summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/t128.c
blob: 2fdf0c3cd781c84fff2f92542708ba84f7eeed17 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
#define AUTOSENSE
#define PSEUDO_DMA

/*
 * Trantor T128/T128F/T228 driver
 *	Note : architecturally, the T100 and T130 are different and won't 
 * 	work
 *
 * Copyright 1993, Drew Eckhardt
 *	Visionary Computing
 *	(Unix and Linux consulting and custom programming)
 *	drew@colorado.edu
 *      +1 (303) 440-4894
 *
 * DISTRIBUTION RELEASE 3.
 *
 * For more information, please consult 
 *
 * Trantor Systems, Ltd.
 * T128/T128F/T228 SCSI Host Adapter
 * Hardware Specifications
 * 
 * Trantor Systems, Ltd. 
 * 5415 Randall Place
 * Fremont, CA 94538
 * 1+ (415) 770-1400, FAX 1+ (415) 770-9910
 * 
 * and 
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
 *
 * NCR Microelectronics
 * 1635 Aeroplaza Drive
 * Colorado Springs, CO 80916
 * 1+ (719) 578-3400
 * 1+ (800) 334-5454
 */

/*
 * Options : 
 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
 *      for commands that return with a CHECK CONDITION status. 
 *
 * PSEUDO_DMA - enables PSEUDO-DMA hardware, should give a 3-4X performance
 * increase compared to polled I/O.
 *
 * PARITY - enable parity checking.  Not supported.
 * 
 * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
 *
 *
 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers.  You
 *          only really want to use this if you're having a problem with
 *          dropped characters during high speed communications, and even
 *          then, you're going to be better off twiddling with transfersize.
 *
 * USLEEP - enable support for devices that don't disconnect.  Untested.
 *
 * The card is detected and initialized in one of several ways : 
 * 1.  Autoprobe (default) - since the board is memory mapped, 
 *     a BIOS signature is scanned for to locate the registers.
 *     An interrupt is triggered to autoprobe for the interrupt
 *     line.
 *
 * 2.  With command line overrides - t128=address,irq may be 
 *     used on the LILO command line to override the defaults.
 *
 * 3.  With the T128_OVERRIDE compile time define.  This is 
 *     specified as an array of address, irq tuples.  Ie, for
 *     one board at the default 0xcc000 address, IRQ5, I could say 
 *     -DT128_OVERRIDE={{0xcc000, 5}}
 *	
 *     Note that if the override methods are used, place holders must
 *     be specified for other boards in the system.
 * 
 * T128/T128F jumper/dipswitch settings (note : on my sample, the switches 
 * were epoxy'd shut, meaning I couldn't change the 0xcc000 base address) :
 *
 * T128    Sw7 Sw8 Sw6 = 0ws Sw5 = boot 
 * T128F   Sw6 Sw7 Sw5 = 0ws Sw4 = boot Sw8 = floppy disable
 * cc000   off off      
 * c8000   off on
 * dc000   on  off
 * d8000   on  on
 *
 * 
 * Interrupts 
 * There is a 12 pin jumper block, jp1, numbered as follows : 
 *   T128 (JP1)  	 T128F (J5)
 * 2 4 6 8 10 12	11 9  7 5 3 1
 * 1 3 5 7 9  11	12 10 8 6 4 2
 *
 * 3   2-4
 * 5   1-3
 * 7   3-5
 * T128F only 
 * 10 8-10
 * 12 7-9
 * 14 10-12
 * 15 9-11
 */
 
/*
 * $Log: t128.c,v $
 */

#include <asm/system.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <linux/blk.h>
#include "scsi.h"
#include "hosts.h"
#include "t128.h"
#define AUTOPROBE_IRQ
#include "NCR5380.h"
#include "constants.h"
#include "sd.h"
#include <linux/stat.h>
#include <linux/init.h>

struct proc_dir_entry proc_scsi_t128 = {
    PROC_SCSI_T128, 4, "t128",
    S_IFDIR | S_IRUGO | S_IXUGO, 2
};


static struct override {
    unsigned char *address;
    int irq;
} overrides 
#ifdef T128_OVERRIDE
    [] __initdata = T128_OVERRIDE;
#else
    [4] __initdata = {{NULL,IRQ_AUTO}, {NULL,IRQ_AUTO}, 
        {NULL,IRQ_AUTO}, {NULL,IRQ_AUTO}};
#endif

