xref: /openbmc/linux/drivers/scsi/g_NCR5380.c (revision 4800cd83)
1 /*
2  * Generic Generic NCR5380 driver
3  *
4  * Copyright 1993, Drew Eckhardt
5  *	Visionary Computing
6  *	(Unix and Linux consulting and custom programming)
7  *	drew@colorado.edu
8  *      +1 (303) 440-4894
9  *
10  * NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
11  *    K.Lentin@cs.monash.edu.au
12  *
13  * NCR53C400A extensions (c) 1996, Ingmar Baumgart
14  *    ingmar@gonzo.schwaben.de
15  *
16  * DTC3181E extensions (c) 1997, Ronald van Cuijlenborg
17  * ronald.van.cuijlenborg@tip.nl or nutty@dds.nl
18  *
19  * Added ISAPNP support for DTC436 adapters,
20  * Thomas Sailer, sailer@ife.ee.ethz.ch
21  *
22  * ALPHA RELEASE 1.
23  *
24  * For more information, please consult
25  *
26  * NCR 5380 Family
27  * SCSI Protocol Controller
28  * Databook
29  *
30  * NCR Microelectronics
31  * 1635 Aeroplaza Drive
32  * Colorado Springs, CO 80916
33  * 1+ (719) 578-3400
34  * 1+ (800) 334-5454
35  */
36 
37 /*
38  * TODO : flesh out DMA support, find some one actually using this (I have
39  * 	a memory mapped Trantor board that works fine)
40  */
41 
42 /*
43  * Options :
44  *
45  * PARITY - enable parity checking.  Not supported.
46  *
47  * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
48  *
49  * USLEEP - enable support for devices that don't disconnect.  Untested.
50  *
51  * The card is detected and initialized in one of several ways :
52  * 1.  With command line overrides - NCR5380=port,irq may be
53  *     used on the LILO command line to override the defaults.
54  *
55  * 2.  With the GENERIC_NCR5380_OVERRIDE compile time define.  This is
56  *     specified as an array of address, irq, dma, board tuples.  Ie, for
57  *     one board at 0x350, IRQ5, no dma, I could say
58  *     -DGENERIC_NCR5380_OVERRIDE={{0xcc000, 5, DMA_NONE, BOARD_NCR5380}}
59  *
60  * -1 should be specified for no or DMA interrupt, -2 to autoprobe for an
61  * 	IRQ line if overridden on the command line.
62  *
63  * 3.  When included as a module, with arguments passed on the command line:
64  *         ncr_irq=xx	the interrupt
65  *         ncr_addr=xx  the port or base address (for port or memory
66  *              	mapped, resp.)
67  *         ncr_dma=xx	the DMA
68  *         ncr_5380=1	to set up for a NCR5380 board
69  *         ncr_53c400=1	to set up for a NCR53C400 board
70  *     e.g.
71  *     modprobe g_NCR5380 ncr_irq=5 ncr_addr=0x350 ncr_5380=1
72  *       for a port mapped NCR5380 board or
73  *     modprobe g_NCR5380 ncr_irq=255 ncr_addr=0xc8000 ncr_53c400=1
74  *       for a memory mapped NCR53C400 board with interrupts disabled.
75  *
76  * 255 should be specified for no or DMA interrupt, 254 to autoprobe for an
77  * 	IRQ line if overridden on the command line.
