcmf_sdbrcm_dcmd_resp_wake(struct brcmf_bus *bus)
{
	if (waitqueue_active(&bus->dcmd_resp_wait))
		wake_up_interruptible(&bus->dcmd_resp_wait);

	return 0;
}
static void
brcmf_sdbrcm_read_control(struct brcmf_bus *bus, u8 *hdr, uint len, uint doff)
{
	uint rdlen, pad;

	int sdret;

	brcmf_dbg(TRACE, "Enter\n");

	/* Set rxctl for frame (w/optional alignment) */
	bus->rxctl = bus->rxbuf;
	bus->rxctl += BRCMF_FIRSTREAD;
	pad = ((unsigned long)bus->rxctl % BRCMF_SDALIGN);
	if (pad)
		bus->rxctl += (BRCMF_SDALIGN - pad);
	bus->rxctl -= BRCMF_FIRSTREAD;

	/* Copy the already-read portion over */
	memcpy(bus->rxctl, hdr, BRCMF_FIRSTREAD);
	if (len <= BRCMF_FIRSTREAD)
		goto gotpkt;

	/* Raise rdlen to next SDIO block to avoid tail command */
	rdlen = len - BRCMF_FIRSTREAD;
	if (bus->roundup && bus->blocksize && (rdlen > bus->blocksize)) {
		pad = bus->blocksize - (rdlen % bus->blocksize);
		if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
		    ((len + pad) < bus->drvr->maxctl))
			rdlen += pad;
	} else if (rdlen % BRCMF_SDALIGN) {
		rdlen += BRCMF_SDALIGN - (rdlen % BRCMF_SDALIGN);
	}

	/* Satisfy length-alignment requirements */
	if (rdlen & (ALIGNMENT - 1))
		rdlen = roundup(rdlen, ALIGNMENT);

	/* Drop if the read is too big or it exceeds our maximum */
	if ((rdlen + BRCMF_FIRSTREAD) > bus->drvr->maxctl) {
		brcmf_dbg(ERROR, "%d-byte control read exceeds %d-byte buffer\n",
			  rdlen, bus->drvr->maxctl);
		bus->drvr->rx_errors++;
		brcmf_sdbrcm_rxfail(bus, false, false);
		goto done;
	}

	if ((len - doff) > bus->drvr->maxctl) {
		brcmf_dbg(ERROR, "%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\n",
			  len, len - doff, bus->drvr->maxctl);
		bus->drvr->rx_errors++;
		bus->rx_toolong++;
		brcmf_sdbrcm_rxfail(bus, false, false);
		goto done;
	}

	/* Read remainder of frame body into the rxctl buffer */
	sdret = brcmf_sdcard_recv_buf(bus->sdiodev,
				bus->sdiodev->sbwad,
				SDIO_FUNC_2,
				F2SYNC, (bus->rxctl + BRCMF_FIRSTREAD), rdlen,
				NULL);
	bus->f2rxdata++;

	/* Control frame failures need retransmission */
	if (sdret < 0) {
		brcmf_dbg(ERROR, "read %d control bytes failed: %d\n",
			  rdlen, sdret);
		bus->rxc_errors++;
		brcmf_sdbrcm_rxfail(bus, true, true);
		goto done;
	}

gotpkt:

#ifdef BCMDBG
	if (BRCMF_BYTES_ON() && BRCMF_CTL_ON()) {
		printk(KERN_DEBUG "RxCtrl:\n");
		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, bus->rxctl, len);
	}
#endif

	/* Point to valid data and indicate its length */
	bus->rxctl += doff;
	bus->rxlen = len - doff;

done:
	/* Awake any waiters */
	brcmf_sdbrcm_dcmd_resp_wake(bus);
}

/* Pad read to blocksize for efficiency */
static void brcmf_pad(struct brcmf_bus *bus, u16 *pad, u16 *rdlen)
{
	if (bus->roundup && bus->blocksize && *rdlen > bus->blocksize) {
		*pad = bus->blocksize - (*rdlen % bus->blocksize);
		if (*pad <= bus->roundup && *pad < bus->blocksize &&
		    *rdlen + *pad + BRCMF_FIRSTREAD < MAX_RX_DATASZ)
			*rdlen += *pad;
	} else if (*rdlen % BRCMF_SDALIGN) {
		*rdlen += BRCMF_SDALIGN - (*rdlen % BRCMF_SDALIGN);
	}
}

static void
brcmf_alloc_pkt_and_read(struct brcmf_bus *bus, u16 rdlen,
			 struct sk_buff **pkt, u8 **rxbuf)
{
	int sdret;		/* Return code from calls */

	*pkt = brcmu_pkt_buf_get_skb(rdlen + BRCMF_SDALIGN);
	if (*pkt == NULL)
		return;

	pkt_align(*pkt, rdlen, BRCMF_SDALIGN);
	*rxbuf = (u8 *) ((*pkt)->data);
	/* Read the entire frame */
	sdret = brcmf_sdcard_recv_buf(bus->sdiodev, bus->sdiodev->sbwad,
				      SDIO_FUNC_2, F2SYNC,
				      *rxbuf, rdlen, *pkt);
	bus->f2rxdata++;

	if (sdret < 0) {
		brcmf_dbg(ERROR, "(nextlen): read %d bytes failed: %d\n",
			  rdlen, sdret);
		brcmu_pkt_buf_free_skb(*pkt);
		bus->drvr->rx_errors++;
		/* Force retry w/normal header read.
		 * Don't attempt NAK for
		 * gSPI
		 */
		brcmf_sdbrcm_rxfail(bus, true, true);
		*pkt = NULL;
	}
}

/* Checks the header */
static int
brcmf_check_rxbuf(struct brcmf_bus *bus, struct sk_buff *pkt, u8 *rxbuf,
		  u8 rxseq, u16 nextlen, u16 *len)
{
	u16 check;
	bool len_consistent;	/* Result of comparing readahead len and
				   len from hw-hdr */

	memcpy(bus->rxhdr, rxbuf, SDPCM_HDRLEN);

	/* Extract hardware header fields */
	*len = get_unaligned_le16(bus->rxhdr);
	check = get_unaligned_le16(bus->rxhdr + sizeof(u16));

	/* All zeros means readahead info was bad */
	if (!(*len | check)) {
		brcmf_dbg(INFO, "(nextlen): read zeros in HW header???\n");
		goto fail;
	}

	/* Validate check bytes */
	if ((u16)~(*len ^ check)) {
		brcmf_dbg(ERROR, "(nextlen): HW hdr error: nextlen/len/check 0x%04x/0x%04x/0x%04x\n",
			  nextlen, *len, check);
		bus->rx_badhdr++;
		brcmf_sdbrcm_rxfail(bus, false, false);
		goto fail;
	}

	/* Validate frame length */
	if (*len < SDPCM_HDRLEN) {
		brcmf_dbg(ERROR, "(nextlen): HW hdr length invalid: %d\n",
			  *len);
		goto fail;
	}

	/* Check for consistency with readahead info */
	len_consistent = (nextlen != (roundup(*len, 16) >> 4));
	if (len_consistent) {
		/* Mismatch, force retry w/normal
			header (may be >4K) */
		brcmf_dbg(ERROR, "(nextlen): mismatch, nextlen %d len %d rnd %d; expected rxseq %d\n",
			  nextlen, *len, roundup(*len, 16),
			  rxseq);
		brcmf_sdbrcm_rxfail(bus, true, true);
		goto fail;
	}

	return 0;

fail:
	brcmf_sdbrcm_pktfree2(bus, pkt);
	return -EINVAL;
}

/* Return true if there may be more frames to read */
static uint
brcmf_sdbrcm_readframes(struct brcmf_bus *bus, uint maxframes, bool *finished)
{
	u16 len, check;	/* Extracted hardware header fields */
	u8 chan, seq, doff;	/* Extracted software header fields */
	u8 fcbits;		/* Extracted fcbits from software header */

	struct sk_buff *pkt;		/* Packet for event or data frames */
	u16 pad;		/* Number of pad bytes to read */
	u16 rdlen;		/* Total number of bytes to read */
	u8 rxseq;		/* Next sequence number to expect */
	uint rxleft = 0;	/* Remaining number of frames allowed */
	int sdret;		/* Return code from calls */
	u8 txmax;		/* Maximum tx sequence offered */
	u8 *rxbuf;
	int ifidx = 0;
	uint rxcount = 0;	/* Total frames read */

	brcmf_dbg(TRACE, "Enter\n");

	/* Not finished unless we encounter no more frames indication */
	*finished = false;

	for (rxseq = bus->rx_seq, rxleft = maxframes;
	     !bus->rxskip && rxleft && bus->drvr->busstate != BRCMF_BUS_DOWN;
	     rxseq++, rxleft--) {

		/* Handle glomming separately */
		if (bus->glomd || !skb_queue_empty(&bus->glom)) {
			u8 cnt;
			brcmf_dbg(GLOM, "calling rxglom: glomd %p, glom %p\n",
				  bus->glomd, skb_peek(&bus->glom));
			cnt = brcmf_sdbrcm_rxglom(bus, rxseq);
			brcmf_dbg(GLOM, "rxglom returned %d\n", cnt);
			rxseq += cnt - 1;
			rxleft = (rxleft > cnt) ? (rxleft - cnt) : 1;
			continue;
		}

		/* Try doing single read if we can */
		if (bus->nextlen) {
			u16 nextlen = bus->nextlen;
			bus->nextlen = 0;

			rdlen = len = nextlen << 4;
			brcmf_pad(bus, &pad, &rdlen);

			/*
			 * After the frame is received we have to
			 * distinguish whether it is data
			 * or non-data frame.
			 */
			brcmf_alloc_pkt_and_read(bus, rdlen, &pkt, &rxbuf);
			if (pkt == NULL) {
				/* Give up on data, request rtx of events */
				brcmf_dbg(ERROR, "(nextlen): brcmf_alloc_pkt_and_read failed: len %d rdlen %d expected rxseq %d\n",
					  len, rdlen, rxseq);
				continue;
			}

			if (brcmf_check_rxbuf(bus, pkt, rxbuf, rxseq, nextlen,
					      &len) < 0)
				continue;

			/* Extract software header fields */
			chan = SDPCM_PACKET_CHANNEL(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
			seq = SDPCM_PACKET_SEQUENCE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
			doff = SDPCM_DOFFSET_VALUE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
			txmax = SDPCM_WINDOW_VALUE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

			bus->nextlen =
			    bus->rxhdr[SDPCM_FRAMETAG_LEN +
				       SDPCM_NEXTLEN_OFFSET];
			if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
				brcmf_dbg(INFO, "(nextlen): got frame w/nextlen too large (%d), seq %d\n",
					  bus->nextlen, seq);
				bus->nextlen = 0;
			}

			bus->drvr->rx_readahead_cnt++;

