aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/scsi/nsp32.c
blob: 7fed35372150afe68d619d61d4faa4a2a4588437 (plain) (tree)
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
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
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338




























                                                                       









                            
                              










                             
















































































































































                                                                                                     
                                      
                                                                                            
 
                                                            












































                                                                                                         
                                             





































                                                                       

                                                              
                                               















































































































































































                                                                                 
                                                 

































































































































                                                                                                 
                                                 





























































































































                                                                                           
                                              



















































































































































                                                                                     
                               



                                                        




                                                             






                                                     


                                                                           

                                                                      















                                                                                                                   















                                                                                        
                                                                                 









                                                                                      
                                                             



















                                                                       
                                                   
 

                                                                 





























                                                                                       
                                               










































































































































































                                                                                      
                                                      








                                                       
                                            
 
                                                  






























































































                                                                                               
                                                  



















                                                                                 
                                                                            

















































































































































                                                                                                           
                                                       













                                                                                                                                           


                                                                              




                                       
                                 









                                                  
                               





















































































                                                                                                            
                              
 


























































































































































                                                                              
                                                                    










































                                                                                                          
                                                                               










































                                                                                  
                                              


                                                       

                                                                               































































































































                                                                                   
                                              










































































































































































































































































































































































































































































































































































































































































                                                                                  
                                             











                                                               
                                                                       
















                                                                





















































                                                                            
                                                          






                                                                   
                                                                                                   







                                                                     
                                                                       






































































                                                                                               
                                                                               
















                                                                             
                                              



                                                               
                             

                                    
 


                                                       



                                  
                                                      


                                                           
                                                          





                                                               
                 
 









































































                                                                             

                                                      






                                                                  
                                                        





















































                                                                         

                                                      




                                                                  
                                                        




























































































































































































































































































































































































                                                                                   
                                                                  






                                                                                                                         
                                                                 












                                                                                                      

                                             


















                                                                         




























                                                                                      
                                 













                                                                         
                                                       


                                                 




                               

 







                                                    







                                                                      
                                                  










                                             
/*
 * NinjaSCSI-32Bi Cardbus, NinjaSCSI-32UDE PCI/CardBus SCSI driver
 * Copyright (C) 2001, 2002, 2003
 *      YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
 *      GOTO Masanori <gotom@debian.or.jp>, <gotom@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * Revision History:
 *   1.0: Initial Release.
 *   1.1: Add /proc SDTR status.
 *        Remove obsolete error handler nsp32_reset.
 *        Some clean up.
 *   1.2: PowerPC (big endian) support.
 */

#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/dma-mapping.h>

#include <asm/dma.h>
#include <asm/system.h>
#include <asm/io.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>

#include "nsp32.h"


/***********************************************************************
 * Module parameters
 */
static int       trans_mode = 0;	/* default: BIOS */
module_param     (trans_mode, int, 0);
MODULE_PARM_DESC(trans_mode, "transfer mode (0: BIOS(default) 1: Async 2: Ultra20M");
#define ASYNC_MODE    1
#define ULTRA20M_MODE 2

static int       auto_param = 0;	/* default: ON */
module_param     (auto_param, bool, 0);
MODULE_PARM_DESC(auto_param, "AutoParameter mode (0: ON(default) 1: OFF)");

static int       disc_priv  = 1;	/* default: OFF */
module_param     (disc_priv, bool, 0);
MODULE_PARM_DESC(disc_priv,  "disconnection privilege mode (0: ON 1: OFF(default))");

MODULE_AUTHOR("YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>, GOTO Masanori <gotom@debian.or.jp>");
MODULE_DESCRIPTION("Workbit NinjaSCSI-32Bi/UDE CardBus/PCI SCSI host bus adapter module");
MODULE_LICENSE("GPL");

static const char *nsp32_release_version = "1.2";


/****************************************************************************
 * Supported hardware
 */
static struct pci_device_id nsp32_pci_table[] __devinitdata = {
	{
		.vendor      = PCI_VENDOR_ID_IODATA,
		.device      = PCI_DEVICE_ID_NINJASCSI_32BI_CBSC_II,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_IODATA,
	},
	{
		.vendor      = PCI_VENDOR_ID_WORKBIT,
		.device      = PCI_DEVICE_ID_NINJASCSI_32BI_KME,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_KME,
	},
	{
		.vendor      = PCI_VENDOR_ID_WORKBIT,
		.device      = PCI_DEVICE_ID_NINJASCSI_32BI_WBT,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_WORKBIT,
	},
	{
		.vendor      = PCI_VENDOR_ID_WORKBIT,
		.device      = PCI_DEVICE_ID_WORKBIT_STANDARD,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_PCI_WORKBIT,
	},
	{
		.vendor      = PCI_VENDOR_ID_WORKBIT,
		.device      = PCI_DEVICE_ID_NINJASCSI_32BI_LOGITEC,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_LOGITEC,
	},
	{
		.vendor      = PCI_VENDOR_ID_WORKBIT,
		.device      = PCI_DEVICE_ID_NINJASCSI_32BIB_LOGITEC,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_PCI_LOGITEC,
	},
	{
		.vendor      = PCI_VENDOR_ID_WORKBIT,
		.device      = PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_PCI_MELCO,
	},
	{
		.vendor      = PCI_VENDOR_ID_WORKBIT,
		.device      = PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO_II,
		.subvendor   = PCI_ANY_ID,
		.subdevice   = PCI_ANY_ID,
		.driver_data = MODEL_PCI_MELCO,
	},
	{0,0,},
};
MODULE_DEVICE_TABLE(pci, nsp32_pci_table);

static nsp32_hw_data nsp32_data_base;  /* probe <-> detect glue */


/*
 * Period/AckWidth speed conversion table
 *
 * Note: This period/ackwidth speed table must be in descending order.
 */
static nsp32_sync_table nsp32_sync_table_40M[] = {
     /* {PNo, AW,   SP,   EP, SREQ smpl}  Speed(MB/s) Period AckWidth */
	{0x1,  0, 0x0c, 0x0c, SMPL_40M},  /*  20.0 :  50ns,  25ns */
	{0x2,  0, 0x0d, 0x18, SMPL_40M},  /*  13.3 :  75ns,  25ns */
	{0x3,  1, 0x19, 0x19, SMPL_40M},  /*  10.0 : 100ns,  50ns */
	{0x4,  1, 0x1a, 0x1f, SMPL_20M},  /*   8.0 : 125ns,  50ns */
	{0x5,  2, 0x20, 0x25, SMPL_20M},  /*   6.7 : 150ns,  75ns */
	{0x6,  2, 0x26, 0x31, SMPL_20M},  /*   5.7 : 175ns,  75ns */
	{0x7,  3, 0x32, 0x32, SMPL_20M},  /*   5.0 : 200ns, 100ns */
	{0x8,  3, 0x33, 0x38, SMPL_10M},  /*   4.4 : 225ns, 100ns */
	{0x9,  3, 0x39, 0x3e, SMPL_10M},  /*   4.0 : 250ns, 100ns */
};

static nsp32_sync_table nsp32_sync_table_20M[] = {
	{0x1,  0, 0x19, 0x19, SMPL_40M},  /* 10.0 : 100ns,  50ns */
	{0x2,  0, 0x1a, 0x25, SMPL_20M},  /*  6.7 : 150ns,  50ns */
	{0x3,  1, 0x26, 0x32, SMPL_20M},  /*  5.0 : 200ns, 100ns */
	{0x4,  1, 0x33, 0x3e, SMPL_10M},  /*  4.0 : 250ns, 100ns */
	{0x5,  2, 0x3f, 0x4b, SMPL_10M},  /*  3.3 : 300ns, 150ns */
	{0x6,  2, 0x4c, 0x57, SMPL_10M},  /*  2.8 : 350ns, 150ns */
	{0x7,  3, 0x58, 0x64, SMPL_10M},  /*  2.5 : 400ns, 200ns */
	{0x8,  3, 0x65, 0x70, SMPL_10M},  /*  2.2 : 450ns, 200ns */
	{0x9,  3, 0x71, 0x7d, SMPL_10M},  /*  2.0 : 500ns, 200ns */
};

static nsp32_sync_table nsp32_sync_table_pci[] = {
	{0x1,  0, 0x0c, 0x0f, SMPL_40M},  /* 16.6 :  60ns,  30ns */
	{0x2,  0, 0x10, 0x16, SMPL_40M},  /* 11.1 :  90ns,  30ns */
	{0x3,  1, 0x17, 0x1e, SMPL_20M},  /*  8.3 : 120ns,  60ns */
	{0x4,  1, 0x1f, 0x25, SMPL_20M},  /*  6.7 : 150ns,  60ns */
	{0x5,  2, 0x26, 0x2d, SMPL_20M},  /*  5.6 : 180ns,  90ns */
	{0x6,  2, 0x2e, 0x34, SMPL_10M},  /*  4.8 : 210ns,  90ns */
	{0x7,  3, 0x35, 0x3c, SMPL_10M},  /*  4.2 : 240ns, 120ns */
	{0x8,  3, 0x3d, 0x43, SMPL_10M},  /*  3.7 : 270ns, 120ns */
	{0x9,  3, 0x44, 0x4b, SMPL_10M},  /*  3.3 : 300ns, 120ns */
};

/*
 * function declaration
 */
/* module entry point */
static int  __devinit nsp32_probe (struct pci_dev *, const struct pci_device_id *);
static void __devexit nsp32_remove(struct pci_dev *);
static int  __init    init_nsp32  (void);
static void __exit    exit_nsp32  (void);

/* struct struct scsi_host_template */
static int         nsp32_proc_info   (struct Scsi_Host *, char *, char **, off_t, int, int);

static int         nsp32_detect      (struct pci_dev *pdev);
static int         nsp32_queuecommand(struct scsi_cmnd *,
		void (*done)(struct scsi_cmnd *));
static const char *nsp32_info        (struct Scsi_Host *);
static int         nsp32_release     (struct Scsi_Host *);

/* SCSI error handler */
static int         nsp32_eh_abort     (struct scsi_cmnd *);
static int         nsp32_eh_bus_reset (struct scsi_cmnd *);
static int         nsp32_eh_host_reset(struct scsi_cmnd *);

/* generate SCSI message */
static void nsp32_build_identify(struct scsi_cmnd *);
static void nsp32_build_nop     (struct scsi_cmnd *);
static void nsp32_build_reject  (struct scsi_cmnd *);
static void nsp32_build_sdtr    (struct scsi_cmnd *, unsigned char, unsigned char);

/* SCSI message handler */
static int  nsp32_busfree_occur(struct scsi_cmnd *, unsigned short);
static void nsp32_msgout_occur (struct scsi_cmnd *);
static void nsp32_msgin_occur  (struct scsi_cmnd *, unsigned long, unsigned short);

static int  nsp32_setup_sg_table    (struct scsi_cmnd *);
static int  nsp32_selection_autopara(struct scsi_cmnd *);
static int  nsp32_selection_autoscsi(struct scsi_cmnd *);
static void nsp32_scsi_done         (struct scsi_cmnd *);
static int  nsp32_arbitration       (struct scsi_cmnd *, unsigned int);
static int  nsp32_reselection       (struct scsi_cmnd *, unsigned char);
static void nsp32_adjust_busfree    (struct scsi_cmnd *, unsigned int);
static void nsp32_restart_autoscsi  (struct scsi_cmnd *, unsigned short);

/* SCSI SDTR */
static void nsp32_analyze_sdtr       (struct scsi_cmnd *);
static int  nsp32_search_period_entry(nsp32_hw_data *, nsp32_target *, unsigned char);
static void nsp32_set_async          (nsp32_hw_data *, nsp32_target *);
static void nsp32_set_max_sync       (nsp32_hw_data *, nsp32_target *, unsigned char *, unsigned char *);
static void nsp32_set_sync_entry     (nsp32_hw_data *, nsp32_target *, int, unsigned char);

/* SCSI bus status handler */
static void nsp32_wait_req    (nsp32_hw_data *, int);
static void nsp32_wait_sack   (nsp32_hw_data *, int);
static void nsp32_sack_assert (nsp32_hw_data *);
static void nsp32_sack_negate (nsp32_hw_data *);
static void nsp32_do_bus_reset(nsp32_hw_data *);

/* hardware interrupt handler */
static irqreturn_t do_nsp32_isr(int, void *);

/* initialize hardware */
static int  nsp32hw_init(nsp32_hw_data *);

/* EEPROM handler */
static        int  nsp32_getprom_param (nsp32_hw_data *);
static        int  nsp32_getprom_at24  (nsp32_hw_data *);
static        int  nsp32_getprom_c16   (nsp32_hw_data *);
static        void nsp32_prom_start    (nsp32_hw_data *);
static        void nsp32_prom_stop     (nsp32_hw_data *);
static        int  nsp32_prom_read     (nsp32_hw_data *, int);
static        int  nsp32_prom_read_bit (nsp32_hw_data *);
static        void nsp32_prom_write_bit(nsp32_hw_data *, int);
static        void nsp32_prom_set      (nsp32_hw_data *, int, int);
static        int  nsp32_prom_get      (nsp32_hw_data *, int);

/* debug/warning/info message */
static void nsp32_message (const char *, int, char *, char *, ...);
#ifdef NSP32_DEBUG
static void nsp32_dmessage(const char *, int, int,    char *, ...);
#endif

/*
 * max_sectors is currently limited up to 128.
 */
static struct scsi_host_template nsp32_template = {
	.proc_name			= "nsp32",
	.name				= "Workbit NinjaSCSI-32Bi/UDE",
	.proc_info			= nsp32_proc_info,
	.info				= nsp32_info,
	.queuecommand			= nsp32_queuecommand,
	.can_queue			= 1,
	.sg_tablesize			= NSP32_SG_SIZE,
	.max_sectors			= 128,
	.cmd_per_lun			= 1,
	.this_id			= NSP32_HOST_SCSIID,
	.use_clustering			= DISABLE_CLUSTERING,
	.eh_abort_handler       	= nsp32_eh_abort,
	.eh_bus_reset_handler		= nsp32_eh_bus_reset,
	.eh_host_reset_handler		= nsp32_eh_host_reset,
/*	.highmem_io			= 1, */
};

#include "nsp32_io.h"

/***********************************************************************
 * debug, error print
 */
#ifndef NSP32_DEBUG
# define NSP32_DEBUG_MASK	      0x000000
# define nsp32_msg(type, args...)     nsp32_message ("", 0, (type), args)
# define nsp32_dbg(mask, args...)     /* */
#else
# define NSP32_DEBUG_MASK	      0xffffff
# define nsp32_msg(type, args...) \
	nsp32_message (__FUNCTION__, __LINE__, (type), args)
# define nsp32_dbg(mask, args...) \
	nsp32_dmessage(__FUNCTION__, __LINE__, (mask), args)
#endif