78  *
79  */
80 
81 /*
82  * $Log: generic_NCR5380.c,v $
83  */
84 
85 /* settings for DTC3181E card with only Mustek scanner attached */
86 #define USLEEP
87 #define USLEEP_POLL	1
88 #define USLEEP_SLEEP	20
89 #define USLEEP_WAITLONG	500
90 
91 #define AUTOPROBE_IRQ
92 #define AUTOSENSE
93 
94 
95 #ifdef CONFIG_SCSI_GENERIC_NCR53C400
96 #define NCR53C400_PSEUDO_DMA 1
97 #define PSEUDO_DMA
98 #define NCR53C400
99 #define NCR5380_STATS
100 #undef NCR5380_STAT_LIMIT
101 #endif
102 
103 #include <asm/system.h>
104 #include <asm/io.h>
105 #include <linux/signal.h>
106 #include <linux/blkdev.h>
107 #include "scsi.h"
108 #include <scsi/scsi_host.h>
109 #include "g_NCR5380.h"
110 #include "NCR5380.h"
111 #include <linux/stat.h>
112 #include <linux/init.h>
113 #include <linux/ioport.h>
114 #include <linux/isapnp.h>
115 #include <linux/delay.h>
116 #include <linux/interrupt.h>
117 
118 #define NCR_NOT_SET 0
119 static int ncr_irq = NCR_NOT_SET;
120 static int ncr_dma = NCR_NOT_SET;
121 static int ncr_addr = NCR_NOT_SET;
122 static int ncr_5380 = NCR_NOT_SET;
123 static int ncr_53c400 = NCR_NOT_SET;
124 static int ncr_53c400a = NCR_NOT_SET;
125 static int dtc_3181e = NCR_NOT_SET;
126 
127 static struct override {
128 	NCR5380_map_type NCR5380_map_name;
129 	int irq;
130 	int dma;
131 	int board;		/* Use NCR53c400, Ricoh, etc. extensions ? */
132 } overrides
133 #ifdef GENERIC_NCR5380_OVERRIDE
134 [] __initdata = GENERIC_NCR5380_OVERRIDE;
135 #else
136 [1] __initdata = { { 0,},};
137 #endif
138 
139 #define NO_OVERRIDES ARRAY_SIZE(overrides)
140 
141 #ifndef MODULE
142 
143 /**
144  *	internal_setup		-	handle lilo command string override
145  *	@board:	BOARD_* identifier for the board
146  *	@str: unused
147  *	@ints: numeric parameters
148  *
149  * 	Do LILO command line initialization of the overrides array. Display
150  *	errors when needed
151  *
152  *	Locks: none
153  */
154 
155 static void __init internal_setup(int board, char *str, int *ints)
156 {
157 	static int commandline_current = 0;
158 	switch (board) {
159 	case BOARD_NCR5380:
160 		if (ints[0] != 2 && ints[0] != 3) {
161 			printk(KERN_ERR "generic_NCR5380_setup : usage ncr5380=" STRVAL(NCR5380_map_name) ",irq,dma\n");
162 			return;
163 		}
164 		break;
165 	case BOARD_NCR53C400:
166 		if (ints[0] != 2) {
167 			printk(KERN_ERR "generic_NCR53C400_setup : usage ncr53c400=" STRVAL(NCR5380_map_name) ",irq\n");
168 			return;
169 		}
170 		break;
171 	case BOARD_NCR53C400A:
172 		if (ints[0] != 2) {
173 			printk(KERN_ERR "generic_NCR53C400A_setup : usage ncr53c400a=" STRVAL(NCR5380_map_name) ",irq\n");
174 			return;
175 		}
176 		break;
177 	case BOARD_DTC3181E:
178 		if (ints[0] != 2) {
179 			printk("generic_DTC3181E_setup : usage dtc3181e=" STRVAL(NCR5380_map_name) ",irq\n");
180 			return;
181 		}
182 		break;
183 	}
184 
185 	if (commandline_current < NO_OVERRIDES) {
186 		overrides[commandline_current].NCR5380_map_name = (NCR5380_map_type) ints[1];
187 		overrides[commandline_current].irq = ints[2];
188 		if (ints[0] == 3)
189 			overrides[commandline_current].dma = ints[3];
190 		else
191 			overrides[commandline_current].dma = DMA_NONE;
192 		overrides[commandline_current].board = board;
193 		++commandline_current;
194 	}
195 }
196 
197 
198 /**
199  * 	do_NCR53C80_setup		-	set up entry point
200  *	@str: unused
201  *
202  *	Setup function invoked at boot to parse the ncr5380= command
203  *	line.
204  */
205 
206 static int __init do_NCR5380_setup(char *str)
207 {
208 	int ints[10];
209 
210 	get_options(str, ARRAY_SIZE(ints), ints);
211 	internal_setup(BOARD_NCR5380, str, ints);
212 	return 1;
213 }
214 
215 /**
216  * 	do_NCR53C400_setup		-	set up entry point
217  *	@str: unused
218  *	@ints: integer parameters from kernel setup code
219  *
220  *	Setup function invoked at boot to parse the ncr53c400= command
221  *	line.
222  */
223 
224 static int __init do_NCR53C400_setup(char *str)
225 {
226 	int ints[10];
227 
228 	get_options(str, ARRAY_SIZE(ints), ints);
229 	internal_setup(BOARD_NCR53C400, str, ints);
230 	return 1;
231 }
232 
233 /**
234  * 	do_NCR53C400A_setup	-	set up entry point
235  *	@str: unused
236  *	@ints: integer parameters from kernel setup code
237  *
238  *	Setup function invoked at boot to parse the ncr53c400a= command
239  *	line.