			/* Handle Flow Control */
			fcbits = SDPCM_FCMASK_VALUE(
					&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

			if (bus->flowcontrol != fcbits) {
				if (~bus->flowcontrol & fcbits)
					bus->fc_xoff++;

				if (bus->flowcontrol & ~fcbits)
					bus->fc_xon++;

				bus->fc_rcvd++;
				bus->flowcontrol = fcbits;
			}

			/* Check and update sequence number */
			if (rxseq != seq) {
				brcmf_dbg(INFO, "(nextlen): rx_seq %d, expected %d\n",
					  seq, rxseq);
				bus->rx_badseq++;
				rxseq = seq;
			}

			/* Check window for sanity */
			if ((u8) (txmax - bus->tx_seq) > 0x40) {
				brcmf_dbg(ERROR, "got unlikely tx max %d with tx_seq %d\n",
					  txmax, bus->tx_seq);
				txmax = bus->tx_seq + 2;
			}
			bus->tx_max = txmax;

#ifdef BCMDBG
			if (BRCMF_BYTES_ON() && BRCMF_DATA_ON()) {
				printk(KERN_DEBUG "Rx Data:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     rxbuf, len);
			} else if (BRCMF_HDRS_ON()) {
				printk(KERN_DEBUG "RxHdr:\n");
				print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
						     bus->rxhdr, SDPCM_HDRLEN);
			}
#endif

			if (chan == SDPCM_CONTROL_CHANNEL) {
				brcmf_dbg(ERROR, "(nextlen): readahead on control packet %d?\n",
					  seq);
				/* Force retry w/normal header read */
				bus->nextlen = 0;
				brcmf_sdbrcm_rxfail(bus, false, true);
				brcmf_sdbrcm_pktfree2(bus, pkt);
				continue;
			}

			/* Validate data offset */
			if ((doff < SDPCM_HDRLEN) || (doff > len)) {
				brcmf_dbg(ERROR, "(nextlen): bad data offset %d: HW len %d min %d\n",
					  doff, len, SDPCM_HDRLEN);
				brcmf_sdbrcm_rxfail(bus, false, false);
				brcmf_sdbrcm_pktfree2(bus, pkt);
				continue;
			}

			/* All done with this one -- now deliver the packet */
			goto deliver;
		}

		/* Read frame header (hardware and software) */
		sdret = brcmf_sdcard_recv_buf(bus->sdiodev, bus->sdiodev->sbwad,
					      SDIO_FUNC_2, F2SYNC, bus->rxhdr,
					      BRCMF_FIRSTREAD, NULL);
		bus->f2rxhdrs++;

		if (sdret < 0) {
			brcmf_dbg(ERROR, "RXHEADER FAILED: %d\n", sdret);
			bus->rx_hdrfail++;
			brcmf_sdbrcm_rxfail(bus, true, true);
			continue;
		}
#ifdef BCMDBG
		if (BRCMF_BYTES_ON() || BRCMF_HDRS_ON()) {
			printk(KERN_DEBUG "RxHdr:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
					     bus->rxhdr, SDPCM_HDRLEN);
		}
#endif

		/* Extract hardware header fields */
		len = get_unaligned_le16(bus->rxhdr);
		check = get_unaligned_le16(bus->rxhdr + sizeof(u16));

		/* All zeros means no more frames */
		if (!(len | check)) {
			*finished = true;
			break;
		}

		/* Validate check bytes */
		if ((u16) ~(len ^ check)) {
			brcmf_dbg(ERROR, "HW hdr err: len/check 0x%04x/0x%04x\n",
				  len, check);
			bus->rx_badhdr++;
			brcmf_sdbrcm_rxfail(bus, false, false);
			continue;
		}

		/* Validate frame length */
		if (len < SDPCM_HDRLEN) {
			brcmf_dbg(ERROR, "HW hdr length invalid: %d\n", len);
			continue;
		}

		/* Extract software header fields */
		chan = SDPCM_PACKET_CHANNEL(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
		seq = SDPCM_PACKET_SEQUENCE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
		doff = SDPCM_DOFFSET_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);
		txmax = SDPCM_WINDOW_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

		/* Validate data offset */
		if ((doff < SDPCM_HDRLEN) || (doff > len)) {
			brcmf_dbg(ERROR, "Bad data offset %d: HW len %d, min %d seq %d\n",
				  doff, len, SDPCM_HDRLEN, seq);
			bus->rx_badhdr++;
			brcmf_sdbrcm_rxfail(bus, false, false);
			continue;
		}

		/* Save the readahead length if there is one */
		bus->nextlen =
		    bus->rxhdr[SDPCM_FRAMETAG_LEN + SDPCM_NEXTLEN_OFFSET];
		if ((bus->nextlen << 4) > MAX_RX_DATASZ) {
			brcmf_dbg(INFO, "(nextlen): got frame w/nextlen too large (%d), seq %d\n",
				  bus->nextlen, seq);
			bus->nextlen = 0;
		}

		/* Handle Flow Control */
		fcbits = SDPCM_FCMASK_VALUE(&bus->rxhdr[SDPCM_FRAMETAG_LEN]);

		if (bus->flowcontrol != fcbits) {
			if (~bus->flowcontrol & fcbits)
				bus->fc_xoff++;

			if (bus->flowcontrol & ~fcbits)
				bus->fc_xon++;

			bus->fc_rcvd++;
			bus->flowcontrol = fcbits;
		}

		/* Check and update sequence number */
		if (rxseq != seq) {
			brcmf_dbg(INFO, "rx_seq %d, expected %d\n", seq, rxseq);
			bus->rx_badseq++;
			rxseq = seq;
		}

		/* Check window for sanity */
		if ((u8) (txmax - bus->tx_seq) > 0x40) {
			brcmf_dbg(ERROR, "unlikely tx max %d with tx_seq %d\n",
				  txmax, bus->tx_seq);
			txmax = bus->tx_seq + 2;
		}
		bus->tx_max = txmax;

		/* Call a separate function for control frames */
		if (chan == SDPCM_CONTROL_CHANNEL) {
			brcmf_sdbrcm_read_control(bus, bus->rxhdr, len, doff);
			continue;
		}

		/* precondition: chan is either SDPCM_DATA_CHANNEL,
		   SDPCM_EVENT_CHANNEL, SDPCM_TEST_CHANNEL or
		   SDPCM_GLOM_CHANNEL */

		/* Length to read */
		rdlen = (len > BRCMF_FIRSTREAD) ? (len - BRCMF_FIRSTREAD) : 0;

		/* May pad read to blocksize for efficiency */
		if (bus->roundup && bus->blocksize &&
			(rdlen > bus->blocksize)) {
			pad = bus->blocksize - (rdlen % bus->blocksize);
			if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
			    ((rdlen + pad + BRCMF_FIRSTREAD) < MAX_RX_DATASZ))
				rdlen += pad;
		} else if (rdlen % BRCMF_SDALIGN) {
			rdlen += BRCMF_SDALIGN - (rdlen % BRCMF_SDALIGN);
		}

		/* Satisfy length-alignment requirements */
		if (rdlen & (ALIGNMENT - 1))
			rdlen = roundup(rdlen, ALIGNMENT);

		if ((rdlen + BRCMF_FIRSTREAD) > MAX_RX_DATASZ) {
			/* Too long -- skip this frame */
			brcmf_dbg(ERROR, "too long: len %d rdlen %d\n",
				  len, rdlen);
			bus->drvr->rx_errors++;
			bus->rx_toolong++;
			brcmf_sdbrcm_rxfail(bus, false, false);
			continue;
		}

		pkt = brcmu_pkt_buf_get_skb(rdlen +
					    BRCMF_FIRSTREAD + BRCMF_SDALIGN);
		if (!pkt) {
			/* Give up on data, request rtx of events */
			brcmf_dbg(ERROR, "brcmu_pkt_buf_get_skb failed: rdlen %d chan %d\n",
				  rdlen, chan);
			bus->drvr->rx_dropped++;
			brcmf_sdbrcm_rxfail(bus, false, RETRYCHAN(chan));
			continue;
		}

		/* Leave room for what we already read, and align remainder */
		skb_pull(pkt, BRCMF_FIRSTREAD);
		pkt_align(pkt, rdlen, BRCMF_SDALIGN);

		/* Read the remaining frame data */
		sdret = brcmf_sdcard_recv_buf(bus->sdiodev, bus->sdiodev->sbwad,
				SDIO_FUNC_2, F2SYNC, ((u8 *) (pkt->data)),
				rdlen, pkt);
		bus->f2rxdata++;

		if (sdret < 0) {
			brcmf_dbg(ERROR, "read %d %s bytes failed: %d\n", rdlen,
				  ((chan == SDPCM_EVENT_CHANNEL) ? "event"
				   : ((chan == SDPCM_DATA_CHANNEL) ? "data"
				      : "test")), sdret);
			brcmu_pkt_buf_free_skb(pkt);
			bus->drvr->rx_errors++;
			brcmf_sdbrcm_rxfail(bus, true, RETRYCHAN(chan));
			continue;
		}

		/* Copy the already-read portion */
		skb_push(pkt, BRCMF_FIRSTREAD);
		memcpy(pkt->data, bus->rxhdr, BRCMF_FIRSTREAD);

#ifdef BCMDBG
		if (BRCMF_BYTES_ON() && BRCMF_DATA_ON()) {
			printk(KERN_DEBUG "Rx Data:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
					     pkt->data, len);
		}
#endif

deliver:
		/* Save superframe descriptor and allocate packet frame */
		if (chan == SDPCM_GLOM_CHANNEL) {
			if (SDPCM_GLOMDESC(&bus->rxhdr[SDPCM_FRAMETAG_LEN])) {
				brcmf_dbg(GLOM, "glom descriptor, %d bytes:\n",
					  len);
#ifdef BCMDBG
				if (BRCMF_GLOM_ON()) {
					printk(KERN_DEBUG "Glom Data:\n");
					print_hex_dump_bytes("",
							     DUMP_PREFIX_OFFSET,
							     pkt->data, len);
				}
#endif
				__skb_trim(pkt, len);
				skb_pull(pkt, SDPCM_HDRLEN);
				bus->glomd = pkt;
			} else {
				brcmf_dbg(ERROR, "%s: glom superframe w/o "
					  "descriptor!\n", __func__);
				brcmf_sdbrcm_rxfail(bus, false, false);
			}
			continue;
		}

		/* Fill in packet len and prio, deliver upward */
		__skb_trim(pkt, len);
		skb_pull(pkt, doff);

		if (pkt->len == 0) {
			brcmu_pkt_buf_free_skb(pkt);
			continue;
		} else if (brcmf_proto_hdrpull(bus->drvr, &ifidx, pkt) != 0) {
			brcmf_dbg(ERROR, "rx protocol error\n");
			brcmu_pkt_buf_free_skb(pkt);
			bus->drvr->rx_errors++;
			continue;
		}