#define NSP32_DEBUG_QUEUECOMMAND	BIT(0)
#define NSP32_DEBUG_REGISTER		BIT(1)
#define NSP32_DEBUG_AUTOSCSI		BIT(2)
#define NSP32_DEBUG_INTR		BIT(3)
#define NSP32_DEBUG_SGLIST		BIT(4)
#define NSP32_DEBUG_BUSFREE		BIT(5)
#define NSP32_DEBUG_CDB_CONTENTS	BIT(6)
#define NSP32_DEBUG_RESELECTION		BIT(7)
#define NSP32_DEBUG_MSGINOCCUR		BIT(8)
#define NSP32_DEBUG_EEPROM		BIT(9)
#define NSP32_DEBUG_MSGOUTOCCUR		BIT(10)
#define NSP32_DEBUG_BUSRESET		BIT(11)
#define NSP32_DEBUG_RESTART		BIT(12)
#define NSP32_DEBUG_SYNC		BIT(13)
#define NSP32_DEBUG_WAIT		BIT(14)
#define NSP32_DEBUG_TARGETFLAG		BIT(15)
#define NSP32_DEBUG_PROC		BIT(16)
#define NSP32_DEBUG_INIT		BIT(17)
#define NSP32_SPECIAL_PRINT_REGISTER	BIT(20)

#define NSP32_DEBUG_BUF_LEN		100

static void nsp32_message(const char *func, int line, char *type, char *fmt, ...)
{
	va_list args;
	char buf[NSP32_DEBUG_BUF_LEN];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);

#ifndef NSP32_DEBUG
	printk("%snsp32: %s\n", type, buf);
#else
	printk("%snsp32: %s (%d): %s\n", type, func, line, buf);
#endif
}

#ifdef NSP32_DEBUG
static void nsp32_dmessage(const char *func, int line, int mask, char *fmt, ...)
{
	va_list args;
	char buf[NSP32_DEBUG_BUF_LEN];

	va_start(args, fmt);
	vsnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);

	if (mask & NSP32_DEBUG_MASK) {
		printk("nsp32-debug: 0x%x %s (%d): %s\n", mask, func, line, buf);
	}
}
#endif

#ifdef NSP32_DEBUG
# include "nsp32_debug.c"
#else
# define show_command(arg)   /* */
# define show_busphase(arg)  /* */
# define show_autophase(arg) /* */
#endif

/*
 * IDENTIFY Message
 */
static void nsp32_build_identify(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	int pos             = data->msgout_len;
	int mode            = FALSE;

	/* XXX: Auto DiscPriv detection is progressing... */
	if (disc_priv == 0) {
		/* mode = TRUE; */
	}

	data->msgoutbuf[pos] = IDENTIFY(mode, SCpnt->device->lun); pos++;

	data->msgout_len = pos;
}

/*
 * SDTR Message Routine
 */
static void nsp32_build_sdtr(struct scsi_cmnd    *SCpnt,
			     unsigned char period,
			     unsigned char offset)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	int pos             = data->msgout_len;

	data->msgoutbuf[pos] = EXTENDED_MESSAGE;  pos++;
	data->msgoutbuf[pos] = EXTENDED_SDTR_LEN; pos++;
	data->msgoutbuf[pos] = EXTENDED_SDTR;     pos++;
	data->msgoutbuf[pos] = period;            pos++;
	data->msgoutbuf[pos] = offset;            pos++;

	data->msgout_len = pos;
}

/*
 * No Operation Message
 */
static void nsp32_build_nop(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	int            pos  = data->msgout_len;

	if (pos != 0) {
		nsp32_msg(KERN_WARNING,
			  "Some messages are already contained!");
		return;
	}

	data->msgoutbuf[pos] = NOP; pos++;
	data->msgout_len = pos;
}

/*
 * Reject Message
 */
static void nsp32_build_reject(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	int            pos  = data->msgout_len;

	data->msgoutbuf[pos] = MESSAGE_REJECT; pos++;
	data->msgout_len = pos;
}
	
/*
 * timer
 */
#if 0
static void nsp32_start_timer(struct scsi_cmnd *SCpnt, int time)
{
	unsigned int base = SCpnt->host->io_port;

	nsp32_dbg(NSP32_DEBUG_INTR, "timer=%d", time);

	if (time & (~TIMER_CNT_MASK)) {
		nsp32_dbg(NSP32_DEBUG_INTR, "timer set overflow");
	}

	nsp32_write2(base, TIMER_SET, time & TIMER_CNT_MASK);
}
#endif


/*
 * set SCSI command and other parameter to asic, and start selection phase
 */
static int nsp32_selection_autopara(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data  *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int	base    = SCpnt->device->host->io_port;
	unsigned int	host_id = SCpnt->device->host->this_id;
	unsigned char	target  = scmd_id(SCpnt);
	nsp32_autoparam *param  = data->autoparam;
	unsigned char	phase;
	int		i, ret;
	unsigned int	msgout;
	u16_le	        s;

	nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "in");

	/*
	 * check bus free
	 */
	phase = nsp32_read1(base, SCSI_BUS_MONITOR);
	if (phase != BUSMON_BUS_FREE) {
		nsp32_msg(KERN_WARNING, "bus busy");
		show_busphase(phase & BUSMON_PHASE_MASK);
		SCpnt->result = DID_BUS_BUSY << 16;
		return FALSE;
	}

	/*
	 * message out
	 *
	 * Note: If the range of msgout_len is 1 - 3, fill scsi_msgout.
	 *       over 3 messages needs another routine.
	 */
	if (data->msgout_len == 0) {
		nsp32_msg(KERN_ERR, "SCSI MsgOut without any message!");
		SCpnt->result = DID_ERROR << 16;
		return FALSE;
	} else if (data->msgout_len > 0 && data->msgout_len <= 3) {
		msgout = 0;
		for (i = 0; i < data->msgout_len; i++) {
			/*
			 * the sending order of the message is:
			 *  MCNT 3: MSG#0 -> MSG#1 -> MSG#2
			 *  MCNT 2:          MSG#1 -> MSG#2
			 *  MCNT 1:                   MSG#2    
			 */
			msgout >>= 8;
			msgout |= ((unsigned int)(data->msgoutbuf[i]) << 24);
		}
		msgout |= MV_VALID;	/* MV valid */
		msgout |= (unsigned int)data->msgout_len; /* len */
	} else {
		/* data->msgout_len > 3 */
		msgout = 0;
	}

	// nsp_dbg(NSP32_DEBUG_AUTOSCSI, "sel time out=0x%x\n", nsp32_read2(base, SEL_TIME_OUT));
	// nsp32_write2(base, SEL_TIME_OUT,   SEL_TIMEOUT_TIME);

	/*
	 * setup asic parameter
	 */
	memset(param, 0, sizeof(nsp32_autoparam));

	/* cdb */
	for (i = 0; i < SCpnt->cmd_len; i++) {
		param->cdb[4 * i] = SCpnt->cmnd[i];
	}

	/* outgoing messages */
	param->msgout = cpu_to_le32(msgout);

	/* syncreg, ackwidth, target id, SREQ sampling rate */
	param->syncreg    = data->cur_target->syncreg;
	param->ackwidth   = data->cur_target->ackwidth;
	param->target_id  = BIT(host_id) | BIT(target);
	param->sample_reg = data->cur_target->sample_reg;

	// nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "sample rate=0x%x\n", data->cur_target->sample_reg);

	/* command control */
	param->command_control = cpu_to_le16(CLEAR_CDB_FIFO_POINTER |
					     AUTOSCSI_START         |
					     AUTO_MSGIN_00_OR_04    |
					     AUTO_MSGIN_02          |
					     AUTO_ATN               );


	/* transfer control */
	s = 0;
	switch (data->trans_method) {
	case NSP32_TRANSFER_BUSMASTER:
		s |= BM_START;
		break;
	case NSP32_TRANSFER_MMIO:
		s |= CB_MMIO_MODE;
		break;
	case NSP32_TRANSFER_PIO:
		s |= CB_IO_MODE;
		break;
	default:
		nsp32_msg(KERN_ERR, "unknown trans_method");
		break;
	}
	/*
	 * OR-ed BLIEND_MODE, FIFO intr is decreased, instead of PCI bus waits.
	 * For bus master transfer, it's taken off.
	 */
	s |= (TRANSFER_GO | ALL_COUNTER_CLR);
	param->transfer_control = cpu_to_le16(s);

	/* sg table addr */
	param->sgt_pointer = cpu_to_le32(data->cur_lunt->sglun_paddr);

	/*
	 * transfer parameter to ASIC
	 */
	nsp32_write4(base, SGT_ADR,         data->auto_paddr);
	nsp32_write2(base, COMMAND_CONTROL, CLEAR_CDB_FIFO_POINTER |
		                            AUTO_PARAMETER         );

	/*
	 * Check arbitration
	 */
	ret = nsp32_arbitration(SCpnt, base);

	return ret;
}


/*
 * Selection with AUTO SCSI (without AUTO PARAMETER)
 */
static int nsp32_selection_autoscsi(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data  *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int	base    = SCpnt->device->host->io_port;
	unsigned int	host_id = SCpnt->device->host->this_id;
	unsigned char	target  = scmd_id(SCpnt);
	unsigned char	phase;
	int		status;
	unsigned short	command	= 0;
	unsigned int	msgout  = 0;
	unsigned short	execph;
	int		i;

	nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "in");

	/*
	 * IRQ disable
	 */
	nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);

	/*
	 * check bus line
	 */
	phase = nsp32_read1(base, SCSI_BUS_MONITOR);
	if(((phase & BUSMON_BSY) == 1) || (phase & BUSMON_SEL) == 1) {
		nsp32_msg(KERN_WARNING, "bus busy");
		SCpnt->result = DID_BUS_BUSY << 16;
		status = 1;
		goto out;
        }

	/*
	 * clear execph
	 */
	execph = nsp32_read2(base, SCSI_EXECUTE_PHASE);

	/*
	 * clear FIFO counter to set CDBs
	 */
	nsp32_write2(base, COMMAND_CONTROL, CLEAR_CDB_FIFO_POINTER);

	/*
	 * set CDB0 - CDB15
	 */
	for (i = 0; i < SCpnt->cmd_len; i++) {
		nsp32_write1(base, COMMAND_DATA, SCpnt->cmnd[i]);
        }
	nsp32_dbg(NSP32_DEBUG_CDB_CONTENTS, "CDB[0]=[0x%x]", SCpnt->cmnd[0]);

	/*
	 * set SCSIOUT LATCH(initiator)/TARGET(target) (OR-ed) ID
	 */
	nsp32_write1(base, SCSI_OUT_LATCH_TARGET_ID, BIT(host_id) | BIT(target));

	/*
	 * set SCSI MSGOUT REG
	 *
	 * Note: If the range of msgout_len is 1 - 3, fill scsi_msgout.
	 *       over 3 messages needs another routine.
	 */
	if (data->msgout_len == 0) {
		nsp32_msg(KERN_ERR, "SCSI MsgOut without any message!");
		SCpnt->result = DID_ERROR << 16;
		status = 1;
		goto out;
	} else if (data->msgout_len > 0 && data->msgout_len <= 3) {
		msgout = 0;
		for (i = 0; i < data->msgout_len; i++) {
			/*
			 * the sending order of the message is:
			 *  MCNT 3: MSG#0 -> MSG#1 -> MSG#2
			 *  MCNT 2:          MSG#1 -> MSG#2
			 *  MCNT 1:                   MSG#2    
			 */
			msgout >>= 8;
			msgout |= ((unsigned int)(data->msgoutbuf[i]) << 24);
		}
		msgout |= MV_VALID;	/* MV valid */
		msgout |= (unsigned int)data->msgout_len; /* len */
		nsp32_write4(base, SCSI_MSG_OUT, msgout);
	} else {
		/* data->msgout_len > 3 */
		nsp32_write4(base, SCSI_MSG_OUT, 0);
	}

	/*
	 * set selection timeout(= 250ms)
	 */
	nsp32_write2(base, SEL_TIME_OUT,   SEL_TIMEOUT_TIME);

	/*
	 * set SREQ hazard killer sampling rate
	 * 
	 * TODO: sample_rate (BASE+0F) is 0 when internal clock = 40MHz.
	 *      check other internal clock!
	 */
	nsp32_write1(base, SREQ_SMPL_RATE, data->cur_target->sample_reg);

	/*
	 * clear Arbit
	 */
	nsp32_write1(base, SET_ARBIT,      ARBIT_CLEAR);

	/*
	 * set SYNCREG
	 * Don't set BM_START_ADR before setting this register.
	 */
	nsp32_write1(base, SYNC_REG,  data->cur_target->syncreg);

	/*
	 * set ACKWIDTH
	 */
	nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth);

	nsp32_dbg(NSP32_DEBUG_AUTOSCSI,
		  "syncreg=0x%x, ackwidth=0x%x, sgtpaddr=0x%x, id=0x%x",
		  nsp32_read1(base, SYNC_REG), nsp32_read1(base, ACK_WIDTH),
		  nsp32_read4(base, SGT_ADR), nsp32_read1(base, SCSI_OUT_LATCH_TARGET_ID));
	nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "msgout_len=%d, msgout=0x%x",
		  data->msgout_len, msgout);

	/*
	 * set SGT ADDR (physical address)
	 */
	nsp32_write4(base, SGT_ADR, data->cur_lunt->sglun_paddr);

	/*
	 * set TRANSFER CONTROL REG
	 */
	command = 0;
	command |= (TRANSFER_GO | ALL_COUNTER_CLR);
	if (data->trans_method & NSP32_TRANSFER_BUSMASTER) {
		if (scsi_bufflen(SCpnt) > 0) {
			command |= BM_START;
		}
	} else if (data->trans_method & NSP32_TRANSFER_MMIO) {
		command |= CB_MMIO_MODE;
	} else if (data->trans_method & NSP32_TRANSFER_PIO) {
		command |= CB_IO_MODE;
	}
	nsp32_write2(base, TRANSFER_CONTROL, command);

	/*
	 * start AUTO SCSI, kick off arbitration
	 */
	command = (CLEAR_CDB_FIFO_POINTER |
		   AUTOSCSI_START         |
		   AUTO_MSGIN_00_OR_04    |
		   AUTO_MSGIN_02          |
		   AUTO_ATN                );
	nsp32_write2(base, COMMAND_CONTROL, command);