240  */
241 
242 static int __init do_NCR53C400A_setup(char *str)
243 {
244 	int ints[10];
245 
246 	get_options(str, ARRAY_SIZE(ints), ints);
247 	internal_setup(BOARD_NCR53C400A, str, ints);
248 	return 1;
249 }
250 
251 /**
252  * 	do_DTC3181E_setup	-	set up entry point
253  *	@str: unused
254  *	@ints: integer parameters from kernel setup code
255  *
256  *	Setup function invoked at boot to parse the dtc3181e= command
257  *	line.
258  */
259 
260 static int __init do_DTC3181E_setup(char *str)
261 {
262 	int ints[10];
263 
264 	get_options(str, ARRAY_SIZE(ints), ints);
265 	internal_setup(BOARD_DTC3181E, str, ints);
266 	return 1;
267 }
268 
269 #endif
270 
271 /**
272  * 	generic_NCR5380_detect	-	look for NCR5380 controllers
273  *	@tpnt: the scsi template
274  *
275  *	Scan for the present of NCR5380, NCR53C400, NCR53C400A, DTC3181E
276  *	and DTC436(ISAPnP) controllers. If overrides have been set we use
277  *	them.
278  *
279  *	The caller supplied NCR5380_init function is invoked from here, before
280  *	the interrupt line is taken.
281  *
282  *	Locks: none
283  */
284 
285 int __init generic_NCR5380_detect(struct scsi_host_template * tpnt)
286 {
287 	static int current_override = 0;
288 	int count;
289 	unsigned int *ports;
290 #ifndef SCSI_G_NCR5380_MEM
291 	int i;
292 	unsigned long region_size = 16;
293 #endif
294 	static unsigned int __initdata ncr_53c400a_ports[] = {
295 		0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
296 	};
297 	static unsigned int __initdata dtc_3181e_ports[] = {
298 		0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
299 	};
300 	int flags = 0;
301 	struct Scsi_Host *instance;
302 #ifdef SCSI_G_NCR5380_MEM
303 	unsigned long base;
304 	void __iomem *iomem;
305 #endif
306 
307 	if (ncr_irq != NCR_NOT_SET)
308 		overrides[0].irq = ncr_irq;
309 	if (ncr_dma != NCR_NOT_SET)
310 		overrides[0].dma = ncr_dma;
311 	if (ncr_addr != NCR_NOT_SET)
312 		overrides[0].NCR5380_map_name = (NCR5380_map_type) ncr_addr;
313 	if (ncr_5380 != NCR_NOT_SET)
314 		overrides[0].board = BOARD_NCR5380;
315 	else if (ncr_53c400 != NCR_NOT_SET)
316 		overrides[0].board = BOARD_NCR53C400;
317 	else if (ncr_53c400a != NCR_NOT_SET)
318 		overrides[0].board = BOARD_NCR53C400A;
319 	else if (dtc_3181e != NCR_NOT_SET)
320 		overrides[0].board = BOARD_DTC3181E;
321 #ifndef SCSI_G_NCR5380_MEM
322 	if (!current_override && isapnp_present()) {
323 		struct pnp_dev *dev = NULL;
324 		count = 0;
325 		while ((dev = pnp_find_dev(NULL, ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e), dev))) {
326 			if (count >= NO_OVERRIDES)
327 				break;
328 			if (pnp_device_attach(dev) < 0)
329 				continue;
330 			if (pnp_activate_dev(dev) < 0) {
331 				printk(KERN_ERR "dtc436e probe: activate failed\n");
332 				pnp_device_detach(dev);
333 				continue;
334 			}
335 			if (!pnp_port_valid(dev, 0)) {
336 				printk(KERN_ERR "dtc436e probe: no valid port\n");
337 				pnp_device_detach(dev);
338 				continue;
339 			}
340 			if (pnp_irq_valid(dev, 0))
341 				overrides[count].irq = pnp_irq(dev, 0);
342 			else
343 				overrides[count].irq = SCSI_IRQ_NONE;
344 			if (pnp_dma_valid(dev, 0))
345 				overrides[count].dma = pnp_dma(dev, 0);
346 			else
347 				overrides[count].dma = DMA_NONE;
348 			overrides[count].NCR5380_map_name = (NCR5380_map_type) pnp_port_start(dev, 0);
349 			overrides[count].board = BOARD_DTC3181E;
350 			count++;
351 		}
352 	}
353 #endif
354 	tpnt->proc_name = "g_NCR5380";
355 
356 	for (count = 0; current_override < NO_OVERRIDES; ++current_override) {
357 		if (!(overrides[current_override].NCR5380_map_name))
358 			continue;
359 
360 		ports = NULL;
361 		switch (overrides[current_override].board) {
362 		case BOARD_NCR5380:
363 			flags = FLAG_NO_PSEUDO_DMA;
364 			break;
365 		case BOARD_NCR53C400:
366 			flags = FLAG_NCR53C400;
367 			break;
368 		case BOARD_NCR53C400A:
369 			flags = FLAG_NO_PSEUDO_DMA;
370 			ports = ncr_53c400a_ports;
371 			break;
372 		case BOARD_DTC3181E:
373 			flags = FLAG_NO_PSEUDO_DMA | FLAG_DTC3181E;
374 			ports = dtc_3181e_ports;
375 			break;
376 		}
377 
378 #ifndef SCSI_G_NCR5380_MEM
379 		if (ports) {