		/* Unlock during rx call */
		up(&bus->sdsem);
		brcmf_rx_frame(bus->drvr, ifidx, pkt, 1);
		down(&bus->sdsem);
	}
	rxcount = maxframes - rxleft;
#ifdef BCMDBG
	/* Message if we hit the limit */
	if (!rxleft)
		brcmf_dbg(DATA, "hit rx limit of %d frames\n",
			  maxframes);
	else
#endif				/* BCMDBG */
		brcmf_dbg(DATA, "processed %d frames\n", rxcount);
	/* Back off rxseq if awaiting rtx, update rx_seq */
	if (bus->rxskip)
		rxseq--;
	bus->rx_seq = rxseq;

	return rxcount;
}

static int
brcmf_sdbrcm_send_buf(struct brcmf_bus *bus, u32 addr, uint fn, uint flags,
		    u8 *buf, uint nbytes, struct sk_buff *pkt)
{
	return brcmf_sdcard_send_buf
		(bus->sdiodev, addr, fn, flags, buf, nbytes, pkt);
}

static void
brcmf_sdbrcm_wait_for_event(struct brcmf_bus *bus, bool *lockvar)
{
	up(&bus->sdsem);
	wait_event_interruptible_timeout(bus->ctrl_wait,
					 (*lockvar == false), HZ * 2);
	down(&bus->sdsem);
	return;
}

static void
brcmf_sdbrcm_wait_event_wakeup(struct brcmf_bus *bus)
{
	if (waitqueue_active(&bus->ctrl_wait))
		wake_up_interruptible(&bus->ctrl_wait);
	return;
}

/* Writes a HW/SW header into the packet and sends it. */
/* Assumes: (a) header space already there, (b) caller holds lock */
static int brcmf_sdbrcm_txpkt(struct brcmf_bus *bus, struct sk_buff *pkt,
			      uint chan, bool free_pkt)
{
	int ret;
	u8 *frame;
	u16 len, pad = 0;
	u32 swheader;
	struct sk_buff *new;
	int i;

	brcmf_dbg(TRACE, "Enter\n");

	frame = (u8 *) (pkt->data);

	/* Add alignment padding, allocate new packet if needed */
	pad = ((unsigned long)frame % BRCMF_SDALIGN);
	if (pad) {
		if (skb_headroom(pkt) < pad) {
			brcmf_dbg(INFO, "insufficient headroom %d for %d pad\n",
				  skb_headroom(pkt), pad);
			bus->drvr->tx_realloc++;
			new = brcmu_pkt_buf_get_skb(pkt->len + BRCMF_SDALIGN);
			if (!new) {
				brcmf_dbg(ERROR, "couldn't allocate new %d-byte packet\n",
					  pkt->len + BRCMF_SDALIGN);
				ret = -ENOMEM;
				goto done;
			}

			pkt_align(new, pkt->len, BRCMF_SDALIGN);
			memcpy(new->data, pkt->data, pkt->len);
			if (free_pkt)
				brcmu_pkt_buf_free_skb(pkt);
			/* free the pkt if canned one is not used */
			free_pkt = true;
			pkt = new;
			frame = (u8 *) (pkt->data);
			/* precondition: (frame % BRCMF_SDALIGN) == 0) */
			pad = 0;
		} else {
			skb_push(pkt, pad);
			frame = (u8 *) (pkt->data);
			/* precondition: pad + SDPCM_HDRLEN <= pkt->len */
			memset(frame, 0, pad + SDPCM_HDRLEN);
		}
	}
	/* precondition: pad < BRCMF_SDALIGN */

	/* Hardware tag: 2 byte len followed by 2 byte ~len check (all LE) */
	len = (u16) (pkt->len);
	*(__le16 *) frame = cpu_to_le16(len);
	*(((__le16 *) frame) + 1) = cpu_to_le16(~len);

	/* Software tag: channel, sequence number, data offset */
	swheader =
	    ((chan << SDPCM_CHANNEL_SHIFT) & SDPCM_CHANNEL_MASK) | bus->tx_seq |
	    (((pad +
	       SDPCM_HDRLEN) << SDPCM_DOFFSET_SHIFT) & SDPCM_DOFFSET_MASK);

	put_unaligned_le32(swheader, frame + SDPCM_FRAMETAG_LEN);
	put_unaligned_le32(0, frame + SDPCM_FRAMETAG_LEN + sizeof(swheader));

#ifdef BCMDBG
	tx_packets[pkt->priority]++;
	if (BRCMF_BYTES_ON() &&
	    (((BRCMF_CTL_ON() && (chan == SDPCM_CONTROL_CHANNEL)) ||
	      (BRCMF_DATA_ON() && (chan != SDPCM_CONTROL_CHANNEL))))) {
		printk(KERN_DEBUG "Tx Frame:\n");
		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, frame, len);
	} else if (BRCMF_HDRS_ON()) {
		printk(KERN_DEBUG "TxHdr:\n");
		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
				     frame, min_t(u16, len, 16));
	}
#endif

	/* Raise len to next SDIO block to eliminate tail command */
	if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
		u16 pad = bus->blocksize - (len % bus->blocksize);
		if ((pad <= bus->roundup) && (pad < bus->blocksize))
				len += pad;
	} else if (len % BRCMF_SDALIGN) {
		len += BRCMF_SDALIGN - (len % BRCMF_SDALIGN);
	}

	/* Some controllers have trouble with odd bytes -- round to even */
	if (len & (ALIGNMENT - 1))
			len = roundup(len, ALIGNMENT);

	ret = brcmf_sdbrcm_send_buf(bus, bus->sdiodev->sbwad,
				    SDIO_FUNC_2, F2SYNC, frame,
				    len, pkt);
	bus->f2txdata++;

	if (ret < 0) {
		/* On failure, abort the command and terminate the frame */
		brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
			  ret);
		bus->tx_sderrs++;

		brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				 SBSDIO_FUNC1_FRAMECTRL, SFC_WF_TERM,
				 NULL);
		bus->f1regdata++;

		for (i = 0; i < 3; i++) {
			u8 hi, lo;
			hi = brcmf_sdcard_cfg_read(bus->sdiodev,
					     SDIO_FUNC_1,
					     SBSDIO_FUNC1_WFRAMEBCHI,
					     NULL);
			lo = brcmf_sdcard_cfg_read(bus->sdiodev,
					     SDIO_FUNC_1,
					     SBSDIO_FUNC1_WFRAMEBCLO,
					     NULL);
			bus->f1regdata += 2;
			if ((hi == 0) && (lo == 0))
				break;
		}

	}
	if (ret == 0)
		bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;

done:
	/* restore pkt buffer pointer before calling tx complete routine */
	skb_pull(pkt, SDPCM_HDRLEN + pad);
	up(&bus->sdsem);
	brcmf_txcomplete(bus->drvr, pkt, ret != 0);
	down(&bus->sdsem);

	if (free_pkt)
		brcmu_pkt_buf_free_skb(pkt);

	return ret;
}

static uint brcmf_sdbrcm_sendfromq(struct brcmf_bus *bus, uint maxframes)
{
	struct sk_buff *pkt;
	u32 intstatus = 0;
	uint retries = 0;
	int ret = 0, prec_out;
	uint cnt = 0;
	uint datalen;
	u8 tx_prec_map;

	struct brcmf_pub *drvr = bus->drvr;

	brcmf_dbg(TRACE, "Enter\n");

	tx_prec_map = ~bus->flowcontrol;

	/* Send frames until the limit or some other event */
	for (cnt = 0; (cnt < maxframes) && data_ok(bus); cnt++) {
		spin_lock_bh(&bus->txqlock);
		pkt = brcmu_pktq_mdeq(&bus->txq, tx_prec_map, &prec_out);
		if (pkt == NULL) {
			spin_unlock_bh(&bus->txqlock);
			break;
		}
		spin_unlock_bh(&bus->txqlock);
		datalen = pkt->len - SDPCM_HDRLEN;

		ret = brcmf_sdbrcm_txpkt(bus, pkt, SDPCM_DATA_CHANNEL, true);
		if (ret)
			bus->drvr->tx_errors++;
		else
			bus->drvr->dstats.tx_bytes += datalen;

		/* In poll mode, need to check for other events */
		if (!bus->intr && cnt) {
			/* Check device status, signal pending interrupt */
			r_sdreg32(bus, &intstatus,
				  offsetof(struct sdpcmd_regs, intstatus),
				  &retries);
			bus->f2txdata++;
			if (brcmf_sdcard_regfail(bus->sdiodev))
				break;
			if (intstatus & bus->hostintmask)
				bus->ipend = true;
		}
	}

	/* Deflow-control stack if needed */
	if (drvr->up && (drvr->busstate == BRCMF_BUS_DATA) &&
	    drvr->txoff && (pktq_len(&bus->txq) < TXLOW))
		brcmf_txflowcontrol(drvr, 0, OFF);

	return cnt;
}

static bool brcmf_sdbrcm_dpc(struct brcmf_bus *bus)
{
	u32 intstatus, newstatus = 0;
	uint retries = 0;
	uint rxlimit = bus->rxbound;	/* Rx frames to read before resched */
	uint txlimit = bus->txbound;	/* Tx frames to send before resched */
	uint framecnt = 0;	/* Temporary counter of tx/rx frames */
	bool rxdone = true;	/* Flag for no more read data */
	bool resched = false;	/* Flag indicating resched wanted */

	brcmf_dbg(TRACE, "Enter\n");

	/* Start with leftover status bits */
	intstatus = bus->intstatus;

	down(&bus->sdsem);

	/* If waiting for HTAVAIL, check status */
	if (bus->clkstate == CLK_PENDING) {
		int err;
		u8 clkctl, devctl = 0;

#ifdef BCMDBG
		/* Check for inconsistent device control */
		devctl = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					       SBSDIO_DEVICE_CTL, &err);
		if (err) {
			brcmf_dbg(ERROR, "error reading DEVCTL: %d\n", err);
			bus->drvr->busstate = BRCMF_BUS_DOWN;
		}
#endif				/* BCMDBG */

		/* Read CSR, if clock on switch to AVAIL, else ignore */
		clkctl = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					       SBSDIO_FUNC1_CHIPCLKCSR, &err);
		if (err) {
			brcmf_dbg(ERROR, "error reading CSR: %d\n",
				  err);
			bus->drvr->busstate = BRCMF_BUS_DOWN;
		}

		brcmf_dbg(INFO, "DPC: PENDING, devctl 0x%02x clkctl 0x%02x\n",
			  devctl, clkctl);

		if (SBSDIO_HTAV(clkctl)) {
			devctl = brcmf_sdcard_cfg_read(bus->sdiodev,
						       SDIO_FUNC_1,
						       SBSDIO_DEVICE_CTL, &err);
			if (err) {
				brcmf_dbg(ERROR, "error reading DEVCTL: %d\n",
					  err);
				bus->drvr->busstate = BRCMF_BUS_DOWN;
			}
			devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				SBSDIO_DEVICE_CTL, devctl, &err);
			if (err) {
				brcmf_dbg(ERROR, "error writing DEVCTL: %d\n",
					  err);
				bus->drvr->busstate = BRCMF_BUS_DOWN;
			}
			bus->clkstate = CLK_AVAIL;
		} else {
			goto clkwait;
		}
	}

	bus_wake(bus);

	/* Make sure backplane clock is on */
	brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, true);
	if (bus->clkstate == CLK_PENDING)
		goto clkwait;