	/*
	 * Check arbitration
	 */
	status = nsp32_arbitration(SCpnt, base);

 out:
	/*
	 * IRQ enable
	 */
	nsp32_write2(base, IRQ_CONTROL, 0);

	return status;
}


/*
 * Arbitration Status Check
 *	
 * Note: Arbitration counter is waited during ARBIT_GO is not lifting.
 *	 Using udelay(1) consumes CPU time and system time, but 
 *	 arbitration delay time is defined minimal 2.4us in SCSI
 *	 specification, thus udelay works as coarse grained wait timer.
 */
static int nsp32_arbitration(struct scsi_cmnd *SCpnt, unsigned int base)
{
	unsigned char arbit;
	int	      status = TRUE;
	int	      time   = 0;

	do {
		arbit = nsp32_read1(base, ARBIT_STATUS);
		time++;
	} while ((arbit & (ARBIT_WIN | ARBIT_FAIL)) == 0 &&
		 (time <= ARBIT_TIMEOUT_TIME));

	nsp32_dbg(NSP32_DEBUG_AUTOSCSI,
		  "arbit: 0x%x, delay time: %d", arbit, time);

	if (arbit & ARBIT_WIN) {
		/* Arbitration succeeded */
		SCpnt->result = DID_OK << 16;
		nsp32_index_write1(base, EXT_PORT, LED_ON); /* PCI LED on */
	} else if (arbit & ARBIT_FAIL) {
		/* Arbitration failed */
		SCpnt->result = DID_BUS_BUSY << 16;
		status = FALSE;
	} else {
		/*
		 * unknown error or ARBIT_GO timeout,
		 * something lock up! guess no connection.
		 */
		nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "arbit timeout");
		SCpnt->result = DID_NO_CONNECT << 16;
		status = FALSE;
        }

	/*
	 * clear Arbit
	 */
	nsp32_write1(base, SET_ARBIT, ARBIT_CLEAR);

	return status;
}


/*
 * reselection
 *
 * Note: This reselection routine is called from msgin_occur,
 *	 reselection target id&lun must be already set.
 *	 SCSI-2 says IDENTIFY implies RESTORE_POINTER operation.
 */
static int nsp32_reselection(struct scsi_cmnd *SCpnt, unsigned char newlun)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int   host_id = SCpnt->device->host->this_id;
	unsigned int   base    = SCpnt->device->host->io_port;
	unsigned char  tmpid, newid;

	nsp32_dbg(NSP32_DEBUG_RESELECTION, "enter");

	/*
	 * calculate reselected SCSI ID
	 */
	tmpid = nsp32_read1(base, RESELECT_ID);
	tmpid &= (~BIT(host_id));
	newid = 0;
	while (tmpid) {
		if (tmpid & 1) {
			break;
		}
		tmpid >>= 1;
		newid++;
	}

	/*
	 * If reselected New ID:LUN is not existed
	 * or current nexus is not existed, unexpected
	 * reselection is occurred. Send reject message.
	 */
	if (newid >= ARRAY_SIZE(data->lunt) || newlun >= ARRAY_SIZE(data->lunt[0])) {
		nsp32_msg(KERN_WARNING, "unknown id/lun");
		return FALSE;
	} else if(data->lunt[newid][newlun].SCpnt == NULL) {
		nsp32_msg(KERN_WARNING, "no SCSI command is processing");
		return FALSE;
	}

	data->cur_id    = newid;
	data->cur_lun   = newlun;
	data->cur_target = &(data->target[newid]);
	data->cur_lunt   = &(data->lunt[newid][newlun]);

	/* reset SACK/SavedACK counter (or ALL clear?) */
	nsp32_write4(base, CLR_COUNTER, CLRCOUNTER_ALLMASK);

	return TRUE;
}


/*
 * nsp32_setup_sg_table - build scatter gather list for transfer data
 *			    with bus master.
 *
 * Note: NinjaSCSI-32Bi/UDE bus master can not transfer over 64KB at a time.
 */
static int nsp32_setup_sg_table(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	struct scatterlist *sg;
	nsp32_sgtable *sgt = data->cur_lunt->sglun->sgt;
	int num, i;
	u32_le l;

	if (sgt == NULL) {
		nsp32_dbg(NSP32_DEBUG_SGLIST, "SGT == null");
		return FALSE;
	}

	num = scsi_dma_map(SCpnt);
	if (!num)
		return TRUE;
	else if (num < 0)
		return FALSE;
	else {
		scsi_for_each_sg(SCpnt, sg, num, i) {
			/*
			 * Build nsp32_sglist, substitute sg dma addresses.
			 */
			sgt[i].addr = cpu_to_le32(sg_dma_address(sg));
			sgt[i].len  = cpu_to_le32(sg_dma_len(sg));

			if (le32_to_cpu(sgt[i].len) > 0x10000) {
				nsp32_msg(KERN_ERR,
					"can't transfer over 64KB at a time, size=0x%lx", le32_to_cpu(sgt[i].len));
				return FALSE;
			}
			nsp32_dbg(NSP32_DEBUG_SGLIST,
				  "num 0x%x : addr 0x%lx len 0x%lx",
				  i,
				  le32_to_cpu(sgt[i].addr),
				  le32_to_cpu(sgt[i].len ));
		}

		/* set end mark */
		l = le32_to_cpu(sgt[num-1].len);
		sgt[num-1].len = cpu_to_le32(l | SGTEND);
	}

	return TRUE;
}

static int nsp32_queuecommand(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *))
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	nsp32_target *target;
	nsp32_lunt   *cur_lunt;
	int ret;

	nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
		  "enter. target: 0x%x LUN: 0x%x cmnd: 0x%x cmndlen: 0x%x "
		  "use_sg: 0x%x reqbuf: 0x%lx reqlen: 0x%x",
		  SCpnt->device->id, SCpnt->device->lun, SCpnt->cmnd[0], SCpnt->cmd_len,
		  scsi_sg_count(SCpnt), scsi_sglist(SCpnt), scsi_bufflen(SCpnt));

	if (data->CurrentSC != NULL) {
		nsp32_msg(KERN_ERR, "Currentsc != NULL. Cancel this command request");
		data->CurrentSC = NULL;
		SCpnt->result   = DID_NO_CONNECT << 16;
		done(SCpnt);
		return 0;
	}

	/* check target ID is not same as this initiator ID */
	if (scmd_id(SCpnt) == SCpnt->device->host->this_id) {
		nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "terget==host???");
		SCpnt->result = DID_BAD_TARGET << 16;
		done(SCpnt);
		return 0;
	}

	/* check target LUN is allowable value */
	if (SCpnt->device->lun >= MAX_LUN) {
		nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "no more lun");
		SCpnt->result = DID_BAD_TARGET << 16;
		done(SCpnt);
		return 0;
	}

	show_command(SCpnt);

	SCpnt->scsi_done     = done;
	data->CurrentSC      = SCpnt;
	SCpnt->SCp.Status    = CHECK_CONDITION;
	SCpnt->SCp.Message   = 0;
	scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));

	SCpnt->SCp.ptr		    = (char *)scsi_sglist(SCpnt);
	SCpnt->SCp.this_residual    = scsi_bufflen(SCpnt);
	SCpnt->SCp.buffer	    = NULL;
	SCpnt->SCp.buffers_residual = 0;

	/* initialize data */
	data->msgout_len	= 0;
	data->msgin_len		= 0;
	cur_lunt		= &(data->lunt[SCpnt->device->id][SCpnt->device->lun]);
	cur_lunt->SCpnt		= SCpnt;
	cur_lunt->save_datp	= 0;
	cur_lunt->msgin03	= FALSE;
	data->cur_lunt		= cur_lunt;
	data->cur_id		= SCpnt->device->id;
	data->cur_lun		= SCpnt->device->lun;

	ret = nsp32_setup_sg_table(SCpnt);
	if (ret == FALSE) {
		nsp32_msg(KERN_ERR, "SGT fail");
		SCpnt->result = DID_ERROR << 16;
		nsp32_scsi_done(SCpnt);
		return 0;
	}

	/* Build IDENTIFY */
	nsp32_build_identify(SCpnt);

	/* 
	 * If target is the first time to transfer after the reset
	 * (target don't have SDTR_DONE and SDTR_INITIATOR), sync
	 * message SDTR is needed to do synchronous transfer.
	 */
	target = &data->target[scmd_id(SCpnt)];
	data->cur_target = target;

	if (!(target->sync_flag & (SDTR_DONE | SDTR_INITIATOR | SDTR_TARGET))) {
		unsigned char period, offset;

		if (trans_mode != ASYNC_MODE) {
			nsp32_set_max_sync(data, target, &period, &offset);
			nsp32_build_sdtr(SCpnt, period, offset);
			target->sync_flag |= SDTR_INITIATOR;
		} else {
			nsp32_set_async(data, target);
			target->sync_flag |= SDTR_DONE;
		}

		nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
			  "SDTR: entry: %d start_period: 0x%x offset: 0x%x\n",
			  target->limit_entry, period, offset);
	} else if (target->sync_flag & SDTR_INITIATOR) {
		/*
		 * It was negotiating SDTR with target, sending from the
		 * initiator, but there are no chance to remove this flag.
		 * Set async because we don't get proper negotiation.
		 */
		nsp32_set_async(data, target);
		target->sync_flag &= ~SDTR_INITIATOR;
		target->sync_flag |= SDTR_DONE;

		nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
			  "SDTR_INITIATOR: fall back to async");
	} else if (target->sync_flag & SDTR_TARGET) {
		/*
		 * It was negotiating SDTR with target, sending from target,
		 * but there are no chance to remove this flag.  Set async
		 * because we don't get proper negotiation.
		 */
		nsp32_set_async(data, target);
		target->sync_flag &= ~SDTR_TARGET;
		target->sync_flag |= SDTR_DONE;

		nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND,
			  "Unknown SDTR from target is reached, fall back to async.");
	}

	nsp32_dbg(NSP32_DEBUG_TARGETFLAG,
		  "target: %d sync_flag: 0x%x syncreg: 0x%x ackwidth: 0x%x",
		  SCpnt->device->id, target->sync_flag, target->syncreg,
		  target->ackwidth);

	/* Selection */
	if (auto_param == 0) {
		ret = nsp32_selection_autopara(SCpnt);
	} else {
		ret = nsp32_selection_autoscsi(SCpnt);
	}

	if (ret != TRUE) {
		nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "selection fail");
		nsp32_scsi_done(SCpnt);
	}

	return 0;
}

/* initialize asic */
static int nsp32hw_init(nsp32_hw_data *data)
{
	unsigned int   base = data->BaseAddress;
	unsigned short irq_stat;
	unsigned long  lc_reg;
	unsigned char  power;

	lc_reg = nsp32_index_read4(base, CFG_LATE_CACHE);
	if ((lc_reg & 0xff00) == 0) {
		lc_reg |= (0x20 << 8);
		nsp32_index_write2(base, CFG_LATE_CACHE, lc_reg & 0xffff);
	}

	nsp32_write2(base, IRQ_CONTROL,        IRQ_CONTROL_ALL_IRQ_MASK);
	nsp32_write2(base, TRANSFER_CONTROL,   0);
	nsp32_write4(base, BM_CNT,             0);
	nsp32_write2(base, SCSI_EXECUTE_PHASE, 0);

	do {
		irq_stat = nsp32_read2(base, IRQ_STATUS);
		nsp32_dbg(NSP32_DEBUG_INIT, "irq_stat 0x%x", irq_stat);
	} while (irq_stat & IRQSTATUS_ANY_IRQ);

	/*
	 * Fill FIFO_FULL_SHLD, FIFO_EMPTY_SHLD. Below parameter is
	 *  designated by specification.
	 */
	if ((data->trans_method & NSP32_TRANSFER_PIO) ||
	    (data->trans_method & NSP32_TRANSFER_MMIO)) {
		nsp32_index_write1(base, FIFO_FULL_SHLD_COUNT,  0x40);
		nsp32_index_write1(base, FIFO_EMPTY_SHLD_COUNT, 0x40);
	} else if (data->trans_method & NSP32_TRANSFER_BUSMASTER) {
		nsp32_index_write1(base, FIFO_FULL_SHLD_COUNT,  0x10);
		nsp32_index_write1(base, FIFO_EMPTY_SHLD_COUNT, 0x60);
	} else {
		nsp32_dbg(NSP32_DEBUG_INIT, "unknown transfer mode");
	}

	nsp32_dbg(NSP32_DEBUG_INIT, "full 0x%x emp 0x%x",
		  nsp32_index_read1(base, FIFO_FULL_SHLD_COUNT),
		  nsp32_index_read1(base, FIFO_EMPTY_SHLD_COUNT));

	nsp32_index_write1(base, CLOCK_DIV, data->clock);
	nsp32_index_write1(base, BM_CYCLE,  MEMRD_CMD1 | SGT_AUTO_PARA_MEMED_CMD);
	nsp32_write1(base, PARITY_CONTROL, 0);	/* parity check is disable */

	/*
	 * initialize MISC_WRRD register
	 * 
	 * Note: Designated parameters is obeyed as following:
	 *	MISC_SCSI_DIRECTION_DETECTOR_SELECT: It must be set.
	 *	MISC_MASTER_TERMINATION_SELECT:      It must be set.
	 *	MISC_BMREQ_NEGATE_TIMING_SEL:	     It should be set.
	 *	MISC_AUTOSEL_TIMING_SEL:	     It should be set.
	 *	MISC_BMSTOP_CHANGE2_NONDATA_PHASE:   It should be set.
	 *	MISC_DELAYED_BMSTART:		     It's selected for safety.
	 *
	 * Note: If MISC_BMSTOP_CHANGE2_NONDATA_PHASE is set, then
	 *	we have to set TRANSFERCONTROL_BM_START as 0 and set
	 *	appropriate value before restarting bus master transfer.
	 */
	nsp32_index_write2(base, MISC_WR,
			   (SCSI_DIRECTION_DETECTOR_SELECT |
			    DELAYED_BMSTART                |
			    MASTER_TERMINATION_SELECT      |
			    BMREQ_NEGATE_TIMING_SEL        |
			    AUTOSEL_TIMING_SEL             |
			    BMSTOP_CHANGE2_NONDATA_PHASE));

	nsp32_index_write1(base, TERM_PWR_CONTROL, 0);
	power = nsp32_index_read1(base, TERM_PWR_CONTROL);
	if (!(power & SENSE)) {
		nsp32_msg(KERN_INFO, "term power on");
		nsp32_index_write1(base, TERM_PWR_CONTROL, BPWR);
	}

	nsp32_write2(base, TIMER_SET, TIMER_STOP);
	nsp32_write2(base, TIMER_SET, TIMER_STOP); /* Required 2 times */

	nsp32_write1(base, SYNC_REG,     0);
	nsp32_write1(base, ACK_WIDTH,    0);
	nsp32_write2(base, SEL_TIME_OUT, SEL_TIMEOUT_TIME);