380 			/* wakeup sequence for the NCR53C400A and DTC3181E */
381 
382 			/* Disable the adapter and look for a free io port */
383 			outb(0x59, 0x779);
384 			outb(0xb9, 0x379);
385 			outb(0xc5, 0x379);
386 			outb(0xae, 0x379);
387 			outb(0xa6, 0x379);
388 			outb(0x00, 0x379);
389 
390 			if (overrides[current_override].NCR5380_map_name != PORT_AUTO)
391 				for (i = 0; ports[i]; i++) {
392 					if (!request_region(ports[i],  16, "ncr53c80"))
393 						continue;
394 					if (overrides[current_override].NCR5380_map_name == ports[i])
395 						break;
396 					release_region(ports[i], 16);
397 			} else
398 				for (i = 0; ports[i]; i++) {
399 					if (!request_region(ports[i],  16, "ncr53c80"))
400 						continue;
401 					if (inb(ports[i]) == 0xff)
402 						break;
403 					release_region(ports[i], 16);
404 				}
405 			if (ports[i]) {
406 				/* At this point we have our region reserved */
407 				outb(0x59, 0x779);
408 				outb(0xb9, 0x379);
409 				outb(0xc5, 0x379);
410 				outb(0xae, 0x379);
411 				outb(0xa6, 0x379);
412 				outb(0x80 | i, 0x379);	/* set io port to be used */
413 				outb(0xc0, ports[i] + 9);
414 				if (inb(ports[i] + 9) != 0x80)
415 					continue;
416 				else
417 					overrides[current_override].NCR5380_map_name = ports[i];
418 			} else
419 				continue;
420 		}
421 		else
422 		{
423 			/* Not a 53C400A style setup - just grab */
424 			if(!(request_region(overrides[current_override].NCR5380_map_name, NCR5380_region_size, "ncr5380")))
425 				continue;
426 			region_size = NCR5380_region_size;
427 		}
428 #else
429 		base = overrides[current_override].NCR5380_map_name;
430 		if (!request_mem_region(base, NCR5380_region_size, "ncr5380"))
431 			continue;
432 		iomem = ioremap(base, NCR5380_region_size);
433 		if (!iomem) {
434 			release_mem_region(base, NCR5380_region_size);
435 			continue;
436 		}
437 #endif
438 		instance = scsi_register(tpnt, sizeof(struct NCR5380_hostdata));
439 		if (instance == NULL) {
440 #ifndef SCSI_G_NCR5380_MEM
441 			release_region(overrides[current_override].NCR5380_map_name, region_size);
442 #else
443 			iounmap(iomem);
444 			release_mem_region(base, NCR5380_region_size);
445 #endif
446 			continue;
447 		}
448 
449 		instance->NCR5380_instance_name = overrides[current_override].NCR5380_map_name;
450 #ifndef SCSI_G_NCR5380_MEM
451 		instance->n_io_port = region_size;
452 #else
453 		((struct NCR5380_hostdata *)instance->hostdata)->iomem = iomem;
454 #endif
455 
456 		NCR5380_init(instance, flags);
457 
458 		if (overrides[current_override].irq != IRQ_AUTO)
459 			instance->irq = overrides[current_override].irq;
460 		else
461 			instance->irq = NCR5380_probe_irq(instance, 0xffff);
462 
463 		if (instance->irq != SCSI_IRQ_NONE)
464 			if (request_irq(instance->irq, generic_NCR5380_intr,
465 					IRQF_DISABLED, "NCR5380", instance)) {
466 				printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
467 				instance->irq = SCSI_IRQ_NONE;
468 			}
469 
470 		if (instance->irq == SCSI_IRQ_NONE) {
471 			printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
472 			printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
473 		}
474 
475 		printk(KERN_INFO "scsi%d : at " STRVAL(NCR5380_map_name) " 0x%x", instance->host_no, (unsigned int) instance->NCR5380_instance_name);
476 		if (instance->irq == SCSI_IRQ_NONE)
477 			printk(" interrupts disabled");
478 		else
479 			printk(" irq %d", instance->irq);
480 		printk(" options CAN_QUEUE=%d  CMD_PER_LUN=%d release=%d", CAN_QUEUE, CMD_PER_LUN, GENERIC_NCR5380_PUBLIC_RELEASE);
481 		NCR5380_print_options(instance);
482 		printk("\n");
483 
484 		++current_override;
485 		++count;
486 	}
487 	return count;
488 }
489 
490 /**
491  *	generic_NCR5380_info	-	reporting string
492  *	@host: NCR5380 to report on
493  *
494  *	Report driver information for the NCR5380
495  */
496 
497 const char *generic_NCR5380_info(struct Scsi_Host *host)
498 {
499 	static const char string[] = "Generic NCR5380/53C400 Driver";
500 	return string;
501 }
502 
503 /**
504  *	generic_NCR5380_release_resources	-	free resources
505  *	@instance: host adapter to clean up
506  *
507  *	Free the generic interface resources from this adapter.