	/* Pending interrupt indicates new device status */
	if (bus->ipend) {
		bus->ipend = false;
		r_sdreg32(bus, &newstatus,
			  offsetof(struct sdpcmd_regs, intstatus), &retries);
		bus->f1regdata++;
		if (brcmf_sdcard_regfail(bus->sdiodev))
			newstatus = 0;
		newstatus &= bus->hostintmask;
		bus->fcstate = !!(newstatus & I_HMB_FC_STATE);
		if (newstatus) {
			w_sdreg32(bus, newstatus,
				  offsetof(struct sdpcmd_regs, intstatus),
				  &retries);
			bus->f1regdata++;
		}
	}

	/* Merge new bits with previous */
	intstatus |= newstatus;
	bus->intstatus = 0;

	/* Handle flow-control change: read new state in case our ack
	 * crossed another change interrupt.  If change still set, assume
	 * FC ON for safety, let next loop through do the debounce.
	 */
	if (intstatus & I_HMB_FC_CHANGE) {
		intstatus &= ~I_HMB_FC_CHANGE;
		w_sdreg32(bus, I_HMB_FC_CHANGE,
			  offsetof(struct sdpcmd_regs, intstatus), &retries);

		r_sdreg32(bus, &newstatus,
			  offsetof(struct sdpcmd_regs, intstatus), &retries);
		bus->f1regdata += 2;
		bus->fcstate =
		    !!(newstatus & (I_HMB_FC_STATE | I_HMB_FC_CHANGE));
		intstatus |= (newstatus & bus->hostintmask);
	}

	/* Handle host mailbox indication */
	if (intstatus & I_HMB_HOST_INT) {
		intstatus &= ~I_HMB_HOST_INT;
		intstatus |= brcmf_sdbrcm_hostmail(bus);
	}

	/* Generally don't ask for these, can get CRC errors... */
	if (intstatus & I_WR_OOSYNC) {
		brcmf_dbg(ERROR, "Dongle reports WR_OOSYNC\n");
		intstatus &= ~I_WR_OOSYNC;
	}

	if (intstatus & I_RD_OOSYNC) {
		brcmf_dbg(ERROR, "Dongle reports RD_OOSYNC\n");
		intstatus &= ~I_RD_OOSYNC;
	}

	if (intstatus & I_SBINT) {
		brcmf_dbg(ERROR, "Dongle reports SBINT\n");
		intstatus &= ~I_SBINT;
	}

	/* Would be active due to wake-wlan in gSPI */
	if (intstatus & I_CHIPACTIVE) {
		brcmf_dbg(INFO, "Dongle reports CHIPACTIVE\n");
		intstatus &= ~I_CHIPACTIVE;
	}

	/* Ignore frame indications if rxskip is set */
	if (bus->rxskip)
		intstatus &= ~I_HMB_FRAME_IND;

	/* On frame indication, read available frames */
	if (PKT_AVAILABLE()) {
		framecnt = brcmf_sdbrcm_readframes(bus, rxlimit, &rxdone);
		if (rxdone || bus->rxskip)
			intstatus &= ~I_HMB_FRAME_IND;
		rxlimit -= min(framecnt, rxlimit);
	}

	/* Keep still-pending events for next scheduling */
	bus->intstatus = intstatus;

clkwait:
	if (data_ok(bus) && bus->ctrl_frame_stat &&
		(bus->clkstate == CLK_AVAIL)) {
		int ret, i;

		ret = brcmf_sdbrcm_send_buf(bus, bus->sdiodev->sbwad,
			SDIO_FUNC_2, F2SYNC, (u8 *) bus->ctrl_frame_buf,
			(u32) bus->ctrl_frame_len, NULL);

		if (ret < 0) {
			/* On failure, abort the command and
				terminate the frame */
			brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
				  ret);
			bus->tx_sderrs++;

			brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);

			brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
					 SBSDIO_FUNC1_FRAMECTRL, SFC_WF_TERM,
					 NULL);
			bus->f1regdata++;

			for (i = 0; i < 3; i++) {
				u8 hi, lo;
				hi = brcmf_sdcard_cfg_read(bus->sdiodev,
						     SDIO_FUNC_1,
						     SBSDIO_FUNC1_WFRAMEBCHI,
						     NULL);
				lo = brcmf_sdcard_cfg_read(bus->sdiodev,
						     SDIO_FUNC_1,
						     SBSDIO_FUNC1_WFRAMEBCLO,
						     NULL);
				bus->f1regdata += 2;
				if ((hi == 0) && (lo == 0))
					break;
			}

		}
		if (ret == 0)
			bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;

		brcmf_dbg(INFO, "Return_dpc value is : %d\n", ret);
		bus->ctrl_frame_stat = false;
		brcmf_sdbrcm_wait_event_wakeup(bus);
	}
	/* Send queued frames (limit 1 if rx may still be pending) */
	else if ((bus->clkstate == CLK_AVAIL) && !bus->fcstate &&
		 brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) && txlimit
		 && data_ok(bus)) {
		framecnt = rxdone ? txlimit : min(txlimit, bus->txminmax);
		framecnt = brcmf_sdbrcm_sendfromq(bus, framecnt);
		txlimit -= framecnt;
	}

	/* Resched if events or tx frames are pending,
		 else await next interrupt */
	/* On failed register access, all bets are off:
		 no resched or interrupts */
	if ((bus->drvr->busstate == BRCMF_BUS_DOWN) ||
	    brcmf_sdcard_regfail(bus->sdiodev)) {
		brcmf_dbg(ERROR, "failed backplane access over SDIO, halting operation %d\n",
			  brcmf_sdcard_regfail(bus->sdiodev));
		bus->drvr->busstate = BRCMF_BUS_DOWN;
		bus->intstatus = 0;
	} else if (bus->clkstate == CLK_PENDING) {
		brcmf_dbg(INFO, "rescheduled due to CLK_PENDING awaiting I_CHIPACTIVE interrupt\n");
		resched = true;
	} else if (bus->intstatus || bus->ipend ||
		(!bus->fcstate && brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol)
		 && data_ok(bus)) || PKT_AVAILABLE()) {
		resched = true;
	}

	bus->dpc_sched = resched;

	/* If we're done for now, turn off clock request. */
	if ((bus->clkstate != CLK_PENDING)
	    && bus->idletime == BRCMF_IDLE_IMMEDIATE) {
		bus->activity = false;
		brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
	}

	up(&bus->sdsem);

	return resched;
}

static int brcmf_sdbrcm_dpc_thread(void *data)
{
	struct brcmf_bus *bus = (struct brcmf_bus *) data;

	allow_signal(SIGTERM);
	/* Run until signal received */
	while (1) {
		if (kthread_should_stop())
			break;
		if (!wait_for_completion_interruptible(&bus->dpc_wait)) {
			/* Call bus dpc unless it indicated down
			(then clean stop) */
			if (bus->drvr->busstate != BRCMF_BUS_DOWN) {
				if (brcmf_sdbrcm_dpc(bus))
					complete(&bus->dpc_wait);
			} else {
				/* after stopping the bus, exit thread */
				brcmf_sdbrcm_bus_stop(bus);
				bus->dpc_tsk = NULL;
				break;
			}
		} else
			break;
	}
	return 0;
}

int brcmf_sdbrcm_bus_txdata(struct brcmf_bus *bus, struct sk_buff *pkt)
{
	int ret = -EBADE;
	uint datalen, prec;

	brcmf_dbg(TRACE, "Enter\n");

	datalen = pkt->len;

	/* Add space for the header */
	skb_push(pkt, SDPCM_HDRLEN);
	/* precondition: IS_ALIGNED((unsigned long)(pkt->data), 2) */

	prec = prio2prec((pkt->priority & PRIOMASK));

	/* Check for existing queue, current flow-control,
			 pending event, or pending clock */
	brcmf_dbg(TRACE, "deferring pktq len %d\n", pktq_len(&bus->txq));
	bus->fcqueued++;

	/* Priority based enq */
	spin_lock_bh(&bus->txqlock);
	if (brcmf_c_prec_enq(bus->drvr, &bus->txq, pkt, prec) == false) {
		skb_pull(pkt, SDPCM_HDRLEN);
		brcmf_txcomplete(bus->drvr, pkt, false);
		brcmu_pkt_buf_free_skb(pkt);
		brcmf_dbg(ERROR, "out of bus->txq !!!\n");
		ret = -ENOSR;
	} else {
		ret = 0;
	}
	spin_unlock_bh(&bus->txqlock);

	if (pktq_len(&bus->txq) >= TXHI)
		brcmf_txflowcontrol(bus->drvr, 0, ON);

#ifdef BCMDBG
	if (pktq_plen(&bus->txq, prec) > qcount[prec])
		qcount[prec] = pktq_plen(&bus->txq, prec);
#endif
	/* Schedule DPC if needed to send queued packet(s) */
	if (!bus->dpc_sched) {
		bus->dpc_sched = true;
		if (bus->dpc_tsk)
			complete(&bus->dpc_wait);
	}

	return ret;
}

static int
brcmf_sdbrcm_membytes(struct brcmf_bus *bus, bool write, u32 address, u8 *data,
		 uint size)
{
	int bcmerror = 0;
	u32 sdaddr;
	uint dsize;

	/* Determine initial transfer parameters */
	sdaddr = address & SBSDIO_SB_OFT_ADDR_MASK;
	if ((sdaddr + size) & SBSDIO_SBWINDOW_MASK)
		dsize = (SBSDIO_SB_OFT_ADDR_LIMIT - sdaddr);
	else
		dsize = size;

	/* Set the backplane window to include the start address */
	bcmerror = brcmf_sdcard_set_sbaddr_window(bus->sdiodev, address);
	if (bcmerror) {
		brcmf_dbg(ERROR, "window change failed\n");
		goto xfer_done;
	}

	/* Do the transfer(s) */
	while (size) {
		brcmf_dbg(INFO, "%s %d bytes at offset 0x%08x in window 0x%08x\n",
			  write ? "write" : "read", dsize,
			  sdaddr, address & SBSDIO_SBWINDOW_MASK);
		bcmerror = brcmf_sdcard_rwdata(bus->sdiodev, write,
					       sdaddr, data, dsize);
		if (bcmerror) {
			brcmf_dbg(ERROR, "membytes transfer failed\n");
			break;
		}

		/* Adjust for next transfer (if any) */
		size -= dsize;
		if (size) {
			data += dsize;
			address += dsize;
			bcmerror = brcmf_sdcard_set_sbaddr_window(bus->sdiodev,
								  address);
			if (bcmerror) {
				brcmf_dbg(ERROR, "window change failed\n");
				break;
			}
			sdaddr = 0;
			dsize = min_t(uint, SBSDIO_SB_OFT_ADDR_LIMIT, size);
		}
	}

xfer_done:
	/* Return the window to backplane enumeration space for core access */
	if (brcmf_sdcard_set_sbaddr_window(bus->sdiodev, bus->sdiodev->sbwad))
		brcmf_dbg(ERROR, "FAILED to set window back to 0x%x\n",
			  bus->sdiodev->sbwad);

	return bcmerror;
}

#ifdef BCMDBG
#define CONSOLE_LINE_MAX	192

static int brcmf_sdbrcm_readconsole(struct brcmf_bus *bus)
{
	struct brcmf_console *c = &bus->console;
	u8 line[CONSOLE_LINE_MAX], ch;
	u32 n, idx, addr;
	int rv;