	/*
	 * enable to select designated IRQ (except for
	 * IRQSELECT_SERR, IRQSELECT_PERR, IRQSELECT_BMCNTERR)
	 */
	nsp32_index_write2(base, IRQ_SELECT, IRQSELECT_TIMER_IRQ         |
			                     IRQSELECT_SCSIRESET_IRQ     |
			                     IRQSELECT_FIFO_SHLD_IRQ     |
			                     IRQSELECT_RESELECT_IRQ      |
			                     IRQSELECT_PHASE_CHANGE_IRQ  |
			                     IRQSELECT_AUTO_SCSI_SEQ_IRQ |
			                  //   IRQSELECT_BMCNTERR_IRQ      |
			                     IRQSELECT_TARGET_ABORT_IRQ  |
			                     IRQSELECT_MASTER_ABORT_IRQ );
	nsp32_write2(base, IRQ_CONTROL, 0);

	/* PCI LED off */
	nsp32_index_write1(base, EXT_PORT_DDR, LED_OFF);
	nsp32_index_write1(base, EXT_PORT,     LED_OFF);

	return TRUE;
}


/* interrupt routine */
static irqreturn_t do_nsp32_isr(int irq, void *dev_id)
{
	nsp32_hw_data *data = dev_id;
	unsigned int base = data->BaseAddress;
	struct scsi_cmnd *SCpnt = data->CurrentSC;
	unsigned short auto_stat, irq_stat, trans_stat;
	unsigned char busmon, busphase;
	unsigned long flags;
	int ret;
	int handled = 0;
	struct Scsi_Host *host = data->Host;

	spin_lock_irqsave(host->host_lock, flags);

	/*
	 * IRQ check, then enable IRQ mask
	 */
	irq_stat = nsp32_read2(base, IRQ_STATUS);
	nsp32_dbg(NSP32_DEBUG_INTR, 
		  "enter IRQ: %d, IRQstatus: 0x%x", irq, irq_stat);
	/* is this interrupt comes from Ninja asic? */
	if ((irq_stat & IRQSTATUS_ANY_IRQ) == 0) {
		nsp32_dbg(NSP32_DEBUG_INTR, "shared interrupt: irq other 0x%x", irq_stat);
		goto out2;
	}
	handled = 1;
	nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);

	busmon = nsp32_read1(base, SCSI_BUS_MONITOR);
	busphase = busmon & BUSMON_PHASE_MASK;

	trans_stat = nsp32_read2(base, TRANSFER_STATUS);
	if ((irq_stat == 0xffff) && (trans_stat == 0xffff)) {
		nsp32_msg(KERN_INFO, "card disconnect");
		if (data->CurrentSC != NULL) {
			nsp32_msg(KERN_INFO, "clean up current SCSI command");
			SCpnt->result = DID_BAD_TARGET << 16;
			nsp32_scsi_done(SCpnt);
		}
		goto out;
	}

	/* Timer IRQ */
	if (irq_stat & IRQSTATUS_TIMER_IRQ) {
		nsp32_dbg(NSP32_DEBUG_INTR, "timer stop");
		nsp32_write2(base, TIMER_SET, TIMER_STOP);
		goto out;
	}

	/* SCSI reset */
	if (irq_stat & IRQSTATUS_SCSIRESET_IRQ) {
		nsp32_msg(KERN_INFO, "detected someone do bus reset");
		nsp32_do_bus_reset(data);
		if (SCpnt != NULL) {
			SCpnt->result = DID_RESET << 16;
			nsp32_scsi_done(SCpnt);
		}
		goto out;
	}

	if (SCpnt == NULL) {
		nsp32_msg(KERN_WARNING, "SCpnt==NULL this can't be happened");
		nsp32_msg(KERN_WARNING, "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat);
		goto out;
	}

	/*
	 * AutoSCSI Interrupt.
	 * Note: This interrupt is occurred when AutoSCSI is finished.  Then
	 * check SCSIEXECUTEPHASE, and do appropriate action.  Each phases are
	 * recorded when AutoSCSI sequencer has been processed.
	 */
	if(irq_stat & IRQSTATUS_AUTOSCSI_IRQ) {
		/* getting SCSI executed phase */
		auto_stat = nsp32_read2(base, SCSI_EXECUTE_PHASE);
		nsp32_write2(base, SCSI_EXECUTE_PHASE, 0);

		/* Selection Timeout, go busfree phase. */
		if (auto_stat & SELECTION_TIMEOUT) {
			nsp32_dbg(NSP32_DEBUG_INTR,
				  "selection timeout occurred");

			SCpnt->result = DID_TIME_OUT << 16;
			nsp32_scsi_done(SCpnt);
			goto out;
		}

		if (auto_stat & MSGOUT_PHASE) {
			/*
			 * MsgOut phase was processed.
			 * If MSG_IN_OCCUER is not set, then MsgOut phase is
			 * completed. Thus, msgout_len must reset.  Otherwise,
			 * nothing to do here. If MSG_OUT_OCCUER is occurred,
			 * then we will encounter the condition and check.
			 */
			if (!(auto_stat & MSG_IN_OCCUER) &&
			     (data->msgout_len <= 3)) {
				/*
				 * !MSG_IN_OCCUER && msgout_len <=3
				 *   ---> AutoSCSI with MSGOUTreg is processed.
				 */
				data->msgout_len = 0;
			};

			nsp32_dbg(NSP32_DEBUG_INTR, "MsgOut phase processed");
		}

		if ((auto_stat & DATA_IN_PHASE) &&
		    (scsi_get_resid(SCpnt) > 0) &&
		    ((nsp32_read2(base, FIFO_REST_CNT) & FIFO_REST_MASK) != 0)) {
			printk( "auto+fifo\n");
			//nsp32_pio_read(SCpnt);
		}

		if (auto_stat & (DATA_IN_PHASE | DATA_OUT_PHASE)) {
			/* DATA_IN_PHASE/DATA_OUT_PHASE was processed. */
			nsp32_dbg(NSP32_DEBUG_INTR,
				  "Data in/out phase processed");

			/* read BMCNT, SGT pointer addr */
			nsp32_dbg(NSP32_DEBUG_INTR, "BMCNT=0x%lx", 
				    nsp32_read4(base, BM_CNT));
			nsp32_dbg(NSP32_DEBUG_INTR, "addr=0x%lx", 
				    nsp32_read4(base, SGT_ADR));
			nsp32_dbg(NSP32_DEBUG_INTR, "SACK=0x%lx", 
				    nsp32_read4(base, SACK_CNT));
			nsp32_dbg(NSP32_DEBUG_INTR, "SSACK=0x%lx", 
				    nsp32_read4(base, SAVED_SACK_CNT));

			scsi_set_resid(SCpnt, 0); /* all data transfered! */
		}

		/*
		 * MsgIn Occur
		 */
		if (auto_stat & MSG_IN_OCCUER) {
			nsp32_msgin_occur(SCpnt, irq_stat, auto_stat);
		}

		/*
		 * MsgOut Occur
		 */
		if (auto_stat & MSG_OUT_OCCUER) {
			nsp32_msgout_occur(SCpnt);
		}

		/*
		 * Bus Free Occur
		 */
		if (auto_stat & BUS_FREE_OCCUER) {
			ret = nsp32_busfree_occur(SCpnt, auto_stat);
			if (ret == TRUE) {
				goto out;
			}
		}

		if (auto_stat & STATUS_PHASE) {
			/*
			 * Read CSB and substitute CSB for SCpnt->result
			 * to save status phase stutas byte.
			 * scsi error handler checks host_byte (DID_*:
			 * low level driver to indicate status), then checks 
			 * status_byte (SCSI status byte).
			 */
			SCpnt->result =	(int)nsp32_read1(base, SCSI_CSB_IN);
		}

		if (auto_stat & ILLEGAL_PHASE) {
			/* Illegal phase is detected. SACK is not back. */
			nsp32_msg(KERN_WARNING, 
				  "AUTO SCSI ILLEGAL PHASE OCCUR!!!!");

			/* TODO: currently we don't have any action... bus reset? */

			/*
			 * To send back SACK, assert, wait, and negate.
			 */
			nsp32_sack_assert(data);
			nsp32_wait_req(data, NEGATE);
			nsp32_sack_negate(data);

		}

		if (auto_stat & COMMAND_PHASE) {
			/* nothing to do */
			nsp32_dbg(NSP32_DEBUG_INTR, "Command phase processed");
		}

		if (auto_stat & AUTOSCSI_BUSY) {
			/* AutoSCSI is running */
		}

		show_autophase(auto_stat);
	}

	/* FIFO_SHLD_IRQ */
	if (irq_stat & IRQSTATUS_FIFO_SHLD_IRQ) {
		nsp32_dbg(NSP32_DEBUG_INTR, "FIFO IRQ");

		switch(busphase) {
		case BUSPHASE_DATA_OUT:
			nsp32_dbg(NSP32_DEBUG_INTR, "fifo/write");

			//nsp32_pio_write(SCpnt);

			break;

		case BUSPHASE_DATA_IN:
			nsp32_dbg(NSP32_DEBUG_INTR, "fifo/read");

			//nsp32_pio_read(SCpnt);

			break;

		case BUSPHASE_STATUS:
			nsp32_dbg(NSP32_DEBUG_INTR, "fifo/status");

			SCpnt->SCp.Status = nsp32_read1(base, SCSI_CSB_IN);

			break;
		default:
			nsp32_dbg(NSP32_DEBUG_INTR, "fifo/other phase");
			nsp32_dbg(NSP32_DEBUG_INTR, "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat);
			show_busphase(busphase);
			break;
		}

		goto out;
	}

	/* Phase Change IRQ */
	if (irq_stat & IRQSTATUS_PHASE_CHANGE_IRQ) {
		nsp32_dbg(NSP32_DEBUG_INTR, "phase change IRQ");

		switch(busphase) {
		case BUSPHASE_MESSAGE_IN:
			nsp32_dbg(NSP32_DEBUG_INTR, "phase chg/msg in");
			nsp32_msgin_occur(SCpnt, irq_stat, 0);
			break;
		default:
			nsp32_msg(KERN_WARNING, "phase chg/other phase?");
			nsp32_msg(KERN_WARNING, "irq_stat=0x%x trans_stat=0x%x\n",
				  irq_stat, trans_stat);
			show_busphase(busphase);
			break;
		}
		goto out;
	}

	/* PCI_IRQ */
	if (irq_stat & IRQSTATUS_PCI_IRQ) {
		nsp32_dbg(NSP32_DEBUG_INTR, "PCI IRQ occurred");
		/* Do nothing */
	}

	/* BMCNTERR_IRQ */
	if (irq_stat & IRQSTATUS_BMCNTERR_IRQ) {
		nsp32_msg(KERN_ERR, "Received unexpected BMCNTERR IRQ! ");
		/*
		 * TODO: To be implemented improving bus master
		 * transfer reliablity when BMCNTERR is occurred in
		 * AutoSCSI phase described in specification.
		 */
	}

#if 0
	nsp32_dbg(NSP32_DEBUG_INTR,
		  "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat);
	show_busphase(busphase);
#endif

 out:
	/* disable IRQ mask */
	nsp32_write2(base, IRQ_CONTROL, 0);

 out2:
	spin_unlock_irqrestore(host->host_lock, flags);

	nsp32_dbg(NSP32_DEBUG_INTR, "exit");

	return IRQ_RETVAL(handled);
}

#undef SPRINTF
#define SPRINTF(args...) \
	do { \
		if(length > (pos - buffer)) { \
			pos += snprintf(pos, length - (pos - buffer) + 1, ## args); \
			nsp32_dbg(NSP32_DEBUG_PROC, "buffer=0x%p pos=0x%p length=%d %d\n", buffer, pos, length,  length - (pos - buffer));\
		} \
	} while(0)

static int nsp32_proc_info(struct Scsi_Host *host, char *buffer, char **start,
			   off_t offset, int length, int inout)
{
	char             *pos = buffer;
	int               thislength;
	unsigned long     flags;
	nsp32_hw_data    *data;
	int               hostno;
	unsigned int      base;
	unsigned char     mode_reg;
	int               id, speed;
	long              model;

	/* Write is not supported, just return. */
	if (inout == TRUE) {
		return -EINVAL;
	}

	hostno = host->host_no;
	data = (nsp32_hw_data *)host->hostdata;
	base = host->io_port;

	SPRINTF("NinjaSCSI-32 status\n\n");
	SPRINTF("Driver version:        %s, $Revision: 1.33 $\n", nsp32_release_version);
	SPRINTF("SCSI host No.:         %d\n",		hostno);
	SPRINTF("IRQ:                   %d\n",		host->irq);
	SPRINTF("IO:                    0x%lx-0x%lx\n", host->io_port, host->io_port + host->n_io_port - 1);
	SPRINTF("MMIO(virtual address): 0x%lx-0x%lx\n",	host->base, host->base + data->MmioLength - 1);
	SPRINTF("sg_tablesize:          %d\n",		host->sg_tablesize);
	SPRINTF("Chip revision:         0x%x\n",       	(nsp32_read2(base, INDEX_REG) >> 8) & 0xff);

	mode_reg = nsp32_index_read1(base, CHIP_MODE);
	model    = data->pci_devid->driver_data;

#ifdef CONFIG_PM
	SPRINTF("Power Management:      %s\n",          (mode_reg & OPTF) ? "yes" : "no");
#endif
	SPRINTF("OEM:                   %ld, %s\n",     (mode_reg & (OEM0|OEM1)), nsp32_model[model]);

	spin_lock_irqsave(&(data->Lock), flags);
	SPRINTF("CurrentSC:             0x%p\n\n",      data->CurrentSC);
	spin_unlock_irqrestore(&(data->Lock), flags);


	SPRINTF("SDTR status\n");
	for (id = 0; id < ARRAY_SIZE(data->target); id++) {

                SPRINTF("id %d: ", id);

		if (id == host->this_id) {
			SPRINTF("----- NinjaSCSI-32 host adapter\n");
			continue;
		}

		if (data->target[id].sync_flag == SDTR_DONE) {
			if (data->target[id].period == 0            &&
			    data->target[id].offset == ASYNC_OFFSET ) {
				SPRINTF("async");
			} else {
				SPRINTF(" sync");
			}
		} else {
			SPRINTF(" none");
		}

		if (data->target[id].period != 0) {

			speed = 1000000 / (data->target[id].period * 4);

			SPRINTF(" transfer %d.%dMB/s, offset %d",
				speed / 1000,
				speed % 1000,
				data->target[id].offset
				);
		}
		SPRINTF("\n");
	}


	thislength = pos - (buffer + offset);

	if(thislength < 0) {
		*start = NULL;
                return 0;
        }


	thislength = min(thislength, length);
	*start = buffer + offset;

	return thislength;
}
#undef SPRINTF



/*
 * Reset parameters and call scsi_done for data->cur_lunt.
 * Be careful setting SCpnt->result = DID_* before calling this function.
 */
static void nsp32_scsi_done(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int   base = SCpnt->device->host->io_port;

	scsi_dma_unmap(SCpnt);

	/*
	 * clear TRANSFERCONTROL_BM_START
	 */
	nsp32_write2(base, TRANSFER_CONTROL, 0);
	nsp32_write4(base, BM_CNT,           0);