508  *
509  *	Locks: none
510  */
511 
512 int generic_NCR5380_release_resources(struct Scsi_Host *instance)
513 {
514 	NCR5380_local_declare();
515 	NCR5380_setup(instance);
516 
517 	if (instance->irq != SCSI_IRQ_NONE)
518 		free_irq(instance->irq, instance);
519 	NCR5380_exit(instance);
520 
521 #ifndef SCSI_G_NCR5380_MEM
522 	release_region(instance->NCR5380_instance_name, instance->n_io_port);
523 #else
524 	iounmap(((struct NCR5380_hostdata *)instance->hostdata)->iomem);
525 	release_mem_region(instance->NCR5380_instance_name, NCR5380_region_size);
526 #endif
527 
528 
529 	return 0;
530 }
531 
532 #ifdef BIOSPARAM
533 /**
534  *	generic_NCR5380_biosparam
535  *	@disk: disk to compute geometry for
536  *	@dev: device identifier for this disk
537  *	@ip: sizes to fill in
538  *
539  *	Generates a BIOS / DOS compatible H-C-S mapping for the specified
540  *	device / size.
541  *
542  * 	XXX Most SCSI boards use this mapping, I could be incorrect.  Someone
543  *	using hard disks on a trantor should verify that this mapping
544  *	corresponds to that used by the BIOS / ASPI driver by running the linux
545  *	fdisk program and matching the H_C_S coordinates to what DOS uses.
546  *
547  *	Locks: none
548  */
549 
550 static int
551 generic_NCR5380_biosparam(struct scsi_device *sdev, struct block_device *bdev,
552 			  sector_t capacity, int *ip)
553 {
554 	ip[0] = 64;
555 	ip[1] = 32;
556 	ip[2] = capacity >> 11;
557 	return 0;
558 }
559 #endif
560 
561 #ifdef NCR53C400_PSEUDO_DMA
562 
563 /**
564  *	NCR5380_pread		-	pseudo DMA read
565  *	@instance: adapter to read from
566  *	@dst: buffer to read into
567  *	@len: buffer length
568  *
569  *	Perform a psuedo DMA mode read from an NCR53C400 or equivalent
570  *	controller
571  */
572 
573 static inline int NCR5380_pread(struct Scsi_Host *instance, unsigned char *dst, int len)
574 {
575 	int blocks = len / 128;
576 	int start = 0;
577 	int bl;
578 
579 	NCR5380_local_declare();
580 	NCR5380_setup(instance);
581 
582 	NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE | CSR_TRANS_DIR);
583 	NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
584 	while (1) {
585 		if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
586 			break;
587 		}
588 		if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
589 			printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
590 			return -1;
591 		}
592 		while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY);
593 
594 #ifndef SCSI_G_NCR5380_MEM
595 		{
596 			int i;
597 			for (i = 0; i < 128; i++)
598 				dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
599 		}
600 #else
601 		/* implies SCSI_G_NCR5380_MEM */
602 		memcpy_fromio(dst + start, iomem + NCR53C400_host_buffer, 128);
603 #endif
604 		start += 128;
605 		blocks--;
606 	}
607 
608 	if (blocks) {
609 		while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
610 		{
611 			// FIXME - no timeout
612 		}
613 
614 #ifndef SCSI_G_NCR5380_MEM
615 		{
616 			int i;
617 			for (i = 0; i < 128; i++)
618 				dst[start + i] = NCR5380_read(C400_HOST_BUFFER);
619 		}
620 #else
621 		/* implies SCSI_G_NCR5380_MEM */
622 		memcpy_fromio(dst + start, iomem + NCR53C400_host_buffer, 128);
623 #endif
624 		start += 128;
625 		blocks--;
626 	}
627 
628 	if (!(NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
629 		printk("53C400r: no 53C80 gated irq after transfer");
630 
631 #if 0
632 	/*
633 	 *	DON'T DO THIS - THEY NEVER ARRIVE!