#define NO_OVERRIDES (sizeof(overrides) / sizeof(struct override))

static struct base {
    unsigned int address;
    int noauto;
} bases[] __initdata = {
    { 0xcc000, 0}, { 0xc8000, 0}, { 0xdc000, 0}, { 0xd8000, 0}
};

#define NO_BASES (sizeof (bases) / sizeof (struct base))

static const struct signature {
    const char *string;
    int offset;
} signatures[] __initdata = {
{"TSROM: SCSI BIOS, Version 1.12", 0x36},
};

#define NO_SIGNATURES (sizeof (signatures) /  sizeof (struct signature))

/*
 * Function : t128_setup(char *str, int *ints)
 *
 * Purpose : LILO command line initialization of the overrides array,
 * 
 * Inputs : str - unused, ints - array of integer parameters with ints[0]
 *	equal to the number of ints.
 *
 */

void __init t128_setup(char *str, int *ints){
    static int commandline_current = 0;
    int i;
    if (ints[0] != 2) 
	printk("t128_setup : usage t128=address,irq\n");
    else 
	if (commandline_current < NO_OVERRIDES) {
	    overrides[commandline_current].address = (unsigned char *) ints[1];
	    overrides[commandline_current].irq = ints[2];
	    for (i = 0; i < NO_BASES; ++i)
		if (bases[i].address == ints[1]) {
		    bases[i].noauto = 1;
		    break;
		}
	    ++commandline_current;
	}
}

/* 
 * Function : int t128_detect(Scsi_Host_Template * tpnt)
 *
 * Purpose : detects and initializes T128,T128F, or T228 controllers
 *	that were autoprobed, overridden on the LILO command line, 
 *	or specified at compile time.
 *
 * Inputs : tpnt - template for this SCSI adapter.
 * 
 * Returns : 1 if a host adapter was found, 0 if not.
 *
 */

int __init t128_detect(Scsi_Host_Template * tpnt){
    static int current_override = 0, current_base = 0;
    struct Scsi_Host *instance;
    unsigned char *base;
    int sig, count;

    tpnt->proc_dir = &proc_scsi_t128;
    tpnt->proc_info = &t128_proc_info;

    for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
	base = NULL;

	if (overrides[current_override].address)
	    base = overrides[current_override].address;
	else 
	    for (; !base && (current_base < NO_BASES); ++current_base) {
#if (TDEBUG & TDEBUG_INIT)
    printk("scsi-t128 : probing address %08x\n", bases[current_base].address);
#endif
		for (sig = 0; sig < NO_SIGNATURES; ++sig) 
		    if (!bases[current_base].noauto && 
			check_signature(bases[current_base].address +
					signatures[sig].offset,
					signatures[sig].string,
					strlen(signatures[sig].string))) {
			base = (unsigned char *) bases[current_base].address;
#if (TDEBUG & TDEBUG_INIT)
			printk("scsi-t128 : detected board.\n");
#endif
			break;
		    }
	    }

#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
	printk("scsi-t128 : base = %08x\n", (unsigned int) base);
#endif

	if (!base)
	    break;

	instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
	instance->base = phys_to_virt((unsigned int)base);

	NCR5380_init(instance, 0);

	if (overrides[current_override].irq != IRQ_AUTO)
	    instance->irq = overrides[current_override].irq;
	else 
	    instance->irq = NCR5380_probe_irq(instance, T128_IRQS);

	if (instance->irq != IRQ_NONE) 
	    if (request_irq(instance->irq, do_t128_intr, SA_INTERRUPT, "t128", NULL)) {
		printk("scsi%d : IRQ%d not free, interrupts disabled\n", 
		    instance->host_no, instance->irq);
		instance->irq = IRQ_NONE;
	    } 

	if (instance->irq == IRQ_NONE) {
	    printk("scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
	    printk("scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
	}