	/*
	 * call scsi_done
	 */
	(*SCpnt->scsi_done)(SCpnt);

	/*
	 * reset parameters
	 */
	data->cur_lunt->SCpnt = NULL;
	data->cur_lunt        = NULL;
	data->cur_target      = NULL;
	data->CurrentSC      = NULL;
}


/*
 * Bus Free Occur
 *
 * Current Phase is BUSFREE. AutoSCSI is automatically execute BUSFREE phase
 * with ACK reply when below condition is matched:
 *	MsgIn 00: Command Complete.
 *	MsgIn 02: Save Data Pointer.
 *	MsgIn 04: Diconnect.
 * In other case, unexpected BUSFREE is detected.
 */
static int nsp32_busfree_occur(struct scsi_cmnd *SCpnt, unsigned short execph)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int base   = SCpnt->device->host->io_port;

	nsp32_dbg(NSP32_DEBUG_BUSFREE, "enter execph=0x%x", execph);
	show_autophase(execph);

	nsp32_write4(base, BM_CNT,           0);
	nsp32_write2(base, TRANSFER_CONTROL, 0);

	/*
	 * MsgIn 02: Save Data Pointer
	 *
	 * VALID:
	 *   Save Data Pointer is received. Adjust pointer.
	 *   
	 * NO-VALID:
	 *   SCSI-3 says if Save Data Pointer is not received, then we restart
	 *   processing and we can't adjust any SCSI data pointer in next data
	 *   phase.
	 */
	if (execph & MSGIN_02_VALID) {
		nsp32_dbg(NSP32_DEBUG_BUSFREE, "MsgIn02_Valid");

		/*
		 * Check sack_cnt/saved_sack_cnt, then adjust sg table if
		 * needed.
		 */
		if (!(execph & MSGIN_00_VALID) && 
		    ((execph & DATA_IN_PHASE) || (execph & DATA_OUT_PHASE))) {
			unsigned int sacklen, s_sacklen;

			/*
			 * Read SACK count and SAVEDSACK count, then compare.
			 */
			sacklen   = nsp32_read4(base, SACK_CNT      );
			s_sacklen = nsp32_read4(base, SAVED_SACK_CNT);

			/*
			 * If SAVEDSACKCNT == 0, it means SavedDataPointer is
			 * come after data transfering.
			 */
			if (s_sacklen > 0) {
				/*
				 * Comparing between sack and savedsack to
				 * check the condition of AutoMsgIn03.
				 *
				 * If they are same, set msgin03 == TRUE,
				 * COMMANDCONTROL_AUTO_MSGIN_03 is enabled at
				 * reselection.  On the other hand, if they
				 * aren't same, set msgin03 == FALSE, and
				 * COMMANDCONTROL_AUTO_MSGIN_03 is disabled at
				 * reselection.
				 */
				if (sacklen != s_sacklen) {
					data->cur_lunt->msgin03 = FALSE;
				} else {
					data->cur_lunt->msgin03 = TRUE;
				}

				nsp32_adjust_busfree(SCpnt, s_sacklen);
			}
		}

		/* This value has not substitude with valid value yet... */
		//data->cur_lunt->save_datp = data->cur_datp;
	} else {
		/*
		 * no processing.
		 */
	}
	
	if (execph & MSGIN_03_VALID) {
		/* MsgIn03 was valid to be processed. No need processing. */
	}

	/*
	 * target SDTR check
	 */
	if (data->cur_target->sync_flag & SDTR_INITIATOR) {
		/*
		 * SDTR negotiation pulled by the initiator has not
		 * finished yet. Fall back to ASYNC mode.
		 */
		nsp32_set_async(data, data->cur_target);
		data->cur_target->sync_flag &= ~SDTR_INITIATOR;
		data->cur_target->sync_flag |= SDTR_DONE;
	} else if (data->cur_target->sync_flag & SDTR_TARGET) {
		/*
		 * SDTR negotiation pulled by the target has been
		 * negotiating.
		 */
		if (execph & (MSGIN_00_VALID | MSGIN_04_VALID)) {
			/* 
			 * If valid message is received, then
			 * negotiation is succeeded.
			 */
		} else {
			/*
			 * On the contrary, if unexpected bus free is
			 * occurred, then negotiation is failed. Fall
			 * back to ASYNC mode.
			 */
			nsp32_set_async(data, data->cur_target);
		}
		data->cur_target->sync_flag &= ~SDTR_TARGET;
		data->cur_target->sync_flag |= SDTR_DONE;
	}

	/*
	 * It is always ensured by SCSI standard that initiator
	 * switches into Bus Free Phase after
	 * receiving message 00 (Command Complete), 04 (Disconnect).
	 * It's the reason that processing here is valid.
	 */
	if (execph & MSGIN_00_VALID) {
		/* MsgIn 00: Command Complete */
		nsp32_dbg(NSP32_DEBUG_BUSFREE, "command complete");

		SCpnt->SCp.Status  = nsp32_read1(base, SCSI_CSB_IN);
		SCpnt->SCp.Message = 0;
		nsp32_dbg(NSP32_DEBUG_BUSFREE, 
			  "normal end stat=0x%x resid=0x%x\n",
			  SCpnt->SCp.Status, scsi_get_resid(SCpnt));
		SCpnt->result = (DID_OK             << 16) |
			        (SCpnt->SCp.Message <<  8) |
			        (SCpnt->SCp.Status  <<  0);
		nsp32_scsi_done(SCpnt);
		/* All operation is done */
		return TRUE;
	} else if (execph & MSGIN_04_VALID) {
		/* MsgIn 04: Disconnect */
		SCpnt->SCp.Status  = nsp32_read1(base, SCSI_CSB_IN);
		SCpnt->SCp.Message = 4;
		
		nsp32_dbg(NSP32_DEBUG_BUSFREE, "disconnect");
		return TRUE;
	} else {
		/* Unexpected bus free */
		nsp32_msg(KERN_WARNING, "unexpected bus free occurred");

		/* DID_ERROR? */
		//SCpnt->result   = (DID_OK << 16) | (SCpnt->SCp.Message << 8) | (SCpnt->SCp.Status << 0);
		SCpnt->result = DID_ERROR << 16;
		nsp32_scsi_done(SCpnt);
		return TRUE;
	}
	return FALSE;
}


/*
 * nsp32_adjust_busfree - adjusting SG table
 *
 * Note: This driver adjust the SG table using SCSI ACK
 *       counter instead of BMCNT counter!
 */
static void nsp32_adjust_busfree(struct scsi_cmnd *SCpnt, unsigned int s_sacklen)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	int                   old_entry = data->cur_entry;
	int                   new_entry;
	int                   sg_num = data->cur_lunt->sg_num;
	nsp32_sgtable *sgt    = data->cur_lunt->sglun->sgt;
	unsigned int          restlen, sentlen;
	u32_le                len, addr;

	nsp32_dbg(NSP32_DEBUG_SGLIST, "old resid=0x%x", scsi_get_resid(SCpnt));

	/* adjust saved SACK count with 4 byte start address boundary */
	s_sacklen -= le32_to_cpu(sgt[old_entry].addr) & 3;

	/*
	 * calculate new_entry from sack count and each sgt[].len 
	 * calculate the byte which is intent to send
	 */
	sentlen = 0;
	for (new_entry = old_entry; new_entry < sg_num; new_entry++) {
		sentlen += (le32_to_cpu(sgt[new_entry].len) & ~SGTEND);
		if (sentlen > s_sacklen) {
			break;
		}
	}

	/* all sgt is processed */
	if (new_entry == sg_num) {
		goto last;
	}

	if (sentlen == s_sacklen) {
		/* XXX: confirm it's ok or not */
		/* In this case, it's ok because we are at 
		   the head element of the sg. restlen is correctly calculated. */
	}

	/* calculate the rest length for transfering */
	restlen = sentlen - s_sacklen;

	/* update adjusting current SG table entry */
	len  = le32_to_cpu(sgt[new_entry].len);
	addr = le32_to_cpu(sgt[new_entry].addr);
	addr += (len - restlen);
	sgt[new_entry].addr = cpu_to_le32(addr);
	sgt[new_entry].len  = cpu_to_le32(restlen);

	/* set cur_entry with new_entry */
	data->cur_entry = new_entry;
 
	return;

 last:
	if (scsi_get_resid(SCpnt) < sentlen) {
		nsp32_msg(KERN_ERR, "resid underflow");
	}

	scsi_set_resid(SCpnt, scsi_get_resid(SCpnt) - sentlen);
	nsp32_dbg(NSP32_DEBUG_SGLIST, "new resid=0x%x", scsi_get_resid(SCpnt));

	/* update hostdata and lun */

	return;
}


/*
 * It's called MsgOut phase occur.
 * NinjaSCSI-32Bi/UDE automatically processes up to 3 messages in
 * message out phase. It, however, has more than 3 messages,
 * HBA creates the interrupt and we have to process by hand.
 */
static void nsp32_msgout_occur(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int base   = SCpnt->device->host->io_port;
	//unsigned short command;
	long new_sgtp;
	int i;
	
	nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR,
		  "enter: msgout_len: 0x%x", data->msgout_len);

	/*
	 * If MsgOut phase is occurred without having any
	 * message, then No_Operation is sent (SCSI-2).
	 */
	if (data->msgout_len == 0) {
		nsp32_build_nop(SCpnt);
	}

	/*
	 * Set SGTP ADDR current entry for restarting AUTOSCSI, 
	 * because SGTP is incremented next point.
	 * There is few statement in the specification...
	 */
 	new_sgtp = data->cur_lunt->sglun_paddr + 
		   (data->cur_lunt->cur_entry * sizeof(nsp32_sgtable));

	/*
	 * send messages
	 */
	for (i = 0; i < data->msgout_len; i++) {
		nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR,
			  "%d : 0x%x", i, data->msgoutbuf[i]);

		/*
		 * Check REQ is asserted.
		 */
		nsp32_wait_req(data, ASSERT);

		if (i == (data->msgout_len - 1)) {
			/*
			 * If the last message, set the AutoSCSI restart
			 * before send back the ack message. AutoSCSI
			 * restart automatically negate ATN signal.
			 */
			//command = (AUTO_MSGIN_00_OR_04 | AUTO_MSGIN_02);
			//nsp32_restart_autoscsi(SCpnt, command);
			nsp32_write2(base, COMMAND_CONTROL,
					 (CLEAR_CDB_FIFO_POINTER |
					  AUTO_COMMAND_PHASE     |
					  AUTOSCSI_RESTART       |
					  AUTO_MSGIN_00_OR_04    |
					  AUTO_MSGIN_02          ));
		}
		/*
		 * Write data with SACK, then wait sack is
		 * automatically negated.
		 */
		nsp32_write1(base, SCSI_DATA_WITH_ACK, data->msgoutbuf[i]);
		nsp32_wait_sack(data, NEGATE);

		nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, "bus: 0x%x\n",
			  nsp32_read1(base, SCSI_BUS_MONITOR));
	};

	data->msgout_len = 0;

	nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, "exit");
}

/*
 * Restart AutoSCSI
 *
 * Note: Restarting AutoSCSI needs set:
 *		SYNC_REG, ACK_WIDTH, SGT_ADR, TRANSFER_CONTROL
 */
static void nsp32_restart_autoscsi(struct scsi_cmnd *SCpnt, unsigned short command)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int   base = data->BaseAddress;
	unsigned short transfer = 0;

	nsp32_dbg(NSP32_DEBUG_RESTART, "enter");

	if (data->cur_target == NULL || data->cur_lunt == NULL) {
		nsp32_msg(KERN_ERR, "Target or Lun is invalid");
	}

	/*
	 * set SYNC_REG
	 * Don't set BM_START_ADR before setting this register.
	 */
	nsp32_write1(base, SYNC_REG, data->cur_target->syncreg);

	/*
	 * set ACKWIDTH
	 */
	nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth);

	/*
	 * set SREQ hazard killer sampling rate
	 */
	nsp32_write1(base, SREQ_SMPL_RATE, data->cur_target->sample_reg);

	/*
	 * set SGT ADDR (physical address)
	 */
	nsp32_write4(base, SGT_ADR, data->cur_lunt->sglun_paddr);

	/*
	 * set TRANSFER CONTROL REG
	 */
	transfer = 0;
	transfer |= (TRANSFER_GO | ALL_COUNTER_CLR);
	if (data->trans_method & NSP32_TRANSFER_BUSMASTER) {
		if (scsi_bufflen(SCpnt) > 0) {
			transfer |= BM_START;
		}
	} else if (data->trans_method & NSP32_TRANSFER_MMIO) {
		transfer |= CB_MMIO_MODE;
	} else if (data->trans_method & NSP32_TRANSFER_PIO) {
		transfer |= CB_IO_MODE;
	}
	nsp32_write2(base, TRANSFER_CONTROL, transfer);

	/*
	 * restart AutoSCSI
	 *
	 * TODO: COMMANDCONTROL_AUTO_COMMAND_PHASE is needed ?
	 */
	command |= (CLEAR_CDB_FIFO_POINTER |
		    AUTO_COMMAND_PHASE     |
		    AUTOSCSI_RESTART       );
	nsp32_write2(base, COMMAND_CONTROL, command);

	nsp32_dbg(NSP32_DEBUG_RESTART, "exit");
}


/*
 * cannot run automatically message in occur
 */
static void nsp32_msgin_occur(struct scsi_cmnd     *SCpnt,
			      unsigned long  irq_status,
			      unsigned short execph)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int   base = SCpnt->device->host->io_port;
	unsigned char  msg;
	unsigned char  msgtype;
	unsigned char  newlun;
	unsigned short command  = 0;
	int            msgclear = TRUE;
	long           new_sgtp;
	int            ret;

	/*
	 * read first message
	 *    Use SCSIDATA_W_ACK instead of SCSIDATAIN, because the procedure
	 *    of Message-In have to be processed before sending back SCSI ACK.
	 */
	msg = nsp32_read1(base, SCSI_DATA_IN);
	data->msginbuf[(unsigned char)data->msgin_len] = msg;
	msgtype = data->msginbuf[0];
	nsp32_dbg(NSP32_DEBUG_MSGINOCCUR,
		  "enter: msglen: 0x%x msgin: 0x%x msgtype: 0x%x",
		  data->msgin_len, msg, msgtype);

	/*
	 * TODO: We need checking whether bus phase is message in?
	 */

	/*
	 * assert SCSI ACK
	 */
	nsp32_sack_assert(data);

	/*
	 * processing IDENTIFY
	 */
	if (msgtype & 0x80) {
		if (!(irq_status & IRQSTATUS_RESELECT_OCCUER)) {
			/* Invalid (non reselect) phase */
			goto reject;
		}

		newlun = msgtype & 0x1f; /* TODO: SPI-3 compliant? */
		ret = nsp32_reselection(SCpnt, newlun);
		if (ret == TRUE) {
			goto restart;
		} else {
			goto reject;
		}
	}
	