634 	 */
635 	printk("53C400r: Waiting for 53C80 registers\n");
636 	while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG)
637 		;
638 #endif
639 	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
640 		printk(KERN_ERR "53C400r: no end dma signal\n");
641 
642 	NCR5380_write(MODE_REG, MR_BASE);
643 	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
644 	return 0;
645 }
646 
647 /**
648  *	NCR5380_write		-	pseudo DMA write
649  *	@instance: adapter to read from
650  *	@dst: buffer to read into
651  *	@len: buffer length
652  *
653  *	Perform a psuedo DMA mode read from an NCR53C400 or equivalent
654  *	controller
655  */
656 
657 static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src, int len)
658 {
659 	int blocks = len / 128;
660 	int start = 0;
661 	int bl;
662 	int i;
663 
664 	NCR5380_local_declare();
665 	NCR5380_setup(instance);
666 
667 	NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
668 	NCR5380_write(C400_BLOCK_COUNTER_REG, blocks);
669 	while (1) {
670 		if (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ) {
671 			printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
672 			return -1;
673 		}
674 
675 		if ((bl = NCR5380_read(C400_BLOCK_COUNTER_REG)) == 0) {
676 			break;
677 		}
678 		while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
679 			; // FIXME - timeout
680 #ifndef SCSI_G_NCR5380_MEM
681 		{
682 			for (i = 0; i < 128; i++)
683 				NCR5380_write(C400_HOST_BUFFER, src[start + i]);
684 		}
685 #else
686 		/* implies SCSI_G_NCR5380_MEM */
687 		memcpy_toio(iomem + NCR53C400_host_buffer, src + start, 128);
688 #endif
689 		start += 128;
690 		blocks--;
691 	}
692 	if (blocks) {
693 		while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_HOST_BUF_NOT_RDY)
694 			; // FIXME - no timeout
695 
696 #ifndef SCSI_G_NCR5380_MEM
697 		{
698 			for (i = 0; i < 128; i++)
699 				NCR5380_write(C400_HOST_BUFFER, src[start + i]);
700 		}
701 #else
702 		/* implies SCSI_G_NCR5380_MEM */
703 		memcpy_toio(iomem + NCR53C400_host_buffer, src + start, 128);
704 #endif
705 		start += 128;
706 		blocks--;
707 	}
708 
709 #if 0
710 	printk("53C400w: waiting for registers to be available\n");
711 	THEY NEVER DO ! while (NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_53C80_REG);
712 	printk("53C400w: Got em\n");
713 #endif
714 
715 	/* Let's wait for this instead - could be ugly */
716 	/* All documentation says to check for this. Maybe my hardware is too
717 	 * fast. Waiting for it seems to work fine! KLL
718 	 */
719 	while (!(i = NCR5380_read(C400_CONTROL_STATUS_REG) & CSR_GATED_53C80_IRQ))
720 		;	// FIXME - no timeout
721 
722 	/*
723 	 * I know. i is certainly != 0 here but the loop is new. See previous
724 	 * comment.
