aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/dtc.c
blob: c2677ba29c74619ad581b895018ffd07ee3ce9b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486

#define AUTOSENSE
#define PSEUDO_DMA
#define DONT_USE_INTR
#define UNSAFE			/* Leave interrupts enabled during pseudo-dma I/O */
#define xNDEBUG (NDEBUG_INTR+NDEBUG_RESELECTION+\
		 NDEBUG_SELECTION+NDEBUG_ARBITRATION)
#define DMA_WORKS_RIGHT


/*
 * DTC 3180/3280 driver, by
 *	Ray Van Tassle	rayvt@comm.mot.com
 *
 *	taken from ...
 *	Trantor T128/T128F/T228 driver by...
 *
 * 	Drew Eckhardt
 *	Visionary Computing
 *	(Unix and Linux consulting and custom programming)
 *	drew@colorado.edu
 *      +1 (303) 440-4894
 *
 * DISTRIBUTION RELEASE 1.
 *
 * For more information, please consult 
 *
 * NCR 5380 Family
 * SCSI Protocol Controller
 * Databook
*/

/*
 * 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.
 *
 * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. 
 *		You probably want this.
 *
 * 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 - dtc=address,irq may be 
 *     used on the LILO command line to override the defaults.
 * 
*/

/*----------------------------------------------------------------*/
/* the following will set the monitor border color (useful to find
 where something crashed or gets stuck at */
/* 1 = blue
 2 = green
 3 = cyan
 4 = red
 5 = magenta
 6 = yellow
 7 = white
*/
#if 0
#define rtrc(i) {inb(0x3da); outb(0x31, 0x3c0); outb((i), 0x3c0);}
#else
#define rtrc(i) {}
#endif


#include <asm/system.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include "dtc.h"
#define AUTOPROBE_IRQ
#include "NCR5380.h"


#define DTC_PUBLIC_RELEASE 2

/*
 * The DTC3180 & 3280 boards are memory mapped.
 * 
 */

/*
 */
/* Offset from DTC_5380_OFFSET */
#define DTC_CONTROL_REG		0x100	/* rw */
#define D_CR_ACCESS		0x80	/* ro set=can access 3280 registers */
#define CSR_DIR_READ		0x40	/* rw direction, 1 = read 0 = write */

#define CSR_RESET              0x80	/* wo  Resets 53c400 */
#define CSR_5380_REG           0x80	/* ro  5380 registers can be accessed */
#define CSR_TRANS_DIR          0x40	/* rw  Data transfer direction */
#define CSR_SCSI_BUFF_INTR     0x20	/* rw  Enable int on transfer ready */
#define CSR_5380_INTR          0x10	/* rw  Enable 5380 interrupts */
#define CSR_SHARED_INTR        0x08	/* rw  Interrupt sharing */
#define CSR_HOST_BUF_NOT_RDY   0x04	/* ro  Host buffer not ready */
#define CSR_SCSI_BUF_RDY       0x02	/* ro  SCSI buffer ready */
#define CSR_GATED_5380_IRQ     0x01	/* ro  Last block xferred */
#define CSR_INT_BASE (CSR_SCSI_BUFF_INTR | CSR_5380_INTR)


#define DTC_BLK_CNT		0x101	/* rw 
					 * # of 128-byte blocks to transfer */


#define D_CR_ACCESS             0x80	/* ro set=can access 3280 registers */

#define DTC_SWITCH_REG		0x3982	/* ro - DIP switches */
#define DTC_RESUME_XFER		0x3982	/* wo - resume data xfer 
					 * after disconnect/reconnect*/

#define DTC_5380_OFFSET		0x3880	/* 8 registers here, see NCR5380.h */

/*!!!! for dtc, it's a 128 byte buffer at 3900 !!! */
#define DTC_DATA_BUF		0x3900	/* rw 128 bytes long */

static struct override {
	unsigned int address;
	int irq;
} overrides
#ifdef OVERRIDE
[] __initdata = OVERRIDE;
#else
[4] __initdata = {
	{ 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }, { 0, IRQ_AUTO }
};
#endif