	/*
	 * processing messages except for IDENTIFY
	 *
	 * TODO: Messages are all SCSI-2 terminology. SCSI-3 compliance is TODO.
	 */
	switch (msgtype) {
	/*
	 * 1-byte message
	 */
	case COMMAND_COMPLETE:
	case DISCONNECT:
		/*
		 * These messages should not be occurred.
		 * They should be processed on AutoSCSI sequencer.
		 */
		nsp32_msg(KERN_WARNING, 
			   "unexpected message of AutoSCSI MsgIn: 0x%x", msg);
		break;
		
	case RESTORE_POINTERS:
		/*
		 * AutoMsgIn03 is disabled, and HBA gets this message.
		 */

		if ((execph & DATA_IN_PHASE) || (execph & DATA_OUT_PHASE)) {
			unsigned int s_sacklen;

			s_sacklen = nsp32_read4(base, SAVED_SACK_CNT);
			if ((execph & MSGIN_02_VALID) && (s_sacklen > 0)) {
				nsp32_adjust_busfree(SCpnt, s_sacklen);
			} else {
				/* No need to rewrite SGT */
			}
		}
		data->cur_lunt->msgin03 = FALSE;

		/* Update with the new value */

		/* reset SACK/SavedACK counter (or ALL clear?) */
		nsp32_write4(base, CLR_COUNTER, CLRCOUNTER_ALLMASK);

		/*
		 * set new sg pointer
		 */
		new_sgtp = data->cur_lunt->sglun_paddr + 
			(data->cur_lunt->cur_entry * sizeof(nsp32_sgtable));
		nsp32_write4(base, SGT_ADR, new_sgtp);

		break;

	case SAVE_POINTERS:
		/*
		 * These messages should not be occurred.
		 * They should be processed on AutoSCSI sequencer.
		 */
		nsp32_msg (KERN_WARNING, 
			   "unexpected message of AutoSCSI MsgIn: SAVE_POINTERS");
		
		break;
		
	case MESSAGE_REJECT:
		/* If previous message_out is sending SDTR, and get 
		   message_reject from target, SDTR negotiation is failed */
		if (data->cur_target->sync_flag &
				(SDTR_INITIATOR | SDTR_TARGET)) {
			/*
			 * Current target is negotiating SDTR, but it's
			 * failed.  Fall back to async transfer mode, and set
			 * SDTR_DONE.
			 */
			nsp32_set_async(data, data->cur_target);
			data->cur_target->sync_flag &= ~SDTR_INITIATOR;
			data->cur_target->sync_flag |= SDTR_DONE;

		}
		break;

	case LINKED_CMD_COMPLETE:
	case LINKED_FLG_CMD_COMPLETE:
		/* queue tag is not supported currently */
		nsp32_msg (KERN_WARNING, 
			   "unsupported message: 0x%x", msgtype);
		break;

	case INITIATE_RECOVERY:
		/* staring ECA (Extended Contingent Allegiance) state. */
		/* This message is declined in SPI2 or later. */

		goto reject;

	/*
	 * 2-byte message
	 */
	case SIMPLE_QUEUE_TAG:
	case 0x23:
		/*
		 * 0x23: Ignore_Wide_Residue is not declared in scsi.h.
		 * No support is needed.
		 */
		if (data->msgin_len >= 1) {
			goto reject;
		}

		/* current position is 1-byte of 2 byte */
		msgclear = FALSE;

		break;

	/*
	 * extended message
	 */
	case EXTENDED_MESSAGE:
		if (data->msgin_len < 1) {
			/*
			 * Current position does not reach 2-byte
			 * (2-byte is extended message length).
			 */
			msgclear = FALSE;
			break;
		}

		if ((data->msginbuf[1] + 1) > data->msgin_len) {
			/*
			 * Current extended message has msginbuf[1] + 2
			 * (msgin_len starts counting from 0, so buf[1] + 1).
			 * If current message position is not finished,
			 * continue receiving message.
			 */
			msgclear = FALSE;
			break;
		}

		/*
		 * Reach here means regular length of each type of 
		 * extended messages.
		 */
		switch (data->msginbuf[2]) {
		case EXTENDED_MODIFY_DATA_POINTER:
			/* TODO */
			goto reject; /* not implemented yet */
			break;

		case EXTENDED_SDTR:
			/*
			 * Exchange this message between initiator and target.
			 */
			if (data->msgin_len != EXTENDED_SDTR_LEN + 1) {
				/*
				 * received inappropriate message.
				 */
				goto reject;
				break;
			}

			nsp32_analyze_sdtr(SCpnt);

			break;

		case EXTENDED_EXTENDED_IDENTIFY:
			/* SCSI-I only, not supported. */
			goto reject; /* not implemented yet */

			break;

		case EXTENDED_WDTR:
			goto reject; /* not implemented yet */

			break;
			
		default:
			goto reject;
		}
		break;
		
	default:
		goto reject;
	}

 restart:
	if (msgclear == TRUE) {
		data->msgin_len = 0;

		/*
		 * If restarting AutoSCSI, but there are some message to out
		 * (msgout_len > 0), set AutoATN, and set SCSIMSGOUT as 0
		 * (MV_VALID = 0). When commandcontrol is written with
		 * AutoSCSI restart, at the same time MsgOutOccur should be
		 * happened (however, such situation is really possible...?).
		 */
		if (data->msgout_len > 0) {	
			nsp32_write4(base, SCSI_MSG_OUT, 0);
			command |= AUTO_ATN;
		}

		/*
		 * restart AutoSCSI
		 * If it's failed, COMMANDCONTROL_AUTO_COMMAND_PHASE is needed.
		 */
		command |= (AUTO_MSGIN_00_OR_04 | AUTO_MSGIN_02);

		/*
		 * If current msgin03 is TRUE, then flag on.
		 */
		if (data->cur_lunt->msgin03 == TRUE) {
			command |= AUTO_MSGIN_03;
		}
		data->cur_lunt->msgin03 = FALSE;
	} else {
		data->msgin_len++;
	}

	/*
	 * restart AutoSCSI
	 */
	nsp32_restart_autoscsi(SCpnt, command);

	/*
	 * wait SCSI REQ negate for REQ-ACK handshake
	 */
	nsp32_wait_req(data, NEGATE);

	/*
	 * negate SCSI ACK
	 */
	nsp32_sack_negate(data);

	nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit");

	return;

 reject:
	nsp32_msg(KERN_WARNING, 
		  "invalid or unsupported MessageIn, rejected. "
		  "current msg: 0x%x (len: 0x%x), processing msg: 0x%x",
		  msg, data->msgin_len, msgtype);
	nsp32_build_reject(SCpnt);
	data->msgin_len = 0;

	goto restart;
}

/*
 * 
 */
static void nsp32_analyze_sdtr(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data   *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	nsp32_target     *target     = data->cur_target;
	nsp32_sync_table *synct;
	unsigned char     get_period = data->msginbuf[3];
	unsigned char     get_offset = data->msginbuf[4];
	int               entry;
	int               syncnum;

	nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "enter");

	synct   = data->synct;
	syncnum = data->syncnum;

	/*
	 * If this inititor sent the SDTR message, then target responds SDTR,
	 * initiator SYNCREG, ACKWIDTH from SDTR parameter.
	 * Messages are not appropriate, then send back reject message.
	 * If initiator did not send the SDTR, but target sends SDTR, 
	 * initiator calculator the appropriate parameter and send back SDTR.
	 */	
	if (target->sync_flag & SDTR_INITIATOR) {
		/*
		 * Initiator sent SDTR, the target responds and
		 * send back negotiation SDTR.
		 */
		nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "target responds SDTR");
	
		target->sync_flag &= ~SDTR_INITIATOR;
		target->sync_flag |= SDTR_DONE;

		/*
		 * offset:
		 */
		if (get_offset > SYNC_OFFSET) {
			/*
			 * Negotiation is failed, the target send back
			 * unexpected offset value.
			 */
			goto reject;
		}
		
		if (get_offset == ASYNC_OFFSET) {
			/*
			 * Negotiation is succeeded, the target want
			 * to fall back into asynchronous transfer mode.
			 */
			goto async;
		}

		/*
		 * period:
		 *    Check whether sync period is too short. If too short,
		 *    fall back to async mode. If it's ok, then investigate
		 *    the received sync period. If sync period is acceptable
		 *    between sync table start_period and end_period, then
		 *    set this I_T nexus as sent offset and period.
		 *    If it's not acceptable, send back reject and fall back
		 *    to async mode.
		 */
		if (get_period < data->synct[0].period_num) {
			/*
			 * Negotiation is failed, the target send back
			 * unexpected period value.
			 */
			goto reject;
		}

		entry = nsp32_search_period_entry(data, target, get_period);

		if (entry < 0) {
			/*
			 * Target want to use long period which is not 
			 * acceptable NinjaSCSI-32Bi/UDE.
			 */
			goto reject;
		}

		/*
		 * Set new sync table and offset in this I_T nexus.
		 */
		nsp32_set_sync_entry(data, target, entry, get_offset);
	} else {
		/* Target send SDTR to initiator. */
		nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "target send SDTR");
	
		target->sync_flag |= SDTR_INITIATOR;

		/* offset: */
		if (get_offset > SYNC_OFFSET) {
			/* send back as SYNC_OFFSET */
			get_offset = SYNC_OFFSET;
		}

		/* period: */
		if (get_period < data->synct[0].period_num) {
			get_period = data->synct[0].period_num;
		}

		entry = nsp32_search_period_entry(data, target, get_period);

		if (get_offset == ASYNC_OFFSET || entry < 0) {
			nsp32_set_async(data, target);
			nsp32_build_sdtr(SCpnt, 0, ASYNC_OFFSET);
		} else {
			nsp32_set_sync_entry(data, target, entry, get_offset);
			nsp32_build_sdtr(SCpnt, get_period, get_offset);
		}
	}

	target->period = get_period;
	nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit");
	return;

 reject:
	/*
	 * If the current message is unacceptable, send back to the target
	 * with reject message.
	 */
	nsp32_build_reject(SCpnt);

 async:
	nsp32_set_async(data, target);	/* set as ASYNC transfer mode */

	target->period = 0;
	nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit: set async");
	return;
}


/*
 * Search config entry number matched in sync_table from given
 * target and speed period value. If failed to search, return negative value.
 */
static int nsp32_search_period_entry(nsp32_hw_data *data,
				     nsp32_target  *target,
				     unsigned char  period)
{
	int i;

	if (target->limit_entry >= data->syncnum) {
		nsp32_msg(KERN_ERR, "limit_entry exceeds syncnum!");
		target->limit_entry = 0;
	}

	for (i = target->limit_entry; i < data->syncnum; i++) {
		if (period >= data->synct[i].start_period &&
		    period <= data->synct[i].end_period) {
				break;
		}
	}

	/*
	 * Check given period value is over the sync_table value.
	 * If so, return max value.
	 */
	if (i == data->syncnum) {
		i = -1;
	}

	return i;
}


/*
 * target <-> initiator use ASYNC transfer
 */
static void nsp32_set_async(nsp32_hw_data *data, nsp32_target *target)
{
	unsigned char period = data->synct[target->limit_entry].period_num;

	target->offset     = ASYNC_OFFSET;
	target->period     = 0;
	target->syncreg    = TO_SYNCREG(period, ASYNC_OFFSET);
	target->ackwidth   = 0;
	target->sample_reg = 0;

	nsp32_dbg(NSP32_DEBUG_SYNC, "set async");
}


/*
 * target <-> initiator use maximum SYNC transfer
 */
static void nsp32_set_max_sync(nsp32_hw_data *data,
			       nsp32_target  *target,
			       unsigned char *period,
			       unsigned char *offset)
{
	unsigned char period_num, ackwidth;

	period_num = data->synct[target->limit_entry].period_num;
	*period    = data->synct[target->limit_entry].start_period;
	ackwidth   = data->synct[target->limit_entry].ackwidth;
	*offset    = SYNC_OFFSET;

	target->syncreg    = TO_SYNCREG(period_num, *offset);
	target->ackwidth   = ackwidth;
	target->offset     = *offset;
	target->sample_reg = 0;       /* disable SREQ sampling */
}


/*
 * target <-> initiator use entry number speed
 */
static void nsp32_set_sync_entry(nsp32_hw_data *data,
				 nsp32_target  *target,
				 int            entry,
				 unsigned char  offset)
{
	unsigned char period, ackwidth, sample_rate;

	period      = data->synct[entry].period_num;
	ackwidth    = data->synct[entry].ackwidth;
	offset      = offset;
	sample_rate = data->synct[entry].sample_rate;

	target->syncreg    = TO_SYNCREG(period, offset);
	target->ackwidth   = ackwidth;
	target->offset     = offset;
	target->sample_reg = sample_rate | SAMPLING_ENABLE;

	nsp32_dbg(NSP32_DEBUG_SYNC, "set sync");
}


/*
 * It waits until SCSI REQ becomes assertion or negation state.
 *
 * Note: If nsp32_msgin_occur is called, we asserts SCSI ACK. Then
 *     connected target responds SCSI REQ negation.  We have to wait
 *     SCSI REQ becomes negation in order to negate SCSI ACK signal for
 *     REQ-ACK handshake.
 */
static void nsp32_wait_req(nsp32_hw_data *data, int state)
{
	unsigned int  base      = data->BaseAddress;
	int           wait_time = 0;
	unsigned char bus, req_bit;

	if (!((state == ASSERT) || (state == NEGATE))) {
		nsp32_msg(KERN_ERR, "unknown state designation");
	}
	/* REQ is BIT(5) */
	req_bit = (state == ASSERT ? BUSMON_REQ : 0);

	do {
		bus = nsp32_read1(base, SCSI_BUS_MONITOR);
		if ((bus & BUSMON_REQ) == req_bit) {
			nsp32_dbg(NSP32_DEBUG_WAIT, 
				  "wait_time: %d", wait_time);
			return;
		}
		udelay(1);
		wait_time++;
	} while (wait_time < REQSACK_TIMEOUT_TIME);

	nsp32_msg(KERN_WARNING, "wait REQ timeout, req_bit: 0x%x", req_bit);
}

/*
 * It waits until SCSI SACK becomes assertion or negation state.
 */
static void nsp32_wait_sack(nsp32_hw_data *data, int state)
{
	unsigned int  base      = data->BaseAddress;
	int           wait_time = 0;
	unsigned char bus, ack_bit;

	if (!((state == ASSERT) || (state == NEGATE))) {
		nsp32_msg(KERN_ERR, "unknown state designation");
	}
	/* ACK is BIT(4) */
	ack_bit = (state == ASSERT ? BUSMON_ACK : 0);

	do {
		bus = nsp32_read1(base, SCSI_BUS_MONITOR);
		if ((bus & BUSMON_ACK) == ack_bit) {
			nsp32_dbg(NSP32_DEBUG_WAIT,
				  "wait_time: %d", wait_time);
			return;
		}
		udelay(1);
		wait_time++;
	} while (wait_time < REQSACK_TIMEOUT_TIME);

	nsp32_msg(KERN_WARNING, "wait SACK timeout, ack_bit: 0x%x", ack_bit);
}

/*
 * assert SCSI ACK
 *
 * Note: SCSI ACK assertion needs with ACKENB=1, AUTODIRECTION=1.
 */
static void nsp32_sack_assert(nsp32_hw_data *data)
{
	unsigned int  base = data->BaseAddress;
	unsigned char busctrl;

	busctrl  = nsp32_read1(base, SCSI_BUS_CONTROL);
	busctrl	|= (BUSCTL_ACK | AUTODIRECTION | ACKENB);
	nsp32_write1(base, SCSI_BUS_CONTROL, busctrl);
}