725 	 */
726 	if (i) {
727 		if (!((i = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_END_DMA_TRANSFER))
728 			printk(KERN_ERR "53C400w: No END OF DMA bit - WHOOPS! BASR=%0x\n", i);
729 	} else
730 		printk(KERN_ERR "53C400w: no 53C80 gated irq after transfer (last block)\n");
731 
732 #if 0
733 	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
734 		printk(KERN_ERR "53C400w: no end dma signal\n");
735 	}
736 #endif
737 	while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
738 		; 	// TIMEOUT
739 	return 0;
740 }
741 #endif				/* PSEUDO_DMA */
742 
743 /*
744  *	Include the NCR5380 core code that we build our driver around
745  */
746 
747 #include "NCR5380.c"
748 
749 #define PRINTP(x) len += sprintf(buffer+len, x)
750 #define ANDP ,
751 
752 static int sprint_opcode(char *buffer, int len, int opcode)
753 {
754 	int start = len;
755 	PRINTP("0x%02x " ANDP opcode);
756 	return len - start;
757 }
758 
759 static int sprint_command(char *buffer, int len, unsigned char *command)
760 {
761 	int i, s, start = len;
762 	len += sprint_opcode(buffer, len, command[0]);
763 	for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
764 		PRINTP("%02x " ANDP command[i]);
765 	PRINTP("\n");
766 	return len - start;
767 }
768 
769 /**
770  *	sprintf_Scsi_Cmnd	-	print a scsi command
771  *	@buffer: buffr to print into
772  *	@len: buffer length
773  *	@cmd: SCSI command block
774  *
775  *	Print out the target and command data in hex
776  */
777 
778 static int sprint_Scsi_Cmnd(char *buffer, int len, Scsi_Cmnd * cmd)
779 {
780 	int start = len;
781 	PRINTP("host number %d destination target %d, lun %d\n" ANDP cmd->device->host->host_no ANDP cmd->device->id ANDP cmd->device->lun);
782 	PRINTP("        command = ");
783 	len += sprint_command(buffer, len, cmd->cmnd);
784 	return len - start;
785 }
786 
787 /**
788  *	generic_NCR5380_proc_info	-	/proc for NCR5380 driver
789  *	@buffer: buffer to print into
790  *	@start: start position
791  *	@offset: offset into buffer
792  *	@len: length
793  *	@hostno: instance to affect
794  *	@inout: read/write
795  *
796  *	Provide the procfs information for the 5380 controller. We fill
797  *	this with useful debugging information including the commands
798  *	being executed, disconnected command queue and the statistical
799  *	data
800  *
801  *	Locks: global cli/lock for queue walk
802  */
803 
804 static int generic_NCR5380_proc_info(struct Scsi_Host *scsi_ptr, char *buffer, char **start, off_t offset, int length, int inout)
805 {
806 	int len = 0;
807 	NCR5380_local_declare();
808 	unsigned long flags;
809 	unsigned char status;
810 	int i;
811 	Scsi_Cmnd *ptr;
812 	struct NCR5380_hostdata *hostdata;
813 #ifdef NCR5380_STATS
814 	struct scsi_device *dev;
815 #endif
816 
817 	NCR5380_setup(scsi_ptr);
818 	hostdata = (struct NCR5380_hostdata *) scsi_ptr->hostdata;
819 
820 	spin_lock_irqsave(scsi_ptr->host_lock, flags);
821 	PRINTP("SCSI host number %d : %s\n" ANDP scsi_ptr->host_no ANDP scsi_ptr->hostt->name);
822 	PRINTP("Generic NCR5380 driver version %d\n" ANDP GENERIC_NCR5380_PUBLIC_RELEASE);
823 	PRINTP("NCR5380 core version %d\n" ANDP NCR5380_PUBLIC_RELEASE);
824 #ifdef NCR53C400
825 	PRINTP("NCR53C400 extension version %d\n" ANDP NCR53C400_PUBLIC_RELEASE);
826 	PRINTP("NCR53C400 card%s detected\n" ANDP(((struct NCR5380_hostdata *) scsi_ptr->hostdata)->flags & FLAG_NCR53C400) ? "" : " not");
827 # if NCR53C400_PSEUDO_DMA
828 	PRINTP("NCR53C400 pseudo DMA used\n");
829 # endif
830 #else
831 	PRINTP("NO NCR53C400 driver extensions\n");
832 #endif
833 	PRINTP("Using %s mapping at %s 0x%lx, " ANDP STRVAL(NCR5380_map_config) ANDP STRVAL(NCR5380_map_name) ANDP scsi_ptr->NCR5380_instance_name);
834 	if (scsi_ptr->irq == SCSI_IRQ_NONE)
835 		PRINTP("no interrupt\n");
836 	else
837 		PRINTP("on interrupt %d\n" ANDP scsi_ptr->irq);
838 
839 #ifdef NCR5380_STATS
840 	if (hostdata->connected || hostdata->issue_queue || hostdata->disconnected_queue)