#define NO_OVERRIDES ARRAY_SIZE(overrides)

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

#define NO_BASES ARRAY_SIZE(bases)

static const struct signature {
	const char *string;
	int offset;
} signatures[] = {
	{"DATA TECHNOLOGY CORPORATION BIOS", 0x25},
};

#define NO_SIGNATURES ARRAY_SIZE(signatures)

#ifndef MODULE
/*
 * Function : dtc_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.
 *
 */

static void __init dtc_setup(char *str, int *ints)
{
	static int commandline_current = 0;
	int i;
	if (ints[0] != 2)
		printk("dtc_setup: usage dtc=address,irq\n");
	else if (commandline_current < NO_OVERRIDES) {
		overrides[commandline_current].address = 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;
	}
}
#endif

/* 
 * Function : int dtc_detect(struct scsi_host_template * tpnt)
 *
 * Purpose : detects and initializes DTC 3180/3280 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.
 *
*/

static int __init dtc_detect(struct scsi_host_template * tpnt)
{
	static int current_override = 0, current_base = 0;
	struct Scsi_Host *instance;
	unsigned int addr;
	void __iomem *base;
	int sig, count;

	tpnt->proc_name = "dtc3x80";
	tpnt->proc_info = &dtc_proc_info;

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

		if (overrides[current_override].address) {
			addr = overrides[current_override].address;
			base = ioremap(addr, 0x2000);
			if (!base)
				addr = 0;
		} else
			for (; !addr && (current_base < NO_BASES); ++current_base) {
#if (DTCDEBUG & DTCDEBUG_INIT)
				printk(KERN_DEBUG "scsi-dtc : probing address %08x\n", bases[current_base].address);
#endif
				if (bases[current_base].noauto)
					continue;
				base = ioremap(bases[current_base].address, 0x2000);
				if (!base)
					continue;
				for (sig = 0; sig < NO_SIGNATURES; ++sig) {
					if (check_signature(base + signatures[sig].offset, signatures[sig].string, strlen(signatures[sig].string))) {
						addr = bases[current_base].address;
#if (DTCDEBUG & DTCDEBUG_INIT)
						printk(KERN_DEBUG "scsi-dtc : detected board.\n");
#endif
						goto found;
					}
				}
				iounmap(base);
			}

#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
		printk(KERN_DEBUG "scsi-dtc : base = %08x\n", addr);
#endif

		if (!addr)
			break;

found:
		instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
		if (instance == NULL)
			break;

		instance->base = addr;
		((struct NCR5380_hostdata *)(instance)->hostdata)->base = base;

		NCR5380_init(instance, 0);

		NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);	/* Enable int's */
		if (overrides[current_override].irq != IRQ_AUTO)
			instance->irq = overrides[current_override].irq;
		else
			instance->irq = NCR5380_probe_irq(instance, DTC_IRQS);

#ifndef DONT_USE_INTR
		/* With interrupts enabled, it will sometimes hang when doing heavy
		 * reads. So better not enable them until I finger it out. */
		if (instance->irq != SCSI_IRQ_NONE)
			if (request_irq(instance->irq, dtc_intr, IRQF_DISABLED,
					"dtc", instance)) {
				printk(KERN_ERR "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
				instance->irq = SCSI_IRQ_NONE;
			}

		if (instance->irq == SCSI_IRQ_NONE) {
			printk(KERN_WARNING "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
			printk(KERN_WARNING "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
		}
#else
		if (instance->irq != SCSI_IRQ_NONE)
			printk(KERN_WARNING "scsi%d : interrupts not used. Might as well not jumper it.\n", instance->host_no);
		instance->irq = SCSI_IRQ_NONE;
#endif
#if defined(DTCDEBUG) && (DTCDEBUG & DTCDEBUG_INIT)
		printk("scsi%d : irq = %d\n", instance->host_no, instance->irq);
#endif

		printk(KERN_INFO "scsi%d : at 0x%05X", instance->host_no, (int) instance->base);
		if (instance->irq == SCSI_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, DTC_PUBLIC_RELEASE);
		NCR5380_print_options(instance);
		printk("\n");