	/* Don't do anything until FWREADY updates console address */
	if (bus->console_addr == 0)
		return 0;

	/* Read console log struct */
	addr = bus->console_addr + offsetof(struct rte_console, log_le);
	rv = brcmf_sdbrcm_membytes(bus, false, addr, (u8 *)&c->log_le,
				   sizeof(c->log_le));
	if (rv < 0)
		return rv;

	/* Allocate console buffer (one time only) */
	if (c->buf == NULL) {
		c->bufsize = le32_to_cpu(c->log_le.buf_size);
		c->buf = kmalloc(c->bufsize, GFP_ATOMIC);
		if (c->buf == NULL)
			return -ENOMEM;
	}

	idx = le32_to_cpu(c->log_le.idx);

	/* Protect against corrupt value */
	if (idx > c->bufsize)
		return -EBADE;

	/* Skip reading the console buffer if the index pointer
	 has not moved */
	if (idx == c->last)
		return 0;

	/* Read the console buffer */
	addr = le32_to_cpu(c->log_le.buf);
	rv = brcmf_sdbrcm_membytes(bus, false, addr, c->buf, c->bufsize);
	if (rv < 0)
		return rv;

	while (c->last != idx) {
		for (n = 0; n < CONSOLE_LINE_MAX - 2; n++) {
			if (c->last == idx) {
				/* This would output a partial line.
				 * Instead, back up
				 * the buffer pointer and output this
				 * line next time around.
				 */
				if (c->last >= n)
					c->last -= n;
				else
					c->last = c->bufsize - n;
				goto break2;
			}
			ch = c->buf[c->last];
			c->last = (c->last + 1) % c->bufsize;
			if (ch == '\n')
				break;
			line[n] = ch;
		}

		if (n > 0) {
			if (line[n - 1] == '\r')
				n--;
			line[n] = 0;
			printk(KERN_DEBUG "CONSOLE: %s\n", line);
		}
	}
break2:

	return 0;
}
#endif				/* BCMDBG */

static int brcmf_tx_frame(struct brcmf_bus *bus, u8 *frame, u16 len)
{
	int i;
	int ret;

	bus->ctrl_frame_stat = false;
	ret = brcmf_sdbrcm_send_buf(bus, bus->sdiodev->sbwad,
				    SDIO_FUNC_2, F2SYNC, frame, len, NULL);

	if (ret < 0) {
		/* On failure, abort the command and terminate the frame */
		brcmf_dbg(INFO, "sdio error %d, abort command and terminate frame\n",
			  ret);
		bus->tx_sderrs++;

		brcmf_sdcard_abort(bus->sdiodev, SDIO_FUNC_2);

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				       SBSDIO_FUNC1_FRAMECTRL,
				       SFC_WF_TERM, NULL);
		bus->f1regdata++;

		for (i = 0; i < 3; i++) {
			u8 hi, lo;
			hi = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
						   SBSDIO_FUNC1_WFRAMEBCHI,
						   NULL);
			lo = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
						   SBSDIO_FUNC1_WFRAMEBCLO,
						   NULL);
			bus->f1regdata += 2;
			if (hi == 0 && lo == 0)
				break;
		}
		return ret;
	}

	bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQUENCE_WRAP;

	return ret;
}

int
brcmf_sdbrcm_bus_txctl(struct brcmf_bus *bus, unsigned char *msg, uint msglen)
{
	u8 *frame;
	u16 len;
	u32 swheader;
	uint retries = 0;
	u8 doff = 0;
	int ret = -1;

	brcmf_dbg(TRACE, "Enter\n");

	/* Back the pointer to make a room for bus header */
	frame = msg - SDPCM_HDRLEN;
	len = (msglen += SDPCM_HDRLEN);

	/* Add alignment padding (optional for ctl frames) */
	doff = ((unsigned long)frame % BRCMF_SDALIGN);
	if (doff) {
		frame -= doff;
		len += doff;
		msglen += doff;
		memset(frame, 0, doff + SDPCM_HDRLEN);
	}
	/* precondition: doff < BRCMF_SDALIGN */
	doff += SDPCM_HDRLEN;

	/* Round send length to next SDIO block */
	if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
		u16 pad = bus->blocksize - (len % bus->blocksize);
		if ((pad <= bus->roundup) && (pad < bus->blocksize))
			len += pad;
	} else if (len % BRCMF_SDALIGN) {
		len += BRCMF_SDALIGN - (len % BRCMF_SDALIGN);
	}

	/* Satisfy length-alignment requirements */
	if (len & (ALIGNMENT - 1))
		len = roundup(len, ALIGNMENT);

	/* precondition: IS_ALIGNED((unsigned long)frame, 2) */

	/* Need to lock here to protect txseq and SDIO tx calls */
	down(&bus->sdsem);

	bus_wake(bus);

	/* Make sure backplane clock is on */
	brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

	/* Hardware tag: 2 byte len followed by 2 byte ~len check (all LE) */
	*(__le16 *) frame = cpu_to_le16((u16) msglen);
	*(((__le16 *) frame) + 1) = cpu_to_le16(~msglen);

	/* Software tag: channel, sequence number, data offset */
	swheader =
	    ((SDPCM_CONTROL_CHANNEL << SDPCM_CHANNEL_SHIFT) &
	     SDPCM_CHANNEL_MASK)
	    | bus->tx_seq | ((doff << SDPCM_DOFFSET_SHIFT) &
			     SDPCM_DOFFSET_MASK);
	put_unaligned_le32(swheader, frame + SDPCM_FRAMETAG_LEN);
	put_unaligned_le32(0, frame + SDPCM_FRAMETAG_LEN + sizeof(swheader));

	if (!data_ok(bus)) {
		brcmf_dbg(INFO, "No bus credit bus->tx_max %d, bus->tx_seq %d\n",
			  bus->tx_max, bus->tx_seq);
		bus->ctrl_frame_stat = true;
		/* Send from dpc */
		bus->ctrl_frame_buf = frame;
		bus->ctrl_frame_len = len;

		brcmf_sdbrcm_wait_for_event(bus, &bus->ctrl_frame_stat);

		if (bus->ctrl_frame_stat == false) {
			brcmf_dbg(INFO, "ctrl_frame_stat == false\n");
			ret = 0;
		} else {
			brcmf_dbg(INFO, "ctrl_frame_stat == true\n");
			ret = -1;
		}
	}

	if (ret == -1) {
#ifdef BCMDBG
		if (BRCMF_BYTES_ON() && BRCMF_CTL_ON()) {
			printk(KERN_DEBUG "Tx Frame:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
					     frame, len);
		} else if (BRCMF_HDRS_ON()) {
			printk(KERN_DEBUG "TxHdr:\n");
			print_hex_dump_bytes("", DUMP_PREFIX_OFFSET,
					     frame, min_t(u16, len, 16));
		}
#endif

		do {
			ret = brcmf_tx_frame(bus, frame, len);
		} while (ret < 0 && retries++ < TXRETRIES);
	}

	if ((bus->idletime == BRCMF_IDLE_IMMEDIATE) && !bus->dpc_sched) {
		bus->activity = false;
		brcmf_sdbrcm_clkctl(bus, CLK_NONE, true);
	}

	up(&bus->sdsem);

	if (ret)
		bus->drvr->tx_ctlerrs++;
	else
		bus->drvr->tx_ctlpkts++;

	return ret ? -EIO : 0;
}

int
brcmf_sdbrcm_bus_rxctl(struct brcmf_bus *bus, unsigned char *msg, uint msglen)
{
	int timeleft;
	uint rxlen = 0;
	bool pending;

	brcmf_dbg(TRACE, "Enter\n");

	/* Wait until control frame is available */
	timeleft = brcmf_sdbrcm_dcmd_resp_wait(bus, &bus->rxlen, &pending);

	down(&bus->sdsem);
	rxlen = bus->rxlen;
	memcpy(msg, bus->rxctl, min(msglen, rxlen));
	bus->rxlen = 0;
	up(&bus->sdsem);

	if (rxlen) {
		brcmf_dbg(CTL, "resumed on rxctl frame, got %d expected %d\n",
			  rxlen, msglen);
	} else if (timeleft == 0) {
		brcmf_dbg(ERROR, "resumed on timeout\n");
	} else if (pending == true) {
		brcmf_dbg(CTL, "cancelled\n");
		return -ERESTARTSYS;
	} else {
		brcmf_dbg(CTL, "resumed for unknown reason?\n");
	}

	if (rxlen)
		bus->drvr->rx_ctlpkts++;
	else
		bus->drvr->rx_ctlerrs++;

	return rxlen ? (int)rxlen : -ETIMEDOUT;
}

static int brcmf_sdbrcm_downloadvars(struct brcmf_bus *bus, void *arg, int len)
{
	int bcmerror = 0;

	brcmf_dbg(TRACE, "Enter\n");

	/* Basic sanity checks */
	if (bus->drvr->up) {
		bcmerror = -EISCONN;
		goto err;
	}
	if (!len) {
		bcmerror = -EOVERFLOW;
		goto err;
	}

	/* Free the old ones and replace with passed variables */
	kfree(bus->vars);

	bus->vars = kmalloc(len, GFP_ATOMIC);
	bus->varsz = bus->vars ? len : 0;
	if (bus->vars == NULL) {
		bcmerror = -ENOMEM;
		goto err;
	}

	/* Copy the passed variables, which should include the
		 terminating double-null */
	memcpy(bus->vars, arg, bus->varsz);
err:
	return bcmerror;
}

static int brcmf_sdbrcm_write_vars(struct brcmf_bus *bus)
{
	int bcmerror = 0;
	u32 varsize;
	u32 varaddr;
	u8 *vbuffer;
	u32 varsizew;
	__le32 varsizew_le;
#ifdef BCMDBG
	char *nvram_ularray;
#endif				/* BCMDBG */

	/* Even if there are no vars are to be written, we still
		 need to set the ramsize. */
	varsize = bus->varsz ? roundup(bus->varsz, 4) : 0;
	varaddr = (bus->ramsize - 4) - varsize;

	if (bus->vars) {
		vbuffer = kzalloc(varsize, GFP_ATOMIC);
		if (!vbuffer)
			return -ENOMEM;

		memcpy(vbuffer, bus->vars, bus->varsz);

		/* Write the vars list */
		bcmerror =
		    brcmf_sdbrcm_membytes(bus, true, varaddr, vbuffer, varsize);
#ifdef BCMDBG
		/* Verify NVRAM bytes */
		brcmf_dbg(INFO, "Compare NVRAM dl & ul; varsize=%d\n", varsize);
		nvram_ularray = kmalloc(varsize, GFP_ATOMIC);
		if (!nvram_ularray)
			return -ENOMEM;

		/* Upload image to verify downloaded contents. */
		memset(nvram_ularray, 0xaa, varsize);