#if defined(TDEBUG) && (TDEBUG & TDEBUG_INIT)
	printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
#endif

	printk("scsi%d : at 0x%08x", instance->host_no, (int) 
	    instance->base);
	if (instance->irq == IRQ_NONE)
	    printk (" interrupts disabled");
	else 
	    printk (" irq %d", instance->irq);
	printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d",
	    CAN_QUEUE, CMD_PER_LUN, T128_PUBLIC_RELEASE);
	NCR5380_print_options(instance);
	printk("\n");

	++current_override;
	++count;
    }
    return count;
}

/*
 * Function : int t128_biosparam(Disk * disk, kdev_t dev, int *ip)
 *
 * Purpose : Generates a BIOS / DOS compatible H-C-S mapping for 
 *	the specified device / size.
 * 
 * Inputs : size = size of device in sectors (512 bytes), dev = block device
 *	major / minor, ip[] = {heads, sectors, cylinders}  
 *
 * Returns : always 0 (success), initializes ip
 *	
 */

/* 
 * XXX Most SCSI boards use this mapping, I could be incorrect.  Some one
 * using hard disks on a trantor should verify that this mapping corresponds
 * to that used by the BIOS / ASPI driver by running the linux fdisk program
 * and matching the H_C_S coordinates to what DOS uses.
 */

int t128_biosparam(Disk * disk, kdev_t dev, int * ip)
{
  int size = disk->capacity;
  ip[0] = 64;
  ip[1] = 32;
  ip[2] = size >> 11;
  return 0;
}

/*
 * Function : int NCR5380_pread (struct Scsi_Host *instance, 
 *	unsigned char *dst, int len)
 *
 * Purpose : Fast 5380 pseudo-dma read function, transfers len bytes to 
 *	dst
 * 
 * Inputs : dst = destination, len = length in bytes
 *
 * Returns : 0 on success, non zero on a failure such as a watchdog 
 * 	timeout.
 */

static inline int NCR5380_pread (struct Scsi_Host *instance, unsigned char *dst,
    int len) {
    register unsigned char *reg = (unsigned char *) (instance->base + 
	T_DATA_REG_OFFSET), *d = dst;
    register int i = len;


#if 0
    for (; i; --i) {
	while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
#else
    while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
    for (; i; --i) {
#endif
	*d++ = *reg;
    }

    if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
	unsigned char tmp;
	volatile unsigned char *foo;
	foo = instance->base + T_CONTROL_REG_OFFSET;
	tmp = *foo;
	*foo = tmp | T_CR_CT;
	*foo = tmp;
	printk("scsi%d : watchdog timer fired in NCR5380_pread()\n",
	    instance->host_no);
	return -1;
    } else
	return 0;
}

/*
 * Function : int NCR5380_pwrite (struct Scsi_Host *instance, 
 *	unsigned char *src, int len)
 *
 * Purpose : Fast 5380 pseudo-dma write function, transfers len bytes from
 *	src
 * 
 * Inputs : src = source, len = length in bytes
 *
 * Returns : 0 on success, non zero on a failure such as a watchdog 
 * 	timeout.
 */

static inline int NCR5380_pwrite (struct Scsi_Host *instance, unsigned char *src,
    int len) {
    register unsigned char *reg = (unsigned char *) (instance->base + 
	T_DATA_REG_OFFSET), *s = src;
    register int i = len;

#if 0
    for (; i; --i) {
	while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
#else
    while (!(instance->base[T_STATUS_REG_OFFSET]) & T_ST_RDY) barrier();
    for (; i; --i) {
#endif
	*reg = *s++;
    }

    if (*(instance->base + T_STATUS_REG_OFFSET) & T_ST_TIM) {
	unsigned char tmp;
	volatile unsigned char *foo;
	foo = instance->base + T_CONTROL_REG_OFFSET;
	tmp = *foo;
	*foo = tmp | T_CR_CT;
	*foo = tmp;
	printk("scsi%d : watchdog timer fired in NCR5380_pwrite()\n",
	    instance->host_no);
	return -1;
    } else 
	return 0;
}

#include "NCR5380.c"

#ifdef MODULE
/* Eventually this will go into an include file, but this will be later */
Scsi_Host_Template driver_template = TRANTOR_T128;

#include "scsi_module.c"
#endif