/*
 * negate SCSI ACK
 */
static void nsp32_sack_negate(nsp32_hw_data *data)
{
	unsigned int  base = data->BaseAddress;
	unsigned char busctrl;

	busctrl  = nsp32_read1(base, SCSI_BUS_CONTROL);
	busctrl	&= ~BUSCTL_ACK;
	nsp32_write1(base, SCSI_BUS_CONTROL, busctrl);
}



/*
 * Note: n_io_port is defined as 0x7f because I/O register port is
 *	 assigned as:
 *	0x800-0x8ff: memory mapped I/O port
 *	0x900-0xbff: (map same 0x800-0x8ff I/O port image repeatedly)
 *	0xc00-0xfff: CardBus status registers
 */
static int nsp32_detect(struct pci_dev *pdev)
{
	struct Scsi_Host *host;	/* registered host structure */
	struct resource  *res;
	nsp32_hw_data    *data;
	int               ret;
	int               i, j;

	nsp32_dbg(NSP32_DEBUG_REGISTER, "enter");

	/*
	 * register this HBA as SCSI device
	 */
	host = scsi_host_alloc(&nsp32_template, sizeof(nsp32_hw_data));
	if (host == NULL) {
		nsp32_msg (KERN_ERR, "failed to scsi register");
		goto err;
	}

	/*
	 * set nsp32_hw_data
	 */
	data = (nsp32_hw_data *)host->hostdata;

	memcpy(data, &nsp32_data_base, sizeof(nsp32_hw_data));

	host->irq       = data->IrqNumber;
	host->io_port   = data->BaseAddress;
	host->unique_id = data->BaseAddress;
	host->n_io_port	= data->NumAddress;
	host->base      = (unsigned long)data->MmioAddress;

	data->Host      = host;
	spin_lock_init(&(data->Lock));

	data->cur_lunt   = NULL;
	data->cur_target = NULL;

	/*
	 * Bus master transfer mode is supported currently.
	 */
	data->trans_method = NSP32_TRANSFER_BUSMASTER;

	/*
	 * Set clock div, CLOCK_4 (HBA has own external clock, and
	 * dividing * 100ns/4).
	 * Currently CLOCK_4 has only tested, not for CLOCK_2/PCICLK yet.
	 */
	data->clock = CLOCK_4;

	/*
	 * Select appropriate nsp32_sync_table and set I_CLOCKDIV.
	 */
	switch (data->clock) {
	case CLOCK_4:
		/* If data->clock is CLOCK_4, then select 40M sync table. */
		data->synct   = nsp32_sync_table_40M;
		data->syncnum = ARRAY_SIZE(nsp32_sync_table_40M);
		break;
	case CLOCK_2:
		/* If data->clock is CLOCK_2, then select 20M sync table. */
		data->synct   = nsp32_sync_table_20M;
		data->syncnum = ARRAY_SIZE(nsp32_sync_table_20M);
		break;
	case PCICLK:
		/* If data->clock is PCICLK, then select pci sync table. */
		data->synct   = nsp32_sync_table_pci;
		data->syncnum = ARRAY_SIZE(nsp32_sync_table_pci);
		break;
	default:
		nsp32_msg(KERN_WARNING,
			  "Invalid clock div is selected, set CLOCK_4.");
		/* Use default value CLOCK_4 */
		data->clock   = CLOCK_4;
		data->synct   = nsp32_sync_table_40M;
		data->syncnum = ARRAY_SIZE(nsp32_sync_table_40M);
	}

	/*
	 * setup nsp32_lunt
	 */

	/*
	 * setup DMA 
	 */
	if (pci_set_dma_mask(pdev, DMA_32BIT_MASK) != 0) {
		nsp32_msg (KERN_ERR, "failed to set PCI DMA mask");
		goto scsi_unregister;
	}

	/*
	 * allocate autoparam DMA resource.
	 */
	data->autoparam = pci_alloc_consistent(pdev, sizeof(nsp32_autoparam), &(data->auto_paddr));
	if (data->autoparam == NULL) {
		nsp32_msg(KERN_ERR, "failed to allocate DMA memory");
		goto scsi_unregister;
	}

	/*
	 * allocate scatter-gather DMA resource.
	 */
	data->sg_list = pci_alloc_consistent(pdev, NSP32_SG_TABLE_SIZE,
					     &(data->sg_paddr));
	if (data->sg_list == NULL) {
		nsp32_msg(KERN_ERR, "failed to allocate DMA memory");
		goto free_autoparam;
	}

	for (i = 0; i < ARRAY_SIZE(data->lunt); i++) {
		for (j = 0; j < ARRAY_SIZE(data->lunt[0]); j++) {
			int offset = i * ARRAY_SIZE(data->lunt[0]) + j;
			nsp32_lunt tmp = {
				.SCpnt       = NULL,
				.save_datp   = 0,
				.msgin03     = FALSE,
				.sg_num      = 0,
				.cur_entry   = 0,
				.sglun       = &(data->sg_list[offset]),
				.sglun_paddr = data->sg_paddr + (offset * sizeof(nsp32_sglun)),
			};

			data->lunt[i][j] = tmp;
		}
	}

	/*
	 * setup target
	 */
	for (i = 0; i < ARRAY_SIZE(data->target); i++) {
		nsp32_target *target = &(data->target[i]);

		target->limit_entry  = 0;
		target->sync_flag    = 0;
		nsp32_set_async(data, target);
	}

	/*
	 * EEPROM check
	 */
	ret = nsp32_getprom_param(data);
	if (ret == FALSE) {
		data->resettime = 3;	/* default 3 */
	}

	/*
	 * setup HBA
	 */
	nsp32hw_init(data);

	snprintf(data->info_str, sizeof(data->info_str),
		 "NinjaSCSI-32Bi/UDE: irq %d, io 0x%lx+0x%x",
		 host->irq, host->io_port, host->n_io_port);

	/*
	 * SCSI bus reset
	 *
	 * Note: It's important to reset SCSI bus in initialization phase.
	 *     NinjaSCSI-32Bi/UDE HBA EEPROM seems to exchange SDTR when
	 *     system is coming up, so SCSI devices connected to HBA is set as
	 *     un-asynchronous mode.  It brings the merit that this HBA is
	 *     ready to start synchronous transfer without any preparation,
	 *     but we are difficult to control transfer speed.  In addition,
	 *     it prevents device transfer speed from effecting EEPROM start-up
	 *     SDTR.  NinjaSCSI-32Bi/UDE has the feature if EEPROM is set as
	 *     Auto Mode, then FAST-10M is selected when SCSI devices are
	 *     connected same or more than 4 devices.  It should be avoided
	 *     depending on this specification. Thus, resetting the SCSI bus
	 *     restores all connected SCSI devices to asynchronous mode, then
	 *     this driver set SDTR safely later, and we can control all SCSI
	 *     device transfer mode.
	 */
	nsp32_do_bus_reset(data);

	ret = request_irq(host->irq, do_nsp32_isr, IRQF_SHARED, "nsp32", data);
	if (ret < 0) {
		nsp32_msg(KERN_ERR, "Unable to allocate IRQ for NinjaSCSI32 "
			  "SCSI PCI controller. Interrupt: %d", host->irq);
		goto free_sg_list;
	}

        /*
         * PCI IO register
         */
	res = request_region(host->io_port, host->n_io_port, "nsp32");
	if (res == NULL) {
		nsp32_msg(KERN_ERR, 
			  "I/O region 0x%lx+0x%lx is already used",
			  data->BaseAddress, data->NumAddress);
		goto free_irq;
        }

	ret = scsi_add_host(host, &pdev->dev);
	if (ret) {
		nsp32_msg(KERN_ERR, "failed to add scsi host");
		goto free_region;
	}
	scsi_scan_host(host);
	pci_set_drvdata(pdev, host);
	return 0;

 free_region:
	release_region(host->io_port, host->n_io_port);

 free_irq:
	free_irq(host->irq, data);

 free_sg_list:
	pci_free_consistent(pdev, NSP32_SG_TABLE_SIZE,
			    data->sg_list, data->sg_paddr);

 free_autoparam:
	pci_free_consistent(pdev, sizeof(nsp32_autoparam),
			    data->autoparam, data->auto_paddr);
	
 scsi_unregister:
	scsi_host_put(host);

 err:
	return 1;
}

static int nsp32_release(struct Scsi_Host *host)
{
	nsp32_hw_data *data = (nsp32_hw_data *)host->hostdata;

	if (data->autoparam) {
		pci_free_consistent(data->Pci, sizeof(nsp32_autoparam),
				    data->autoparam, data->auto_paddr);
	}

	if (data->sg_list) {
		pci_free_consistent(data->Pci, NSP32_SG_TABLE_SIZE,
				    data->sg_list, data->sg_paddr);
	}

	if (host->irq) {
		free_irq(host->irq, data);
	}

	if (host->io_port && host->n_io_port) {
		release_region(host->io_port, host->n_io_port);
	}

	if (data->MmioAddress) {
		iounmap(data->MmioAddress);
	}

	return 0;
}

static const char *nsp32_info(struct Scsi_Host *shpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)shpnt->hostdata;

	return data->info_str;
}


/****************************************************************************
 * error handler
 */
static int nsp32_eh_abort(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int   base = SCpnt->device->host->io_port;

	nsp32_msg(KERN_WARNING, "abort");

	if (data->cur_lunt->SCpnt == NULL) {
		nsp32_dbg(NSP32_DEBUG_BUSRESET, "abort failed");
		return FAILED;
	}

	if (data->cur_target->sync_flag & (SDTR_INITIATOR | SDTR_TARGET)) {
		/* reset SDTR negotiation */
		data->cur_target->sync_flag = 0;
		nsp32_set_async(data, data->cur_target);
	}

	nsp32_write2(base, TRANSFER_CONTROL, 0);
	nsp32_write2(base, BM_CNT,           0);

	SCpnt->result = DID_ABORT << 16;
	nsp32_scsi_done(SCpnt);

	nsp32_dbg(NSP32_DEBUG_BUSRESET, "abort success");
	return SUCCESS;
}

static int nsp32_eh_bus_reset(struct scsi_cmnd *SCpnt)
{
	nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
	unsigned int   base = SCpnt->device->host->io_port;

	spin_lock_irq(SCpnt->device->host->host_lock);

	nsp32_msg(KERN_INFO, "Bus Reset");	
	nsp32_dbg(NSP32_DEBUG_BUSRESET, "SCpnt=0x%x", SCpnt);

	nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);
	nsp32_do_bus_reset(data);
	nsp32_write2(base, IRQ_CONTROL, 0);

	spin_unlock_irq(SCpnt->device->host->host_lock);
	return SUCCESS;	/* SCSI bus reset is succeeded at any time. */
}

static void nsp32_do_bus_reset(nsp32_hw_data *data)
{
	unsigned int   base = data->BaseAddress;
	unsigned short intrdat;
	int i;

	nsp32_dbg(NSP32_DEBUG_BUSRESET, "in");

	/*
	 * stop all transfer
	 * clear TRANSFERCONTROL_BM_START
	 * clear counter
	 */
	nsp32_write2(base, TRANSFER_CONTROL, 0);
	nsp32_write4(base, BM_CNT,           0);
	nsp32_write4(base, CLR_COUNTER,      CLRCOUNTER_ALLMASK);

	/*
	 * fall back to asynchronous transfer mode
	 * initialize SDTR negotiation flag
	 */
	for (i = 0; i < ARRAY_SIZE(data->target); i++) {
		nsp32_target *target = &data->target[i];

		target->sync_flag = 0;
		nsp32_set_async(data, target);
	}

	/*
	 * reset SCSI bus
	 */
	nsp32_write1(base, SCSI_BUS_CONTROL, BUSCTL_RST);
	udelay(RESET_HOLD_TIME);
	nsp32_write1(base, SCSI_BUS_CONTROL, 0);
	for(i = 0; i < 5; i++) {
		intrdat = nsp32_read2(base, IRQ_STATUS); /* dummy read */
		nsp32_dbg(NSP32_DEBUG_BUSRESET, "irq:1: 0x%x", intrdat);
        }

	data->CurrentSC = NULL;
}

static int nsp32_eh_host_reset(struct scsi_cmnd *SCpnt)
{
	struct Scsi_Host *host = SCpnt->device->host;
	unsigned int      base = SCpnt->device->host->io_port;
	nsp32_hw_data    *data = (nsp32_hw_data *)host->hostdata;

	nsp32_msg(KERN_INFO, "Host Reset");	
	nsp32_dbg(NSP32_DEBUG_BUSRESET, "SCpnt=0x%x", SCpnt);

	spin_lock_irq(SCpnt->device->host->host_lock);

	nsp32hw_init(data);
	nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK);
	nsp32_do_bus_reset(data);
	nsp32_write2(base, IRQ_CONTROL, 0);

	spin_unlock_irq(SCpnt->device->host->host_lock);
	return SUCCESS;	/* Host reset is succeeded at any time. */
}


/**************************************************************************
 * EEPROM handler
 */

/*
 * getting EEPROM parameter
 */
static int nsp32_getprom_param(nsp32_hw_data *data)
{
	int vendor = data->pci_devid->vendor;
	int device = data->pci_devid->device;
	int ret, val, i;

	/*
	 * EEPROM checking.
	 */
	ret = nsp32_prom_read(data, 0x7e);
	if (ret != 0x55) {
		nsp32_msg(KERN_INFO, "No EEPROM detected: 0x%x", ret);
		return FALSE;
	}
	ret = nsp32_prom_read(data, 0x7f);
	if (ret != 0xaa) {
		nsp32_msg(KERN_INFO, "Invalid number: 0x%x", ret);
		return FALSE;
	}