		/* Read the vars list to temp buffer for comparison */
		bcmerror =
		    brcmf_sdbrcm_membytes(bus, false, varaddr, nvram_ularray,
				     varsize);
		if (bcmerror) {
			brcmf_dbg(ERROR, "error %d on reading %d nvram bytes at 0x%08x\n",
				  bcmerror, varsize, varaddr);
		}
		/* Compare the org NVRAM with the one read from RAM */
		if (memcmp(vbuffer, nvram_ularray, varsize))
			brcmf_dbg(ERROR, "Downloaded NVRAM image is corrupted\n");
		else
			brcmf_dbg(ERROR, "Download/Upload/Compare of NVRAM ok\n");

		kfree(nvram_ularray);
#endif				/* BCMDBG */

		kfree(vbuffer);
	}

	/* adjust to the user specified RAM */
	brcmf_dbg(INFO, "Physical memory size: %d\n", bus->ramsize);
	brcmf_dbg(INFO, "Vars are at %d, orig varsize is %d\n",
		  varaddr, varsize);
	varsize = ((bus->ramsize - 4) - varaddr);

	/*
	 * Determine the length token:
	 * Varsize, converted to words, in lower 16-bits, checksum
	 * in upper 16-bits.
	 */
	if (bcmerror) {
		varsizew = 0;
		varsizew_le = cpu_to_le32(0);
	} else {
		varsizew = varsize / 4;
		varsizew = (~varsizew << 16) | (varsizew & 0x0000FFFF);
		varsizew_le = cpu_to_le32(varsizew);
	}

	brcmf_dbg(INFO, "New varsize is %d, length token=0x%08x\n",
		  varsize, varsizew);

	/* Write the length token to the last word */
	bcmerror = brcmf_sdbrcm_membytes(bus, true, (bus->ramsize - 4),
					 (u8 *)&varsizew_le, 4);

	return bcmerror;
}

static int brcmf_sdbrcm_download_state(struct brcmf_bus *bus, bool enter)
{
	uint retries;
	int bcmerror = 0;
	struct chip_info *ci = bus->ci;

	/* To enter download state, disable ARM and reset SOCRAM.
	 * To exit download state, simply reset ARM (default is RAM boot).
	 */
	if (enter) {
		bus->alp_only = true;

		ci->coredisable(bus->sdiodev, ci, BCMA_CORE_ARM_CM3);

		ci->resetcore(bus->sdiodev, ci, BCMA_CORE_INTERNAL_MEM);

		/* Clear the top bit of memory */
		if (bus->ramsize) {
			u32 zeros = 0;
			brcmf_sdbrcm_membytes(bus, true, bus->ramsize - 4,
					 (u8 *)&zeros, 4);
		}
	} else {
		if (!ci->iscoreup(bus->sdiodev, ci, BCMA_CORE_INTERNAL_MEM)) {
			brcmf_dbg(ERROR, "SOCRAM core is down after reset?\n");
			bcmerror = -EBADE;
			goto fail;
		}

		bcmerror = brcmf_sdbrcm_write_vars(bus);
		if (bcmerror) {
			brcmf_dbg(ERROR, "no vars written to RAM\n");
			bcmerror = 0;
		}

		w_sdreg32(bus, 0xFFFFFFFF,
			  offsetof(struct sdpcmd_regs, intstatus), &retries);

		ci->resetcore(bus->sdiodev, ci, BCMA_CORE_ARM_CM3);

		/* Allow HT Clock now that the ARM is running. */
		bus->alp_only = false;

		bus->drvr->busstate = BRCMF_BUS_LOAD;
	}
fail:
	return bcmerror;
}

static int brcmf_sdbrcm_get_image(char *buf, int len, struct brcmf_bus *bus)
{
	if (bus->firmware->size < bus->fw_ptr + len)
		len = bus->firmware->size - bus->fw_ptr;

	memcpy(buf, &bus->firmware->data[bus->fw_ptr], len);
	bus->fw_ptr += len;
	return len;
}

MODULE_FIRMWARE(BCM4329_FW_NAME);
MODULE_FIRMWARE(BCM4329_NV_NAME);

static int brcmf_sdbrcm_download_code_file(struct brcmf_bus *bus)
{
	int offset = 0;
	uint len;
	u8 *memblock = NULL, *memptr;
	int ret;

	brcmf_dbg(INFO, "Enter\n");

	bus->fw_name = BCM4329_FW_NAME;
	ret = request_firmware(&bus->firmware, bus->fw_name,
			       &bus->sdiodev->func[2]->dev);
	if (ret) {
		brcmf_dbg(ERROR, "Fail to request firmware %d\n", ret);
		return ret;
	}
	bus->fw_ptr = 0;

	memptr = memblock = kmalloc(MEMBLOCK + BRCMF_SDALIGN, GFP_ATOMIC);
	if (memblock == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	if ((u32)(unsigned long)memblock % BRCMF_SDALIGN)
		memptr += (BRCMF_SDALIGN -
			   ((u32)(unsigned long)memblock % BRCMF_SDALIGN));

	/* Download image */
	while ((len =
		brcmf_sdbrcm_get_image((char *)memptr, MEMBLOCK, bus))) {
		ret = brcmf_sdbrcm_membytes(bus, true, offset, memptr, len);
		if (ret) {
			brcmf_dbg(ERROR, "error %d on writing %d membytes at 0x%08x\n",
				  ret, MEMBLOCK, offset);
			goto err;
		}

		offset += MEMBLOCK;
	}

err:
	kfree(memblock);

	release_firmware(bus->firmware);
	bus->fw_ptr = 0;

	return ret;
}

/*
 * ProcessVars:Takes a buffer of "<var>=<value>\n" lines read from a file
 * and ending in a NUL.
 * Removes carriage returns, empty lines, comment lines, and converts
 * newlines to NULs.
 * Shortens buffer as needed and pads with NULs.  End of buffer is marked
 * by two NULs.
*/

static uint brcmf_process_nvram_vars(char *varbuf, uint len)
{
	char *dp;
	bool findNewline;
	int column;
	uint buf_len, n;

	dp = varbuf;

	findNewline = false;
	column = 0;

	for (n = 0; n < len; n++) {
		if (varbuf[n] == 0)
			break;
		if (varbuf[n] == '\r')
			continue;
		if (findNewline && varbuf[n] != '\n')
			continue;
		findNewline = false;
		if (varbuf[n] == '#') {
			findNewline = true;
			continue;
		}
		if (varbuf[n] == '\n') {
			if (column == 0)
				continue;
			*dp++ = 0;
			column = 0;
			continue;
		}
		*dp++ = varbuf[n];
		column++;
	}
	buf_len = dp - varbuf;

	while (dp < varbuf + n)
		*dp++ = 0;

	return buf_len;
}

static int brcmf_sdbrcm_download_nvram(struct brcmf_bus *bus)
{
	uint len;
	char *memblock = NULL;
	char *bufp;
	int ret;

	bus->nv_name = BCM4329_NV_NAME;
	ret = request_firmware(&bus->firmware, bus->nv_name,
			       &bus->sdiodev->func[2]->dev);
	if (ret) {
		brcmf_dbg(ERROR, "Fail to request nvram %d\n", ret);
		return ret;
	}
	bus->fw_ptr = 0;

	memblock = kmalloc(MEMBLOCK, GFP_ATOMIC);
	if (memblock == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	len = brcmf_sdbrcm_get_image(memblock, MEMBLOCK, bus);

	if (len > 0 && len < MEMBLOCK) {
		bufp = (char *)memblock;
		bufp[len] = 0;
		len = brcmf_process_nvram_vars(bufp, len);
		bufp += len;
		*bufp++ = 0;
		if (len)
			ret = brcmf_sdbrcm_downloadvars(bus, memblock, len + 1);
		if (ret)
			brcmf_dbg(ERROR, "error downloading vars: %d\n", ret);
	} else {
		brcmf_dbg(ERROR, "error reading nvram file: %d\n", len);
		ret = -EIO;
	}

err:
	kfree(memblock);

	release_firmware(bus->firmware);
	bus->fw_ptr = 0;

	return ret;
}

static int _brcmf_sdbrcm_download_firmware(struct brcmf_bus *bus)
{
	int bcmerror = -1;

	/* Keep arm in reset */
	if (brcmf_sdbrcm_download_state(bus, true)) {
		brcmf_dbg(ERROR, "error placing ARM core in reset\n");
		goto err;
	}

	/* External image takes precedence if specified */
	if (brcmf_sdbrcm_download_code_file(bus)) {
		brcmf_dbg(ERROR, "dongle image file download failed\n");
		goto err;
	}

	/* External nvram takes precedence if specified */
	if (brcmf_sdbrcm_download_nvram(bus))
		brcmf_dbg(ERROR, "dongle nvram file download failed\n");

	/* Take arm out of reset */
	if (brcmf_sdbrcm_download_state(bus, false)) {
		brcmf_dbg(ERROR, "error getting out of ARM core reset\n");
		goto err;
	}

	bcmerror = 0;

err:
	return bcmerror;
}

static bool
brcmf_sdbrcm_download_firmware(struct brcmf_bus *bus)
{
	bool ret;

	/* Download the firmware */
	brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

	ret = _brcmf_sdbrcm_download_firmware(bus) == 0;

	brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

	return ret;
}

void brcmf_sdbrcm_bus_stop(struct brcmf_bus *bus)
{
	u32 local_hostintmask;
	u8 saveclk;
	uint retries;
	int err;

	brcmf_dbg(TRACE, "Enter\n");

	if (bus->watchdog_tsk) {
		send_sig(SIGTERM, bus->watchdog_tsk, 1);
		kthread_stop(bus->watchdog_tsk);
		bus->watchdog_tsk = NULL;
	}

	if (bus->dpc_tsk && bus->dpc_tsk != current) {
		send_sig(SIGTERM, bus->dpc_tsk, 1);
		kthread_stop(bus->dpc_tsk);
		bus->dpc_tsk = NULL;
	}

	down(&bus->sdsem);

	bus_wake(bus);

	/* Enable clock for device interrupts */
	brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);

	/* Disable and clear interrupts at the chip level also */
	w_sdreg32(bus, 0, offsetof(struct sdpcmd_regs, hostintmask), &retries);
	local_hostintmask = bus->hostintmask;
	bus->hostintmask = 0;

	/* Change our idea of bus state */
	bus->drvr->busstate = BRCMF_BUS_DOWN;

	/* Force clocks on backplane to be sure F2 interrupt propagates */
	saveclk = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					SBSDIO_FUNC1_CHIPCLKCSR, &err);
	if (!err) {
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				       SBSDIO_FUNC1_CHIPCLKCSR,
				       (saveclk | SBSDIO_FORCE_HT), &err);
	}
	if (err)
		brcmf_dbg(ERROR, "Failed to force clock for F2: err %d\n", err);

	/* Turn off the bus (F2), free any pending packets */
	brcmf_dbg(INTR, "disable SDIO interrupts\n");
	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_0, SDIO_CCCR_IOEx,
			 SDIO_FUNC_ENABLE_1, NULL);

	/* Clear any pending interrupts now that F2 is disabled */
	w_sdreg32(bus, local_hostintmask,
		  offsetof(struct sdpcmd_regs, intstatus), &retries);