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

/*
 * Function : int dtc_biosparam(Disk * disk, struct block_device *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.
*/

static int dtc_biosparam(struct scsi_device *sdev, struct block_device *dev,
			 sector_t capacity, int *ip)
{
	int size = 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, reads 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 int dtc_maxi = 0;
static int dtc_wmaxi = 0;

static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
{
	unsigned char *d = dst;
	int i;			/* For counting time spent in the poll-loop */
	NCR5380_local_declare();
	NCR5380_setup(instance);

	i = 0;
	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
	if (instance->irq == SCSI_IRQ_NONE)
		NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ);
	else
		NCR5380_write(DTC_CONTROL_REG, CSR_DIR_READ | CSR_INT_BASE);
	NCR5380_write(DTC_BLK_CNT, len >> 7);	/* Block count */
	rtrc(1);
	while (len > 0) {
		rtrc(2);
		while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
			++i;
		rtrc(3);
		memcpy_fromio(d, base + DTC_DATA_BUF, 128);
		d += 128;
		len -= 128;
		rtrc(7);
		/*** with int's on, it sometimes hangs after here.
		 * Looks like something makes HBNR go away. */
	}
	rtrc(4);
	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
		++i;
	NCR5380_write(MODE_REG, 0);	/* Clear the operating mode */
	rtrc(0);
	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	if (i > dtc_maxi)
		dtc_maxi = i;
	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)
{
	int i;
	NCR5380_local_declare();
	NCR5380_setup(instance);

	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
	NCR5380_write(MODE_REG, MR_ENABLE_EOP_INTR | MR_DMA_MODE);
	/* set direction (write) */
	if (instance->irq == SCSI_IRQ_NONE)
		NCR5380_write(DTC_CONTROL_REG, 0);
	else
		NCR5380_write(DTC_CONTROL_REG, CSR_5380_INTR);
	NCR5380_write(DTC_BLK_CNT, len >> 7);	/* Block count */
	for (i = 0; len > 0; ++i) {
		rtrc(5);
		/* Poll until the host buffer can accept data. */
		while (NCR5380_read(DTC_CONTROL_REG) & CSR_HOST_BUF_NOT_RDY)
			++i;
		rtrc(3);
		memcpy_toio(base + DTC_DATA_BUF, src, 128);
		src += 128;
		len -= 128;
	}
	rtrc(4);
	while (!(NCR5380_read(DTC_CONTROL_REG) & D_CR_ACCESS))
		++i;
	rtrc(6);
	/* Wait until the last byte has been sent to the disk */
	while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
		++i;
	rtrc(7);
	/* Check for parity error here. fixme. */
	NCR5380_write(MODE_REG, 0);	/* Clear the operating mode */
	rtrc(0);
	if (i > dtc_wmaxi)
		dtc_wmaxi = i;
	return (0);
}

MODULE_LICENSE("GPL");

#include "NCR5380.c"

static int dtc_release(struct Scsi_Host *shost)
{
	NCR5380_local_declare();
	NCR5380_setup(shost);
	if (shost->irq)
		free_irq(shost->irq, shost);
	NCR5380_exit(shost);
	if (shost->io_port && shost->n_io_port)
		release_region(shost->io_port, shost->n_io_port);
	scsi_unregister(shost);
	iounmap(base);
	return 0;
}

static struct scsi_host_template driver_template = {
	.name				= "DTC 3180/3280 ",
	.detect				= dtc_detect,
	.release			= dtc_release,
	.queuecommand			= dtc_queue_command,
	.eh_abort_handler		= dtc_abort,
	.eh_bus_reset_handler		= dtc_bus_reset,
	.bios_param     		= dtc_biosparam,
	.can_queue      		= CAN_QUEUE,
	.this_id        		= 7,
	.sg_tablesize   		= SG_ALL,
	.cmd_per_lun    		= CMD_PER_LUN,
	.use_clustering 		= DISABLE_CLUSTERING,
};
#include "scsi_module.c"