	/*
	 * check EEPROM type
	 */
	if (vendor == PCI_VENDOR_ID_WORKBIT &&
	    device == PCI_DEVICE_ID_WORKBIT_STANDARD) {
		ret = nsp32_getprom_c16(data);
	} else if (vendor == PCI_VENDOR_ID_WORKBIT &&
		   device == PCI_DEVICE_ID_NINJASCSI_32BIB_LOGITEC) {
		ret = nsp32_getprom_at24(data);
	} else if (vendor == PCI_VENDOR_ID_WORKBIT &&
		   device == PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO ) {
		ret = nsp32_getprom_at24(data);
	} else {
		nsp32_msg(KERN_WARNING, "Unknown EEPROM");
		ret = FALSE;
	}

	/* for debug : SPROM data full checking */
	for (i = 0; i <= 0x1f; i++) {
		val = nsp32_prom_read(data, i);
		nsp32_dbg(NSP32_DEBUG_EEPROM,
			  "rom address 0x%x : 0x%x", i, val);
	}

	return ret;
}


/*
 * AT24C01A (Logitec: LHA-600S), AT24C02 (Melco Buffalo: IFC-USLP) data map:
 *
 *   ROMADDR
 *   0x00 - 0x06 :  Device Synchronous Transfer Period (SCSI ID 0 - 6) 
 *			Value 0x0: ASYNC, 0x0c: Ultra-20M, 0x19: Fast-10M
 *   0x07        :  HBA Synchronous Transfer Period
 *			Value 0: AutoSync, 1: Manual Setting
 *   0x08 - 0x0f :  Not Used? (0x0)
 *   0x10        :  Bus Termination
 * 			Value 0: Auto[ON], 1: ON, 2: OFF
 *   0x11        :  Not Used? (0)
 *   0x12        :  Bus Reset Delay Time (0x03)
 *   0x13        :  Bootable CD Support
 *			Value 0: Disable, 1: Enable
 *   0x14        :  Device Scan
 *			Bit   7  6  5  4  3  2  1  0
 *			      |  <----------------->
 * 			      |    SCSI ID: Value 0: Skip, 1: YES
 *			      |->  Value 0: ALL scan,  Value 1: Manual
 *   0x15 - 0x1b :  Not Used? (0)
 *   0x1c        :  Constant? (0x01) (clock div?)
 *   0x1d - 0x7c :  Not Used (0xff)
 *   0x7d	 :  Not Used? (0xff)
 *   0x7e        :  Constant (0x55), Validity signature
 *   0x7f        :  Constant (0xaa), Validity signature
 */
static int nsp32_getprom_at24(nsp32_hw_data *data)
{
	int           ret, i;
	int           auto_sync;
	nsp32_target *target;
	int           entry;

	/*
	 * Reset time which is designated by EEPROM.
	 *
	 * TODO: Not used yet.
	 */
	data->resettime = nsp32_prom_read(data, 0x12);

	/*
	 * HBA Synchronous Transfer Period
	 *
	 * Note: auto_sync = 0: auto, 1: manual.  Ninja SCSI HBA spec says
	 *	that if auto_sync is 0 (auto), and connected SCSI devices are
	 *	same or lower than 3, then transfer speed is set as ULTRA-20M.
	 *	On the contrary if connected SCSI devices are same or higher
	 *	than 4, then transfer speed is set as FAST-10M.
	 *
	 *	I break this rule. The number of connected SCSI devices are
	 *	only ignored. If auto_sync is 0 (auto), then transfer speed is
	 *	forced as ULTRA-20M.
	 */
	ret = nsp32_prom_read(data, 0x07);
	switch (ret) {
	case 0:
		auto_sync = TRUE;
		break;
	case 1:
		auto_sync = FALSE;
		break;
	default:
		nsp32_msg(KERN_WARNING,
			  "Unsupported Auto Sync mode. Fall back to manual mode.");
		auto_sync = TRUE;
	}

	if (trans_mode == ULTRA20M_MODE) {
		auto_sync = TRUE;
	}

	/*
	 * each device Synchronous Transfer Period
	 */
	for (i = 0; i < NSP32_HOST_SCSIID; i++) {
		target = &data->target[i];
		if (auto_sync == TRUE) {
			target->limit_entry = 0;   /* set as ULTRA20M */
		} else {
			ret   = nsp32_prom_read(data, i);
			entry = nsp32_search_period_entry(data, target, ret);
			if (entry < 0) {
				/* search failed... set maximum speed */
				entry = 0;
			}
			target->limit_entry = entry;
		}
	}

	return TRUE;
}


/*
 * C16 110 (I-O Data: SC-NBD) data map:
 *
 *   ROMADDR
 *   0x00 - 0x06 :  Device Synchronous Transfer Period (SCSI ID 0 - 6) 
 *			Value 0x0: 20MB/S, 0x1: 10MB/S, 0x2: 5MB/S, 0x3: ASYNC
 *   0x07        :  0 (HBA Synchronous Transfer Period: Auto Sync)
 *   0x08 - 0x0f :  Not Used? (0x0)
 *   0x10        :  Transfer Mode
 *			Value 0: PIO, 1: Busmater
 *   0x11        :  Bus Reset Delay Time (0x00-0x20)
 *   0x12        :  Bus Termination
 * 			Value 0: Disable, 1: Enable
 *   0x13 - 0x19 :  Disconnection
 *			Value 0: Disable, 1: Enable
 *   0x1a - 0x7c :  Not Used? (0)
 *   0x7d	 :  Not Used? (0xf8)
 *   0x7e        :  Constant (0x55), Validity signature
 *   0x7f        :  Constant (0xaa), Validity signature
 */
static int nsp32_getprom_c16(nsp32_hw_data *data)
{
	int           ret, i;
	nsp32_target *target;
	int           entry, val;

	/*
	 * Reset time which is designated by EEPROM.
	 *
	 * TODO: Not used yet.
	 */
	data->resettime = nsp32_prom_read(data, 0x11);

	/*
	 * each device Synchronous Transfer Period
	 */
	for (i = 0; i < NSP32_HOST_SCSIID; i++) {
		target = &data->target[i];
		ret = nsp32_prom_read(data, i);
		switch (ret) {
		case 0:		/* 20MB/s */
			val = 0x0c;
			break;
		case 1:		/* 10MB/s */
			val = 0x19;
			break;
		case 2:		/* 5MB/s */
			val = 0x32;
			break;
		case 3:		/* ASYNC */
			val = 0x00;
			break;
		default:	/* default 20MB/s */
			val = 0x0c;
			break;
		}
		entry = nsp32_search_period_entry(data, target, val);
		if (entry < 0 || trans_mode == ULTRA20M_MODE) {
			/* search failed... set maximum speed */
			entry = 0;
		}
		target->limit_entry = entry;
	}

	return TRUE;
}


/*
 * Atmel AT24C01A (drived in 5V) serial EEPROM routines
 */
static int nsp32_prom_read(nsp32_hw_data *data, int romaddr)
{
	int i, val;

	/* start condition */
	nsp32_prom_start(data);

	/* device address */
	nsp32_prom_write_bit(data, 1);	/* 1 */
	nsp32_prom_write_bit(data, 0);	/* 0 */
	nsp32_prom_write_bit(data, 1);	/* 1 */
	nsp32_prom_write_bit(data, 0);	/* 0 */
	nsp32_prom_write_bit(data, 0);	/* A2: 0 (GND) */
	nsp32_prom_write_bit(data, 0);	/* A1: 0 (GND) */
	nsp32_prom_write_bit(data, 0);	/* A0: 0 (GND) */

	/* R/W: W for dummy write */
	nsp32_prom_write_bit(data, 0);

	/* ack */
	nsp32_prom_write_bit(data, 0);

	/* word address */
	for (i = 7; i >= 0; i--) {
		nsp32_prom_write_bit(data, ((romaddr >> i) & 1));
	}

	/* ack */
	nsp32_prom_write_bit(data, 0);

	/* start condition */
	nsp32_prom_start(data);

	/* device address */
	nsp32_prom_write_bit(data, 1);	/* 1 */
	nsp32_prom_write_bit(data, 0);	/* 0 */
	nsp32_prom_write_bit(data, 1);	/* 1 */
	nsp32_prom_write_bit(data, 0);	/* 0 */
	nsp32_prom_write_bit(data, 0);	/* A2: 0 (GND) */
	nsp32_prom_write_bit(data, 0);	/* A1: 0 (GND) */
	nsp32_prom_write_bit(data, 0);	/* A0: 0 (GND) */

	/* R/W: R */
	nsp32_prom_write_bit(data, 1);

	/* ack */
	nsp32_prom_write_bit(data, 0);

	/* data... */
	val = 0;
	for (i = 7; i >= 0; i--) {
		val += (nsp32_prom_read_bit(data) << i);
	}
	
	/* no ack */
	nsp32_prom_write_bit(data, 1);

	/* stop condition */
	nsp32_prom_stop(data);

	return val;
}

static void nsp32_prom_set(nsp32_hw_data *data, int bit, int val)
{
	int base = data->BaseAddress;
	int tmp;

	tmp = nsp32_index_read1(base, SERIAL_ROM_CTL);

	if (val == 0) {
		tmp &= ~bit;
	} else {
		tmp |=  bit;
	}

	nsp32_index_write1(base, SERIAL_ROM_CTL, tmp);

	udelay(10);
}

static int nsp32_prom_get(nsp32_hw_data *data, int bit)
{
	int base = data->BaseAddress;
	int tmp, ret;

	if (bit != SDA) {
		nsp32_msg(KERN_ERR, "return value is not appropriate");
		return 0;
	}


	tmp = nsp32_index_read1(base, SERIAL_ROM_CTL) & bit;

	if (tmp == 0) {
		ret = 0;
	} else {
		ret = 1;
	}

	udelay(10);

	return ret;
}

static void nsp32_prom_start (nsp32_hw_data *data)
{
	/* start condition */
	nsp32_prom_set(data, SCL, 1);
	nsp32_prom_set(data, SDA, 1);
	nsp32_prom_set(data, ENA, 1);	/* output mode */
	nsp32_prom_set(data, SDA, 0);	/* keeping SCL=1 and transiting
					 * SDA 1->0 is start condition */
	nsp32_prom_set(data, SCL, 0);
}

static void nsp32_prom_stop (nsp32_hw_data *data)
{
	/* stop condition */
	nsp32_prom_set(data, SCL, 1);
	nsp32_prom_set(data, SDA, 0);
	nsp32_prom_set(data, ENA, 1);	/* output mode */
	nsp32_prom_set(data, SDA, 1);
	nsp32_prom_set(data, SCL, 0);
}

static void nsp32_prom_write_bit(nsp32_hw_data *data, int val)
{
	/* write */
	nsp32_prom_set(data, SDA, val);
	nsp32_prom_set(data, SCL, 1  );
	nsp32_prom_set(data, SCL, 0  );
}

static int nsp32_prom_read_bit(nsp32_hw_data *data)
{
	int val;

	/* read */
	nsp32_prom_set(data, ENA, 0);	/* input mode */
	nsp32_prom_set(data, SCL, 1);

	val = nsp32_prom_get(data, SDA);

	nsp32_prom_set(data, SCL, 0);
	nsp32_prom_set(data, ENA, 1);	/* output mode */

	return val;
}


/**************************************************************************
 * Power Management
 */
#ifdef CONFIG_PM

/* Device suspended */
static int nsp32_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct Scsi_Host *host = pci_get_drvdata(pdev);

	nsp32_msg(KERN_INFO, "pci-suspend: pdev=0x%p, state=%ld, slot=%s, host=0x%p", pdev, state, pci_name(pdev), host);

	pci_save_state     (pdev);
	pci_disable_device (pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));

	return 0;
}

/* Device woken up */
static int nsp32_resume(struct pci_dev *pdev)
{
	struct Scsi_Host *host = pci_get_drvdata(pdev);
	nsp32_hw_data    *data = (nsp32_hw_data *)host->hostdata;
	unsigned short    reg;

	nsp32_msg(KERN_INFO, "pci-resume: pdev=0x%p, slot=%s, host=0x%p", pdev, pci_name(pdev), host);

	pci_set_power_state(pdev, PCI_D0);
	pci_enable_wake    (pdev, PCI_D0, 0);
	pci_restore_state  (pdev);

	reg = nsp32_read2(data->BaseAddress, INDEX_REG);

	nsp32_msg(KERN_INFO, "io=0x%x reg=0x%x", data->BaseAddress, reg);

	if (reg == 0xffff) {
		nsp32_msg(KERN_INFO, "missing device. abort resume.");
		return 0;
	}

	nsp32hw_init      (data);
	nsp32_do_bus_reset(data);

	nsp32_msg(KERN_INFO, "resume success");

	return 0;
}

#endif

/************************************************************************
 * PCI/Cardbus probe/remove routine
 */
static int __devinit nsp32_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	int ret;
	nsp32_hw_data *data = &nsp32_data_base;

	nsp32_dbg(NSP32_DEBUG_REGISTER, "enter");

        ret = pci_enable_device(pdev);
	if (ret) {
		nsp32_msg(KERN_ERR, "failed to enable pci device");
		return ret;
	}

	data->Pci         = pdev;
	data->pci_devid   = id;
	data->IrqNumber   = pdev->irq;
	data->BaseAddress = pci_resource_start(pdev, 0);
	data->NumAddress  = pci_resource_len  (pdev, 0);
	data->MmioAddress = ioremap_nocache(pci_resource_start(pdev, 1),
					       pci_resource_len  (pdev, 1));
	data->MmioLength  = pci_resource_len  (pdev, 1);

	pci_set_master(pdev);

	ret = nsp32_detect(pdev);

	nsp32_msg(KERN_INFO, "irq: %i mmio: %p+0x%lx slot: %s model: %s",
		  pdev->irq,
		  data->MmioAddress, data->MmioLength,
		  pci_name(pdev),
		  nsp32_model[id->driver_data]);

	nsp32_dbg(NSP32_DEBUG_REGISTER, "exit %d", ret);

	return ret;
}

static void __devexit nsp32_remove(struct pci_dev *pdev)
{
	struct Scsi_Host *host = pci_get_drvdata(pdev);

	nsp32_dbg(NSP32_DEBUG_REGISTER, "enter");

        scsi_remove_host(host);

	nsp32_release(host);

	scsi_host_put(host);
}

static struct pci_driver nsp32_driver = {
	.name		= "nsp32",
	.id_table	= nsp32_pci_table,
	.probe		= nsp32_probe,
	.remove		= __devexit_p(nsp32_remove),
#ifdef CONFIG_PM
	.suspend	= nsp32_suspend, 
	.resume		= nsp32_resume, 
#endif
};

/*********************************************************************
 * Moule entry point
 */
static int __init init_nsp32(void) {
	nsp32_msg(KERN_INFO, "loading...");
	return pci_register_driver(&nsp32_driver);
}

static void __exit exit_nsp32(void) {
	nsp32_msg(KERN_INFO, "unloading...");
	pci_unregister_driver(&nsp32_driver);
}

module_init(init_nsp32);
module_exit(exit_nsp32);

/* end */