	/* Turn off the backplane clock (only) */
	brcmf_sdbrcm_clkctl(bus, CLK_SDONLY, false);

	/* Clear the data packet queues */
	brcmu_pktq_flush(&bus->txq, true, NULL, NULL);

	/* Clear any held glomming stuff */
	if (bus->glomd)
		brcmu_pkt_buf_free_skb(bus->glomd);
	brcmf_sdbrcm_free_glom(bus);

	/* Clear rx control and wake any waiters */
	bus->rxlen = 0;
	brcmf_sdbrcm_dcmd_resp_wake(bus);

	/* Reset some F2 state stuff */
	bus->rxskip = false;
	bus->tx_seq = bus->rx_seq = 0;

	up(&bus->sdsem);
}

int brcmf_sdbrcm_bus_init(struct brcmf_pub *drvr)
{
	struct brcmf_bus *bus = drvr->bus;
	unsigned long timeout;
	uint retries = 0;
	u8 ready, enable;
	int err, ret = 0;
	u8 saveclk;

	brcmf_dbg(TRACE, "Enter\n");

	/* try to download image and nvram to the dongle */
	if (drvr->busstate == BRCMF_BUS_DOWN) {
		if (!(brcmf_sdbrcm_download_firmware(bus)))
			return -1;
	}

	if (!bus->drvr)
		return 0;

	/* Start the watchdog timer */
	bus->drvr->tickcnt = 0;
	brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);

	down(&bus->sdsem);

	/* Make sure backplane clock is on, needed to generate F2 interrupt */
	brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
	if (bus->clkstate != CLK_AVAIL)
		goto exit;

	/* Force clocks on backplane to be sure F2 interrupt propagates */
	saveclk =
	    brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
				  SBSDIO_FUNC1_CHIPCLKCSR, &err);
	if (!err) {
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				       SBSDIO_FUNC1_CHIPCLKCSR,
				       (saveclk | SBSDIO_FORCE_HT), &err);
	}
	if (err) {
		brcmf_dbg(ERROR, "Failed to force clock for F2: err %d\n", err);
		goto exit;
	}

	/* Enable function 2 (frame transfers) */
	w_sdreg32(bus, SDPCM_PROT_VERSION << SMB_DATA_VERSION_SHIFT,
		  offsetof(struct sdpcmd_regs, tosbmailboxdata), &retries);
	enable = (SDIO_FUNC_ENABLE_1 | SDIO_FUNC_ENABLE_2);

	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_0, SDIO_CCCR_IOEx,
			       enable, NULL);

	timeout = jiffies + msecs_to_jiffies(BRCMF_WAIT_F2RDY);
	ready = 0;
	while (enable != ready) {
		ready = brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_0,
					      SDIO_CCCR_IORx, NULL);
		if (time_after(jiffies, timeout))
			break;
		else if (time_after(jiffies, timeout - BRCMF_WAIT_F2RDY + 50))
			/* prevent busy waiting if it takes too long */
			msleep_interruptible(20);
	}

	brcmf_dbg(INFO, "enable 0x%02x, ready 0x%02x\n", enable, ready);

	/* If F2 successfully enabled, set core and enable interrupts */
	if (ready == enable) {
		/* Set up the interrupt mask and enable interrupts */
		bus->hostintmask = HOSTINTMASK;
		w_sdreg32(bus, bus->hostintmask,
			  offsetof(struct sdpcmd_regs, hostintmask), &retries);

		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
				       SBSDIO_WATERMARK, 8, &err);

		/* Set bus state according to enable result */
		drvr->busstate = BRCMF_BUS_DATA;
	}

	else {
		/* Disable F2 again */
		enable = SDIO_FUNC_ENABLE_1;
		brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_0,
				       SDIO_CCCR_IOEx, enable, NULL);
	}

	/* Restore previous clock setting */
	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			       SBSDIO_FUNC1_CHIPCLKCSR, saveclk, &err);

	/* If we didn't come up, turn off backplane clock */
	if (drvr->busstate != BRCMF_BUS_DATA)
		brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);

exit:
	up(&bus->sdsem);

	return ret;
}

void brcmf_sdbrcm_isr(void *arg)
{
	struct brcmf_bus *bus = (struct brcmf_bus *) arg;

	brcmf_dbg(TRACE, "Enter\n");

	if (!bus) {
		brcmf_dbg(ERROR, "bus is null pointer, exiting\n");
		return;
	}

	if (bus->drvr->busstate == BRCMF_BUS_DOWN) {
		brcmf_dbg(ERROR, "bus is down. we have nothing to do\n");
		return;
	}
	/* Count the interrupt call */
	bus->intrcount++;
	bus->ipend = true;

	/* Shouldn't get this interrupt if we're sleeping? */
	if (bus->sleeping) {
		brcmf_dbg(ERROR, "INTERRUPT WHILE SLEEPING??\n");
		return;
	}

	/* Disable additional interrupts (is this needed now)? */
	if (!bus->intr)
		brcmf_dbg(ERROR, "isr w/o interrupt configured!\n");

	bus->dpc_sched = true;
	if (bus->dpc_tsk)
		complete(&bus->dpc_wait);
}

static bool brcmf_sdbrcm_bus_watchdog(struct brcmf_pub *drvr)
{
	struct brcmf_bus *bus;

	brcmf_dbg(TIMER, "Enter\n");

	bus = drvr->bus;

	/* Ignore the timer if simulating bus down */
	if (bus->sleeping)
		return false;

	down(&bus->sdsem);

	/* Poll period: check device if appropriate. */
	if (bus->poll && (++bus->polltick >= bus->pollrate)) {
		u32 intstatus = 0;

		/* Reset poll tick */
		bus->polltick = 0;

		/* Check device if no interrupts */
		if (!bus->intr || (bus->intrcount == bus->lastintrs)) {

			if (!bus->dpc_sched) {
				u8 devpend;
				devpend = brcmf_sdcard_cfg_read(bus->sdiodev,
						SDIO_FUNC_0, SDIO_CCCR_INTx,
						NULL);
				intstatus =
				    devpend & (INTR_STATUS_FUNC1 |
					       INTR_STATUS_FUNC2);
			}

			/* If there is something, make like the ISR and
				 schedule the DPC */
			if (intstatus) {
				bus->pollcnt++;
				bus->ipend = true;

				bus->dpc_sched = true;
				if (bus->dpc_tsk)
					complete(&bus->dpc_wait);
			}
		}

		/* Update interrupt tracking */
		bus->lastintrs = bus->intrcount;
	}
#ifdef BCMDBG
	/* Poll for console output periodically */
	if (drvr->busstate == BRCMF_BUS_DATA && bus->console_interval != 0) {
		bus->console.count += BRCMF_WD_POLL_MS;
		if (bus->console.count >= bus->console_interval) {
			bus->console.count -= bus->console_interval;
			/* Make sure backplane clock is on */
			brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
			if (brcmf_sdbrcm_readconsole(bus) < 0)
				/* stop on error */
				bus->console_interval = 0;
		}
	}
#endif				/* BCMDBG */

	/* On idle timeout clear activity flag and/or turn off clock */
	if ((bus->idletime > 0) && (bus->clkstate == CLK_AVAIL)) {
		if (++bus->idlecount >= bus->idletime) {
			bus->idlecount = 0;
			if (bus->activity) {
				bus->activity = false;
				brcmf_sdbrcm_wd_timer(bus, BRCMF_WD_POLL_MS);
			} else {
				brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
			}
		}
	}

	up(&bus->sdsem);

	return bus->ipend;
}

static bool brcmf_sdbrcm_chipmatch(u16 chipid)
{
	if (chipid == BCM4329_CHIP_ID)
		return true;
	return false;
}

static void brcmf_sdbrcm_release_malloc(struct brcmf_bus *bus)
{
	brcmf_dbg(TRACE, "Enter\n");

	kfree(bus->rxbuf);
	bus->rxctl = bus->rxbuf = NULL;
	bus->rxlen = 0;

	kfree(bus->databuf);
	bus->databuf = NULL;
}

static bool brcmf_sdbrcm_probe_malloc(struct brcmf_bus *bus)
{
	brcmf_dbg(TRACE, "Enter\n");

	if (bus->drvr->maxctl) {
		bus->rxblen =
		    roundup((bus->drvr->maxctl + SDPCM_HDRLEN),
			    ALIGNMENT) + BRCMF_SDALIGN;
		bus->rxbuf = kmalloc(bus->rxblen, GFP_ATOMIC);
		if (!(bus->rxbuf))
			goto fail;
	}

	/* Allocate buffer to receive glomed packet */
	bus->databuf = kmalloc(MAX_DATA_BUF, GFP_ATOMIC);
	if (!(bus->databuf)) {
		/* release rxbuf which was already located as above */
		if (!bus->rxblen)
			kfree(bus->rxbuf);
		goto fail;
	}

	/* Align the buffer */
	if ((unsigned long)bus->databuf % BRCMF_SDALIGN)
		bus->dataptr = bus->databuf + (BRCMF_SDALIGN -
			       ((unsigned long)bus->databuf % BRCMF_SDALIGN));
	else
		bus->dataptr = bus->databuf;

	return true;

fail:
	return false;
}

static bool
brcmf_sdbrcm_probe_attach(struct brcmf_bus *bus, u32 regsva)
{
	u8 clkctl = 0;
	int err = 0;
	int reg_addr;
	u32 reg_val;
	u8 idx;

	bus->alp_only = true;

	/* Return the window to backplane enumeration space for core access */
	if (brcmf_sdcard_set_sbaddr_window(bus->sdiodev, SI_ENUM_BASE))
		brcmf_dbg(ERROR, "FAILED to return to SI_ENUM_BASE\n");

#ifdef BCMDBG
	printk(KERN_DEBUG "F1 signature read @0x18000000=0x%4x\n",
	       brcmf_sdcard_reg_read(bus->sdiodev, SI_ENUM_BASE, 4));

#endif				/* BCMDBG */

	/*
	 * Force PLL off until brcmf_sdio_chip_attach()
	 * programs PLL control regs
	 */

	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			       SBSDIO_FUNC1_CHIPCLKCSR,
			       BRCMF_INIT_CLKCTL1, &err);
	if (!err)
		clkctl =
		    brcmf_sdcard_cfg_read(bus->sdiodev, SDIO_FUNC_1,
					  SBSDIO_FUNC1_CHIPCLKCSR, &err);

	if (err || ((clkctl & ~SBSDIO_AVBITS) != BRCMF_INIT_CLKCTL1)) {
		brcmf_dbg(ERROR, "ChipClkCSR access: err %d wrote 0x%02x read 0x%02x\n",
			  err, BRCMF_INIT_CLKCTL1, clkctl);
		goto fail;
	}

	if (brcmf_sdio_chip_attach(bus->sdiodev, &bus->ci, regsva)) {
		brcmf_dbg(ERROR, "brcmf_sdio_chip_attach failed!\n");
		goto fail;
	}

	if (!brcmf_sdbrcm_chipmatch((u16) bus->ci->chip)) {
		brcmf_dbg(ERROR, "unsupported chip: 0x%04x\n", bus->ci->chip);
		goto fail;
	}

	brcmf_sdio_chip_drivestrengthinit(bus->sdiodev, bus->ci,
					  SDIO_DRIVE_STRENGTH);