841 		PRINTP("There are commands pending, transfer rates may be crud\n");
842 	if (hostdata->pendingr)
843 		PRINTP("  %d pending reads" ANDP hostdata->pendingr);
844 	if (hostdata->pendingw)
845 		PRINTP("  %d pending writes" ANDP hostdata->pendingw);
846 	if (hostdata->pendingr || hostdata->pendingw)
847 		PRINTP("\n");
848 	shost_for_each_device(dev, scsi_ptr) {
849 		unsigned long br = hostdata->bytes_read[dev->id];
850 		unsigned long bw = hostdata->bytes_write[dev->id];
851 		long tr = hostdata->time_read[dev->id] / HZ;
852 		long tw = hostdata->time_write[dev->id] / HZ;
853 
854 		PRINTP("  T:%d %s " ANDP dev->id ANDP scsi_device_type(dev->type));
855 		for (i = 0; i < 8; i++)
856 			if (dev->vendor[i] >= 0x20)
857 				*(buffer + (len++)) = dev->vendor[i];
858 		*(buffer + (len++)) = ' ';
859 		for (i = 0; i < 16; i++)
860 			if (dev->model[i] >= 0x20)
861 				*(buffer + (len++)) = dev->model[i];
862 		*(buffer + (len++)) = ' ';
863 		for (i = 0; i < 4; i++)
864 			if (dev->rev[i] >= 0x20)
865 				*(buffer + (len++)) = dev->rev[i];
866 		*(buffer + (len++)) = ' ';
867 
868 		PRINTP("\n%10ld kb read    in %5ld secs" ANDP br / 1024 ANDP tr);
869 		if (tr)
870 			PRINTP(" @ %5ld bps" ANDP br / tr);
871 
872 		PRINTP("\n%10ld kb written in %5ld secs" ANDP bw / 1024 ANDP tw);
873 		if (tw)
874 			PRINTP(" @ %5ld bps" ANDP bw / tw);
875 		PRINTP("\n");
876 	}
877 #endif
878 
879 	status = NCR5380_read(STATUS_REG);
880 	if (!(status & SR_REQ))
881 		PRINTP("REQ not asserted, phase unknown.\n");
882 	else {
883 		for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
884 		PRINTP("Phase %s\n" ANDP phases[i].name);
885 	}
886 
887 	if (!hostdata->connected) {
888 		PRINTP("No currently connected command\n");
889 	} else {
890 		len += sprint_Scsi_Cmnd(buffer, len, (Scsi_Cmnd *) hostdata->connected);
891 	}
892 
893 	PRINTP("issue_queue\n");
894 
895 	for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
896 		len += sprint_Scsi_Cmnd(buffer, len, ptr);
897 
898 	PRINTP("disconnected_queue\n");
899 
900 	for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
901 		len += sprint_Scsi_Cmnd(buffer, len, ptr);
902 
903 	*start = buffer + offset;
904 	len -= offset;
905 	if (len > length)
906 		len = length;
907 	spin_unlock_irqrestore(scsi_ptr->host_lock, flags);
908 	return len;
909 }
910 
911 #undef PRINTP
912 #undef ANDP
913 
914 static struct scsi_host_template driver_template = {
915 	.proc_info      	= generic_NCR5380_proc_info,
916 	.name           	= "Generic NCR5380/NCR53C400 Scsi Driver",
917 	.detect         	= generic_NCR5380_detect,
918 	.release        	= generic_NCR5380_release_resources,
919 	.info           	= generic_NCR5380_info,
920 	.queuecommand   	= generic_NCR5380_queue_command,
921 	.eh_abort_handler	= generic_NCR5380_abort,
922 	.eh_bus_reset_handler	= generic_NCR5380_bus_reset,
923 	.bios_param     	= NCR5380_BIOSPARAM,
924 	.can_queue      	= CAN_QUEUE,
925         .this_id        	= 7,
926         .sg_tablesize   	= SG_ALL,
927 	.cmd_per_lun    	= CMD_PER_LUN,
928         .use_clustering		= DISABLE_CLUSTERING,
929 };
930 #include <linux/module.h>
931 #include "scsi_module.c"
932 
933 module_param(ncr_irq, int, 0);
934 module_param(ncr_dma, int, 0);
935 module_param(ncr_addr, int, 0);
936 module_param(ncr_5380, int, 0);
937 module_param(ncr_53c400, int, 0);
938 module_param(ncr_53c400a, int, 0);
939 module_param(dtc_3181e, int, 0);
940 MODULE_LICENSE("GPL");
941 
942 #ifndef SCSI_G_NCR5380_MEM
943 static struct isapnp_device_id id_table[] __devinitdata = {
944 	{
945 	 ISAPNP_ANY_ID, ISAPNP_ANY_ID,
946 	 ISAPNP_VENDOR('D', 'T', 'C'), ISAPNP_FUNCTION(0x436e),
947 	 0},
948 	{0}
949 };
950 
951 MODULE_DEVICE_TABLE(isapnp, id_table);
952 #endif
953 
954 __setup("ncr5380=", do_NCR5380_setup);
955 __setup("ncr53c400=", do_NCR53C400_setup);
956 __setup("ncr53c400a=", do_NCR53C400A_setup);
957 __setup("dtc3181e=", do_DTC3181E_setup);
958