	/* Get info on the SOCRAM cores... */
	bus->ramsize = bus->ci->ramsize;
	if (!(bus->ramsize)) {
		brcmf_dbg(ERROR, "failed to find SOCRAM memory!\n");
		goto fail;
	}

	/* Set core control so an SDIO reset does a backplane reset */
	idx = brcmf_sdio_chip_getinfidx(bus->ci, BCMA_CORE_SDIO_DEV);
	reg_addr = bus->ci->c_inf[idx].base +
		   offsetof(struct sdpcmd_regs, corecontrol);
	reg_val = brcmf_sdcard_reg_read(bus->sdiodev, reg_addr, sizeof(u32));
	brcmf_sdcard_reg_write(bus->sdiodev, reg_addr, sizeof(u32),
			       reg_val | CC_BPRESEN);

	brcmu_pktq_init(&bus->txq, (PRIOMASK + 1), TXQLEN);

	/* Locate an appropriately-aligned portion of hdrbuf */
	bus->rxhdr = (u8 *) roundup((unsigned long)&bus->hdrbuf[0],
				    BRCMF_SDALIGN);

	/* Set the poll and/or interrupt flags */
	bus->intr = true;
	bus->poll = false;
	if (bus->poll)
		bus->pollrate = 1;

	return true;

fail:
	return false;
}

static bool brcmf_sdbrcm_probe_init(struct brcmf_bus *bus)
{
	brcmf_dbg(TRACE, "Enter\n");

	/* Disable F2 to clear any intermediate frame state on the dongle */
	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_0, SDIO_CCCR_IOEx,
			       SDIO_FUNC_ENABLE_1, NULL);

	bus->drvr->busstate = BRCMF_BUS_DOWN;
	bus->sleeping = false;
	bus->rxflow = false;

	/* Done with backplane-dependent accesses, can drop clock... */
	brcmf_sdcard_cfg_write(bus->sdiodev, SDIO_FUNC_1,
			       SBSDIO_FUNC1_CHIPCLKCSR, 0, NULL);

	/* ...and initialize clock/power states */
	bus->clkstate = CLK_SDONLY;
	bus->idletime = BRCMF_IDLE_INTERVAL;
	bus->idleclock = BRCMF_IDLE_ACTIVE;

	/* Query the F2 block size, set roundup accordingly */
	bus->blocksize = bus->sdiodev->func[2]->cur_blksize;
	bus->roundup = min(max_roundup, bus->blocksize);

	/* bus module does not support packet chaining */
	bus->use_rxchain = false;
	bus->sd_rxchain = false;

	return true;
}

static int
brcmf_sdbrcm_watchdog_thread(void *data)
{
	struct brcmf_bus *bus = (struct brcmf_bus *)data;

	allow_signal(SIGTERM);
	/* Run until signal received */
	while (1) {
		if (kthread_should_stop())
			break;
		if (!wait_for_completion_interruptible(&bus->watchdog_wait)) {
			brcmf_sdbrcm_bus_watchdog(bus->drvr);
			/* Count the tick for reference */
			bus->drvr->tickcnt++;
		} else
			break;
	}
	return 0;
}

static void
brcmf_sdbrcm_watchdog(unsigned long data)
{
	struct brcmf_bus *bus = (struct brcmf_bus *)data;

	if (bus->watchdog_tsk) {
		complete(&bus->watchdog_wait);
		/* Reschedule the watchdog */
		if (bus->wd_timer_valid)
			mod_timer(&bus->timer,
				  jiffies + BRCMF_WD_POLL_MS * HZ / 1000);
	}
}

static void brcmf_sdbrcm_release_dongle(struct brcmf_bus *bus)
{
	brcmf_dbg(TRACE, "Enter\n");

	if (bus->ci) {
		brcmf_sdbrcm_clkctl(bus, CLK_AVAIL, false);
		brcmf_sdbrcm_clkctl(bus, CLK_NONE, false);
		brcmf_sdio_chip_detach(&bus->ci);
		if (bus->vars && bus->varsz)
			kfree(bus->vars);
		bus->vars = NULL;
	}

	brcmf_dbg(TRACE, "Disconnected\n");
}

/* Detach and free everything */
static void brcmf_sdbrcm_release(struct brcmf_bus *bus)
{
	brcmf_dbg(TRACE, "Enter\n");

	if (bus) {
		/* De-register interrupt handler */
		brcmf_sdcard_intr_dereg(bus->sdiodev);

		if (bus->drvr) {
			brcmf_detach(bus->drvr);
			brcmf_sdbrcm_release_dongle(bus);
			bus->drvr = NULL;
		}

		brcmf_sdbrcm_release_malloc(bus);

		kfree(bus);
	}

	brcmf_dbg(TRACE, "Disconnected\n");
}

void *brcmf_sdbrcm_probe(u16 bus_no, u16 slot, u16 func, uint bustype,
			 u32 regsva, struct brcmf_sdio_dev *sdiodev)
{
	int ret;
	struct brcmf_bus *bus;

	/* Init global variables at run-time, not as part of the declaration.
	 * This is required to support init/de-init of the driver.
	 * Initialization
	 * of globals as part of the declaration results in non-deterministic
	 * behavior since the value of the globals may be different on the
	 * first time that the driver is initialized vs subsequent
	 * initializations.
	 */
	brcmf_c_init();

	brcmf_dbg(TRACE, "Enter\n");

	/* We make an assumption about address window mappings:
	 * regsva == SI_ENUM_BASE*/

	/* Allocate private bus interface state */
	bus = kzalloc(sizeof(struct brcmf_bus), GFP_ATOMIC);
	if (!bus)
		goto fail;

	bus->sdiodev = sdiodev;
	sdiodev->bus = bus;
	skb_queue_head_init(&bus->glom);
	bus->txbound = BRCMF_TXBOUND;
	bus->rxbound = BRCMF_RXBOUND;
	bus->txminmax = BRCMF_TXMINMAX;
	bus->tx_seq = SDPCM_SEQUENCE_WRAP - 1;
	bus->usebufpool = false;	/* Use bufpool if allocated,
					 else use locally malloced rxbuf */

	/* attempt to attach to the dongle */
	if (!(brcmf_sdbrcm_probe_attach(bus, regsva))) {
		brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_attach failed\n");
		goto fail;
	}

	spin_lock_init(&bus->txqlock);
	init_waitqueue_head(&bus->ctrl_wait);
	init_waitqueue_head(&bus->dcmd_resp_wait);

	/* Set up the watchdog timer */
	init_timer(&bus->timer);
	bus->timer.data = (unsigned long)bus;
	bus->timer.function = brcmf_sdbrcm_watchdog;

	/* Initialize thread based operation and lock */
	sema_init(&bus->sdsem, 1);

	/* Initialize watchdog thread */
	init_completion(&bus->watchdog_wait);
	bus->watchdog_tsk = kthread_run(brcmf_sdbrcm_watchdog_thread,
					bus, "brcmf_watchdog");
	if (IS_ERR(bus->watchdog_tsk)) {
		printk(KERN_WARNING
		       "brcmf_watchdog thread failed to start\n");
		bus->watchdog_tsk = NULL;
	}
	/* Initialize DPC thread */
	init_completion(&bus->dpc_wait);
	bus->dpc_tsk = kthread_run(brcmf_sdbrcm_dpc_thread,
				   bus, "brcmf_dpc");
	if (IS_ERR(bus->dpc_tsk)) {
		printk(KERN_WARNING
		       "brcmf_dpc thread failed to start\n");
		bus->dpc_tsk = NULL;
	}

	/* Attach to the brcmf/OS/network interface */
	bus->drvr = brcmf_attach(bus, SDPCM_RESERVE);
	if (!bus->drvr) {
		brcmf_dbg(ERROR, "brcmf_attach failed\n");
		goto fail;
	}

	/* Allocate buffers */
	if (!(brcmf_sdbrcm_probe_malloc(bus))) {
		brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_malloc failed\n");
		goto fail;
	}

	if (!(brcmf_sdbrcm_probe_init(bus))) {
		brcmf_dbg(ERROR, "brcmf_sdbrcm_probe_init failed\n");
		goto fail;
	}

	/* Register interrupt callback, but mask it (not operational yet). */
	brcmf_dbg(INTR, "disable SDIO interrupts (not interested yet)\n");
	ret = brcmf_sdcard_intr_reg(bus->sdiodev);
	if (ret != 0) {
		brcmf_dbg(ERROR, "FAILED: sdcard_intr_reg returned %d\n", ret);
		goto fail;
	}
	brcmf_dbg(INTR, "registered SDIO interrupt function ok\n");

	brcmf_dbg(INFO, "completed!!\n");

	/* if firmware path present try to download and bring up bus */
	ret = brcmf_bus_start(bus->drvr);
	if (ret != 0) {
		if (ret == -ENOLINK) {
			brcmf_dbg(ERROR, "dongle is not responding\n");
			goto fail;
		}
	}

	/* add interface and open for business */
	if (brcmf_add_if((struct brcmf_info *)bus->drvr, 0, "wlan%d", NULL)) {
		brcmf_dbg(ERROR, "Add primary net device interface failed!!\n");
		goto fail;
	}

	return bus;

fail:
	brcmf_sdbrcm_release(bus);
	return NULL;
}

void brcmf_sdbrcm_disconnect(void *ptr)
{
	struct brcmf_bus *bus = (struct brcmf_bus *)ptr;

	brcmf_dbg(TRACE, "Enter\n");

	if (bus)
		brcmf_sdbrcm_release(bus);

	brcmf_dbg(TRACE, "Disconnected\n");
}

struct device *brcmf_bus_get_device(struct brcmf_bus *bus)
{
	return &bus->sdiodev->func[2]->dev;
}

void
brcmf_sdbrcm_wd_timer(struct brcmf_bus *bus, uint wdtick)
{
	/* Totally stop the timer */
	if (!wdtick && bus->wd_timer_valid == true) {
		del_timer_sync(&bus->timer);
		bus->wd_timer_valid = false;
		bus->save_ms = wdtick;
		return;
	}

	/* don't start the wd until fw is loaded */
	if (bus->drvr->busstate == BRCMF_BUS_DOWN)
		return;

	if (wdtick) {
		if (bus->save_ms != BRCMF_WD_POLL_MS) {
			if (bus->wd_timer_valid == true)
				/* Stop timer and restart at new value */
				del_timer_sync(&bus->timer);

			/* Create timer again when watchdog period is
			   dynamically changed or in the first instance
			 */
			bus->timer.expires =
				jiffies + BRCMF_WD_POLL_MS * HZ / 1000;
			add_timer(&bus->timer);

		} else {
			/* Re arm the timer, at last watchdog period */
			mod_timer(&bus->timer,
				jiffies + BRCMF_WD_POLL_MS * HZ / 1000);
		}

		bus->wd_timer_valid = true;
		bus->save_ms = wdtick;
	}
}